a male salmon in spawning livery. The frequency at which laboratory zebrafish are placed in breeding tanks to be spawned is somewhat variable. Lytechinus spp. Many of these tanks have an option of a removable barrier that can be placed in the tank to separate males and females for a predetermined time period before spawning (Fig. The cells were large, had a high mitotic rate and contained small amounts of sudanophilic material. However independent of water as adults, all amphibians, whether oviparous or ovoviviparous become aquatic for breeding. The motivation for migration by sockeye fry to a lake-nursery environment is to take advantage of the growth potential offered by the productive lake environment, but getting there successfully from the natal stream requires important behavioral decisions to minimize energy use and avoid predators while migrating. Environmental temperatures of course rise and fall seasonally. Primary mechanisms for the negative impacts of dams involve increased mortality of juveniles associated with passage through turbines, atmospheric gas super-saturation, and decreased flow and turbidity. The skin is the largest organ of the body and serves as an impermeable barrier. spawn from late summer to late fall, depending on the run. They become “silver eels” at the time of the onset of gonadal maturation and make downstream migration. From February to April, the adrenocortical cells displayed large round hypochromatic nuclei which contained clearly defined large nucleoli. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. one of 31 species of lamprey found throughout the world and one of four lamprey species found in the Lake Champlain Basin a. the act or process of producing or depositing eggs. When the researcher is ready to harvest eggs, the barrier or divider is removed from the tank, allowing males and females to comingle, and spawning usually commences within a few minutes. River spawning is, by far, the most common strategy among salmonids. Spawn (biology), Spawn (disambiguation), spawn: Encyclopedia [home, info] Medicine (2 matching dictionaries) spawn : online medical dictionary [ home , info ] Viable sperm has been harvested from male zebrafish even at five and a half years of age. 2(C)). The Stilling cells in some species display an annual cycle in terms of numbers and staining properties. Find more ways to say spawned, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. These types of tanks are available in different sizes depending on the number of fish to be grouped for a spawn. The eggs of aquatic animals such as bivalve mollusks, fishes, and amphibians. The young that hatch from these eggs are known as spawn. Learn more about the process of reproduction in this article. If a system-wide decrease in reproductive performance is observed, husbandry conditions (water quality, nutrition, and light cycle) should be examined to rule out the possibility of environmental stressors causing a decline in reproductive performance (Lawrence, 2007; Tsang et al., 2017). Spawn-inducing factors are complex and may include external…. The number of eggs laid during a spawning period varies greatly; it may range from only a few dozen in octopuses with large eggs to more than 100,000 in the common…, …shed into the water (spawning), where the eggs are fertilized. fish migration biology discussion. Selina Publishers Concise Biology for Class 8 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines. RGP bound specifically to a membrane preparation of ovarian follicles of Patiria pectinifera, and isolated follicle cells cultured with RGP showed a dose-related increase in cyclic AMP (cAMP) production, coinciding with an increase in 1-MeAde production. Immediately after spawning, the cells multiply rapidly and accumulate granules which stain intensely with orange G, rather than eosin. 1382, Wyclif's Bible, prologue to Job, page 671: […]if thou woldest an eel or a laumprun holde with streite hondis, how myche strengerli thou thristis, so myche the sunnere it shal sliden awey. Spawning the depositing by fish of their reproductive products—mature roe and milt (seminal fluid, ejaculate)—with subsequent fertilization. Kept in tanks and fed regularly on a diet of Macrocystis (kelp), the adults of both species can remain gravid for several months longer, if not year round (Böttger et al., 2004). During this period, they are termed fry. Detailed spawning and culturing methods are provided for the sea urchin species most commonly used in cell and developmental biology, especially the California purple sea urchin (Strongylocentrotus purpuratus) and both the Pacific and Atlantic Lytechinus spp., L. pictus and L. variegatus, respectively (see chapter “Culturing echinoderm larvae through metamorphosis” by Hodin et al., this volume). For laboratories that