Induced spawning of grey mullet (Mugil cephalus) by LHRH-a

Lee, C.S.; Tamaru, Clyde S.; Miyamoto, Garret; Kelley, Christopher

doi:10.1016/0044-8486(87)90175-x

Cited by 46 publications

(14 citation statements)

References 15 publications

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“…Mugilids have the ability to tolerate extreme conditions of temperature, salinity and dissolved oxygen (Nash & Shehadeh, 1980) and their whole life cycle can be controlled in captivity (Lee et al, 1987). They could therefore represent promising candidates for subacute and chronic toxicity tests.…”

Section: Introductionmentioning

confidence: 99%

“…Discoveries of liver lesions among marine teleost populations (Kranz & Peters, 1985;Krahn et al, 1986) indicate the need for the development of these fishes as models for toxicological studies since their hepatic alterations have been related to deteriorations of the aquatic environment. Mugilids have the ability to tolerate extreme conditions of temperature, salinity and dissolved oxygen (Nash & Shehadeh, 1980) and their whole life cycle can be controlled in captivity (Lee et al, 1987). They could therefore represent promising candidates for subacute and chronic toxicity tests.…”

Section: Introductionmentioning

confidence: 99%

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Fine structure of hepatocytes in juvenile grey mullets: Liza saliens Risso, L. ramada Risso and L. aurata Risso (Teleostei, Mugilidae)

Biagianti-Risbourg

1991

Journal of Fish Biology

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Livers of 45 fingerling grey mullets (Liza sp. 5-15 cm long) were subjected to light microscopy, transmission electron microscopy and enzyme cytochemical examination. The hepatic structure was