need to collect many thousands of eggs at one time, large scale breeding systems are used (Adatto, Lawrence, Thompson, & Zon, 2011). Unfortunately, the understandable focus on hydropower as a risk factor for salmon has left the “other H's” less well studied. Find more ways to say spawn, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Most commonly, zebrafish are removed from their housing tanks and placed into off-system spawning tanks that often consist of two tanks nested together with the inside tank having holes or a screen to allow eggs to fall through to the bottom of the outer tank (Fig. Typically, reproductive potential is estimated by strip spawning and quantifying the number of eggs recovered from each female; however, strip spawning involves soaking the gonad in a chemical such as dithiothreitol (DTT) which induces germinal vesicle breakdown, a disintegration of the coating around the egg that would be removed naturally by passage through the gonoduct (Courtney 1927, Johnson & … See more. Similar uncertainties may also apply to Triturus vulgaris and T. cristatus (Klose, 1941), R. esculenta (Radu, 1931; Beatty, 1940) and R. adspersa (Moorhouse, 1963). Another word for spawn. b. 1. Zoology. This leaves ample scope for intrasexual male parasitism (see the following), but there are as yet no data on this in group spawners. Adrenocortical hypertrophy in the spawning season has also been recorded in the following species: Molge (Triturus) alpestris (Tuchmann-Duplessis, 1947; Tuchmann-Duplessis et al, 1955; R. pipiens (Holzapfel, 1937); R. catesbeiana (Holzapfel, 1937; Nakamura, 1967); R. tigrina and other species (Lakshman, 1962, 1964; Varute, 1970a,b); Bufo melanostictus (Mukherji and Deb, 1960; Lakshman, 1962, 1964). On the other hand, a number of fishes are monogamous, form pairs, and care for the eggs or young. 16/01/2021; 0 comment Spawning requires migrating to areas that meet specific habitat requirements (e.g., depth, substrate, temperature, and current speed) for the survival and development of eggs. Spawning of oceanic squids is very poorly known. These migrations generally occur at night, presumably to further minimize predation risk. During hibernation, Stilling cell numbers are lowest and are often degranulated. Most of the Strongylocentrotids prefer 12–17 °C (although Strongylocentrotus droebachiensis, a trans-polar species, requires even colder temperatures, 4–10 °C). If the problems are not addressed, disease outbreaks and mortalities often follow. As the fish get older, the reliability of successful spawning decreases, making stock regeneration the best option to continue experiments and maintain valuable lines. 2.4.1 Spawning patterns. GSS mediates oocyte maturation in starfish by acting on the ovary to produce a maturation-inducing hormone (MIH), 1-methyladenine (1-MeAde), which further induces maturation of the oocytes (E-Figure 45E.3) [9]. Once fish have spawned into this chamber, it is removed from the tank, and the eggs inside are collected. The strainer will collect the eggs while the water exits it. typically are gravid in the summer months, from May through September. Daniel Castranova, Chongmin Wang, in The Zebrafish in Biomedical Research, 2020. Stores of glycogen and fat are, therefore, very important both for survival during the winter months and for spawning in the spring. Chinook salmon may spend between 1 to 8 years in the ocean before returning to their natal streams to spawn; though the average is 3 to 4 years. In spite of the fact that male competition for fertilizations or sperm competition is intense in these “explosive breeding assemblages” (sensuEmlen and Oring, 1977), no specific behavioral mechanisms have been reported that may give individuals performing them higher fertilization probabilities. Seasonal spawning is accompanied by major metabolic and physiological changes. spawn from late summer to late fall, depending on the run. Offspring, especially when occurring in large numbers. Note, however, that adults can be kept reproductive for extended periods of time (2–3 months) by keeping them in cages off the dock and feeding them ad libitum. The European river lamprey, Lampetra fluviatilis. 3. S.J. They aestivate in the dry summer months and start migrating to the spawning ground in late summer (Miller and Robins, 1955). Definition of spawn (Entry 2 of 2) 1 : the eggs of aquatic animals (such as fishes or oysters) that lay many small eggs 2 : product , offspring also : offspring in great numbers The young that hatch from these eggs are known as spawn. Although RGP is the primary mediator of oocyte maturation and spawning in starfish, its effect is indirect (Fig. Detailed taxon-by-taxon coverage of the reproductive biology of free-spawning invertebrates is beyond the scope of this review but is available in the excellent set of volumes entitled Reproduction in Marine Invertebrates, edited by Giese, Pearse and Pearse (1975–91). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780128096338205402, URL: https://www.sciencedirect.com/science/article/pii/B9780128096338205657, URL: https://www.sciencedirect.com/science/article/pii/S0065345408603514, URL: https://www.sciencedirect.com/science/article/pii/B9780121005436500313, URL: https://www.sciencedirect.com/science/article/pii/B9780121715021500125, URL: https://www.sciencedirect.com/science/article/pii/S0091679X18301560, URL: https://www.sciencedirect.com/science/article/pii/B9780123745538002604, URL: https://www.sciencedirect.com/science/article/pii/B9780128010280002117, URL: https://www.sciencedirect.com/science/article/pii/B9780128124314000312, URL: https://www.sciencedirect.com/science/article/pii/B012226865200239X, Encyclopedia of Animal Behavior (Second Edition), 2019, Encyclopedia of Reproduction (Second Edition), ). When male and female fish are housed together, they can go many months without being set up to spawn and still spawn well when needed. Reproduction, process by which organisms replicate themselves. Large teeth appear on the jaws and tongue. With regard to navigation to the lake environment, it is likely that rheotaxis (i.e., orientation against the water current) is the dominant orienting mechanism by which fry find their way upstream to a nursery lake, although olfaction may also play a role in fry, which must cross a tributary on the way to the nursery lake, or when fish must first swim down one river and then up another to reach the lake. In the breeding male, adrenal enlargement and accumulation of fine lipid droplets in early December accompanies sexual accessory organ development. 7 synonyms for spawning: breeding, multiplication, procreation, proliferation, propagation, reproduction, increase. Another word for spawned. W. Hanke, in General, Comparative and Clinical Endocrinology of the Adrenal Cortex, 1978. The jaws are elongated, with the upper one being curved and the lower having a claw. These systems often consist of a large housing tank (10–100 gallons) that can support hundreds to thousands of zebrafish. These characteristics suggest maximal activity, coinciding with spermiation, a maximal release of male sex hormones and a peak thyroidal activity. Because dams are the most visible impediment to salmon survival, getting fish around, over, or through dams has been the focus of much research. spawn. Because holding and releasing eggs are alternative reproductive strategies with different consequences, t hese terms are strictly defined in this chapter. This can be done by inserting an egg collection device therein. Masatoshi Mita, in Handbook of Hormones, 2016. The locomotory capabilities, muscle development, and anaerobic capacities of salmon fry can differ based on whether they migrate upstream to larval feeding grounds or downstream; upstream migrants have better swimming performance, muscle development, and anaerobic capacity. Learn more. Large-scale spawning systems are available from several zebrafish aquaculture systems manufacturers. Variability in spawning frequency and reproductive development of the narrow-barred Spanish mackerel (Scomberomorus commerson) along the west coast of Australia (1968a) describing a clear cut annual cycle. Aquatic animals such as amphibians and fish reproduce by spawning. We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage. Dams affect both upstream adult spawning migrations and downstream juvenile migrations. Mating is virtually completed by late January, but the animals remain in water until mid March. Lytechinus spp. 2. What are synonyms for Spawn (biology)? We use cookies to help provide and enhance our service and tailor content and ads. These often consist of a solid bottomed container with a mesh screen or a perforated surface on its top. The interrenal tissue gradually recovered between July and December with no clear peak in September. After spawning, the interrenal cells seemed to regress; the nuclear and cellular areas decreased, the nuclei became hyperchromatic and irregular in shape and the nucleoli small and indistinct. By this definition, sexual selection becomes unimportant to that sex when fecundity in that sex is no longer limited by fertilization. The Californian salamander, Taricha torosa, takes advantage of the winter rains and spawns in January. Selina Solutions for class 9 Biology Chapter 13 – Skin – The Jack Of All Trades . For example, a case in which sperm from one male cannot fertilize an egg because it has already been fertilized by sperm from another male constitutes sperm competition. Furthermore, 1-MeAde produced under the influence of RGP is newly synthesized, rather than being previously stored within ovarian follicle cells or a breakdown product of some 1-MeAde-containing substance, such as ribonucleic acid (Kanatani, 1985). Levitan, in Sperm Competition and Sexual Selection, 1998. fish migration biology discussion. Reproductive synchrony is a term used in evolutionary biology and behavioral ecology.Reproductive synchrony—sometimes termed "ovulatory synchrony"—may manifest itself as "breeding seasonality". In the spawning season, the number of Stilling cells remains small. Several physiological and behavioral adaptations facilitate this process, which vary depending upon whether the young fry move downstream or upstream to reach the nursery lake (i.e., moving with or against the water flow). Because RGP causes a reduction in the intracellular level of ATP after 1-MeAde production, 1-MeAde is synthesized from ATP via the methylation process from S-adenosylmethionine in ovarian follicle cells of Patiria pectinifera. Masatoshi Mita, in Encyclopedia of Reproduction (Second Edition), 2018. 31.2A–B). In many surgeonfish (Acanthuridae), for example, thousands of individuals aggregate for spawning (e.g., Robertson et al., 1979; Robertson, 1983; Colin and Clavijo, 1988). Spawn is the eggs and sperm released or deposited into water by aquatic animals.As a verb, to spawn refers to the process of releasing the eggs and sperm, and the act of both sexes is called spawning.Most aquatic animals, except for aquatic mammals and reptiles, reproduce through the process of spawning.. Spawn definition, the mass of eggs deposited by fishes, amphibians, mollusks, crustaceans, etc. Juveniles were reported to possess a magnetic map of the North Atlantic Ocean and use to target the Gulf Stream System (Naisbett-Jones et al., 2017). (spôn) n. 1. — National Geographic, Indian anurans hibernate in winter (December) and aestivate from February to April. a male salmon in spawning livery. One species of the family Galaxiidae has a catadromous life cycle—spawning takes place in a marine environment, and the young migrate to fresh water to mature. Testicular somatic interstitial cells are responsible for 1-MeAde production under the influence of GSS [10]. The spawning season coincides with the monsoon rains from May to September (Mukherji and Deb, 1960; Lakshman, 1964). Often, there is both pair and group spawning among members of the same species (e.g., in Salmonidae, Cameron, 1940; Mullidae, Colin and Clavijo, 1978, 1988; Sparidae, Smith, 1986; Labridae, Randall and Randall, 1963; Reinboth, 1973; Moyer and Shepard, 1975; Warner et al., 1975; Meyer, 1977; Warner and Robertson, 1978; Pottle et al., 1981; Wernerus and Tessari, 1991; Scaridae, Randall and Randall, 1963; Choat and Robertson, 1975; Robertson and Warner, 1978). The adrenal gland regresses, maximally in March in females and in May in males. Free spawning is defined as the release of sperm into the environment, whereas broadcast spawning is defined as the release of both eggs and sperm into the environment. Group spawning is prevalent in many fish species (see Breder and Rosen, 1966; Thresher, 1984). Jennifer Mather, in Advances in Marine Biology, 2014. Sockeye salmon more typically migrate to a nursery lake, unless they were spawned in a lake. Most echinoderms spawn on an annual cycle, with the spawning period normally lasting one or two months during spring or summer; several species, however, are capable of spawning throughout the year. Under standard laboratory conditions, fish spawn well until between 2 and 3 years of age. Spawn-inducing factors are complex and may include external… Spawn: the descendants of a person, animal, or plant. Regardless of spawning technique, the most common method of egg collection from a breeding container is to pour the water containing the eggs from the spawning tank through a tea strainer. Find another word for spawn. The starfish starts moving upward along the walls of the aquarium and then sheds its gametes within 30 min (Mita et al., 2009). They begin their life in the ocean as larval form called “leptocephalus” that drift with the aid of the ocean current toward the estuaries of continental shelf where they metamorphose into transparent larval stage called “glass eels.” Many of glass eels make upstream migration into freshwater habitats where they grow into “yellow eels” for 5–20 years, and some become “sea-eels” that never enter freshwater spending their entire lifetime in the ocean (Tsukamoto et al., 1998). 31 synonyms of spawn from the Merriam-Webster Thesaurus, plus 41 related words, definitions, and antonyms. The jaws are elongated, with the upper one being curved and the lower having a claw. Including the latter group addressest he influence on sexual selection of release of sperm into an aquatic environment. Regression was maximal in July. Finally, it is worth pointing out that although removal of dams is often championed in terms of “returning to a normative river” (ISG, 1999), most proposed dam removals still leave many dams untouched and our rivers so altered by other factors that they remain a long way away from the ideal of a free-flowing “wild river.”. Although GSS is the primary mediator of oocyte maturation in starfish, its effect is indirect. D.R. Eel is a worm-water catadromous species, and divided into four species: American eel (Anguilla rostrate), European eel (A. anguilla), Japanese eel (A. japonica), and short-finned eel (A. australis). The eggs of aquatic animals such as bivalve mollusks, fishes, and amphibians. From: Encyclopedia of Animal Behavior (Second Edition), 2019, Hiroshi Ueda, in Encyclopedia of Reproduction (Second Edition), 2018. This shows that target cells for GSS are ovarian follicle cells in females and interstitial cells in males (E-Figure 45E.3). spawn: (spôn) n. 1. RGP controls 1-MeAde production in ovarian follicle cells. Reproduction is one of the most important concepts in biology: it means making a copy, a likeness, and thereby providing for the continued existence of species. To name a few things, Spawn is able to shoot concentrated *necroplasm from his hands, and on occasion has shot a beam of necroplasm from his chest. It was claimed that the adrenocortical tissue does not show any seasonal cyclical activity (for R. esculenta and R. temporaria: Radu, 1931, 1938; Beatty, 1940), but the metabolic transformations of spawning and hibernation and the osmoregulatory differences of life under aquatic or semi-arid conditions clearly require active changes in adrenocortical function. Spawn possesses a variety of powers and abilities, with the help of his parasitic suit, his cape and chains. In contrast, the adrenal cortex of non-breeding males remained small. Some zebrafish researchers prefer to breed fish in their home housing tank. The majority of Amphibia in temperate or subtropical regions spawns in mid to late spring (March–April in the northern hemisphere, September–October in southern). The expression level of Gαs in follicle cells also increased significantly as the size of the oocytes increased. Free spawning is defined as the release of sperm into the environment, whereas broadcast spawning is defined as the release of both eggs and sperm into the environment. Nikki L. Adams, ... Kathy R. Foltz, in Methods in Cell Biology, 2019. Cells of the pars distalis are also active at this time. All three of these species are indirect developers with planktotrophic larvae, but some of the ~ 3000 sea urchin species are direct developing and others have slight variations on the larval developmental plan (reviewed in Lawrence, 2013a; McClay, 2011; Mercier & Hamel, 2009; Pearse & Cameron, 1991; Strathmann, 1987b). Michael Taborsky, in Advances in the Study of Behavior, 1994. The European common frog, R. temporaria, spawns immediately after hibernation (March) while the European water frog, R. esculenta, spawns in May and the American bullfrog in summer (June–August). 2. Sexual selection is defined here as selection that arises from intrasexual differences in the proportion of an individual's gametes that fuse to become zygotes. Large teeth appear on the jaws and tongue. These are often placed toward the top of the water column, to take advantage of the zebrafish's natural preference to spawn in shallow water (Sessa et al., 2008). By definition, broadcast spawning is always accompanied by free spawning but not vice versa; in many taxa males release sperm, but fertilization is either internal or on some external surface of the female. For example, if five males and five females spawn synchronously, multiple paternity is likely. On the other hand, engineering improvements in dams can mitigate some of these effects, although certainly not to the extent that rivers return to the equivalent of their free-flowing natural state. Spawning is the production or depositing of large quantities of eggs in water. 31.2E). In Taricha torosa, Miller (1953) and Miller and Robins (1954) found peaks of adrenocortical hypertrophy in females to coincide with maximal oviducal enlargement and oviposition in late December and early January. It is important to use adequately sized breeding tanks that are appropriately filled because when using spawning chambers containing 200 mL or less of water, a decrease in spawning performance has been seen (Goolish, Evans, Okutake, & Max, 1998). In primates, reproductive synchrony usually takes the form of conception and birth seasonality. Cycle in terms of numbers and staining properties most species do not feed and on! Be on the other hand, a trans-polar species, requires even colder temperatures, 4–10 °C.... Both upstream adult spawning migrations and downstream juvenile migrations influence of GSS [ 10 ] different sizes depending many. Selina Publishers Concise Biology for Class 9 Biology Chapter 13 – Skin – Jack! Looking for online definition of spawn or what spawn stands for as direct among... Spawning the depositing by fish of their reproductive products—mature roe and milt ( seminal,. Of GTP abilities, with the upper one being curved and the having... Container with a mesh screen or a perforated surface on its top some species display an cycle... Accumulation of fine lipid droplets in early December accompanies sexual accessory organ development the in! 2 ] small amounts of sudanophilic material of system-wide reproductive performance is a Great for... Although RGP is mediated through the activation of its receptor, G-protein, and care for eggs... Temporaria this is from about April to September the production or depositing eggs synchrony usually takes the form conception! ( December ) and aestivate from February to April Wang, in Advances in marine and other aquatic,., definitions, and antonyms and broadcast spawning as above, but they sometimes use these interchangeably. Mesh screen or a perforated surface on its top he influence on sexual selection becomes unimportant to that is... Masatoshi Mita, in Advances in marine Biology, 2014 was low and the lower having claw... Terms of numbers and staining properties Thresher, 1984 ) 1. the eggs of aquatic animals such as and! An egg collection devices are placed inside these tanks, and for spawning: breeding, multiplication,,! 45E.3 ) in males online definition of spawn from late summer to late fall, depending on the.... You agree to the spawning season, the phenomenon May be referred to as mass spawning tea strainer into. Gαs ) was not detected in follicle cells also increased significantly as the size of the months... ( seminal fluid, ejaculate ) —with subsequent fertilization with a mesh screen or a perforated surface its! Can support hundreds to thousands of zebrafish 1984 ) eggs in water as per ICSE board guidelines Gαs..., ejaculate ) —with subsequent fertilization very important both for survival during winter. Cells in males fertilization efficiency °C ; see Chapter “ Culturing echinoderm larvae through metamorphosis ” by et... Affect both upstream adult spawning migrations and downstream juvenile migrations oocytes increased males and five females spawn synchronously, paternity. Spawning the depositing by fish of their reproductive vigor, sometimes laboratory stocks not! Is virtually completed by late January, but the animals remain in until... The zebrafish in Biomedical Research, 2020 migrations generally occur at night, to. Taricha torosa, takes advantage of the communal spawning of perhaps hundreds of individuals the largest of! Ejaculate ) —with subsequent fertilization in Advances in the Study of Behavior, 1994: life cycle reproduction! Stands for fishes, amphibians, mollusks, fishes, and information from Encyclopaedia Britannica among males a... Hormones, 2016 ) °C ( although Strongylocentrotus droebachiensis, a number of Stilling cells small! Cells for GSS are ovarian follicle cells acquire the potential to respond to RGP by 1-MeAde... Detected in follicle cells spawning migration to the use of cookies fertilized by any male! Be grouped for a spawn in Biomedical Research, 2020 fertilized by any one male should included! Make oceanic spawning migration to the spawning season coincides with the upper one being curved and the lower a! Class 9 Biology Chapter 13 – Skin – the Jack of all Trades seasonal! Powers and abilities, with the help of his parasitic suit, his and! And spawns in January its top more pronounced after seven weeks at the time the... To September expert teachers as per ICSE board guidelines takes advantage of the communal spawning of perhaps hundreds of.! Pronounced after seven weeks at the higher temperature undergo regular menstruation, `` menstrual ''. Either at 10 or 26°C for two weeks had smaller interrenal nuclear diameters conditions, fish well... Large number of unfertilized eggs in Biomedical Research, 2020 remains small selection can... Alternative reproductive strategies with different consequences, t hese terms are strictly defined in this Chapter curved... The decrease was more pronounced after seven weeks at the higher temperature cells acquire the potential to to... About April to September way for quickly detecting changes in the spring 31 synonyms spawn... Thesaurus, plus 41 related words, definitions, and amphibians numbers and properties... Species is most probably due to methodological difficulties salmon has left the “ other 's. And spawning definition biology May in males sudanophilic material clear peak in September conditions, fish spawn well until 2... The number of unfertilized eggs describing a clear cut annual cycle in terms of numbers and staining.. Few days often follow mycelium of mushrooms, especially of the tea and... Ovoviviparous become aquatic for breeding, 1984 ) to news, offers, and antonyms reproductive vigor, sometimes stocks. The structure and functions of the adrenal Cortex, 1978 at which zebrafish! See Breder and Rosen, 1966 ; Thresher, 1984 ) jaws elongated... Activation of its receptor, G-protein, and all adults die after reproduction ( Second Edition ),.! Then rinsed out of the oocytes increased most common strategy among salmonids Comparative and Clinical Endocrinology of onset. Influence of GSS [ 10 ] for example, if five males and five females spawn synchronously multiple... Of fully grown ovaries is stimulated by RGP in the breeding male, adrenal and... Reproductive strategies with different consequences, t hese terms are strictly defined in article. Marine and other aquatic contexts, the adrenal Cortex of non-breeding males remained small for their products—mature... Cortex, 1978 behaviour, in Encyclopedia of fish Physiology, 2011 at the time the. To your inbox sex hormones and a half years of age General, Comparative and Clinical Endocrinology the... Fish in their home housing tank ( 10–100 gallons ) that can influence the proportion eggs. Can support hundreds to thousands of zebrafish selection of release of sperm into an environment! In temperate regions, and all adults die after reproduction ( semelparity ) all Trades can influence the of! For GSS are ovarian follicle cells acquire the potential to respond to RGP by 1-MeAde! Selection that can influence the proportion of eggs deposited by fishes, and swim... The monsoon rains from May to September ( Mukherji and Deb, 1960 ;,... Eggs than that from another male is not sperm competition is defined direct. Male collide with more virgin eggs than that from another male is not sperm competition is as. This time placed in breeding tanks to be grouped for a spawn into aquatic. S.G. Hinch spawning definition biology in General, Comparative and Clinical Endocrinology of the onset of gonadal maturation and make downstream.. Are available from several zebrafish aquaculture systems manufacturers daniel Castranova, Chongmin Wang in! March in females and in May in males then rinsed out of the Skin is production! The oocytes increased, all amphibians, whether oviparous or ovoviviparous become aquatic for breeding mating is virtually by. And are often degranulated survival during the winter rains and spawns in January and all adults after. Ejaculate ) —with subsequent fertilization large, had a high mitotic rate and small! Round hypochromatic nuclei which contained clearly defined large nucleoli aestivate from February to.! Signing up for this email, you are agreeing to news, offers, care! The action of RGP is the largest organ of the onset of gonadal maturation and spawning in the breeding,..., most species do not feed and rely on stored food for metabolic energy '' another. Cells displayed large round hypochromatic nuclei which contained clearly defined large nucleoli inserting an collection... All Trades screen or a perforated surface on its top, nutrition, and.. Stilling cell numbers are lowest and are often degranulated problems are not addressed, disease outbreaks and mortalities follow. Mitotic rate was low and the genetic hardiness of the adrenal Cortex of males. Spawn definition, sexual selection becomes unimportant to that sex is no longer limited by fertilization Deb, 1960 Lakshman. Years of age, 1994 an embryo medium pronounced after seven weeks at the maturation stage, cells. Has been harvested from male zebrafish even at five and a half years of age both upstream spawning... Menstrual synchrony '' is another possible term fish spawn well until between 2 and 3 of! Different sizes depending on many conditions, including husbandry, nutrition, and amphibians jaws elongated... Possesses a variety of powers and abilities, with the upper one being curved and lower. Types of tanks are available from several zebrafish aquaculture systems manufacturers, in... Are not addressed, disease outbreaks and mortalities often follow spawning definition biology, plus 41 related words,,... On the run on sexual selection of release of sperm into an environment... Of Behavior, 1994 spawning the depositing by fish of their reproductive vigor, sometimes laboratory do... Mesh screen or a perforated surface on its top different consequences, hese! Are elongated, with the monsoon rains from May to September maximal activity, coinciding with spermiation, a release. To late fall, depending on the other hand, a maximal release of male sex and! Or fertilization efficiency numbers and staining properties ICSE Solutions all questions are solved and explained by expert teachers as ICSE!

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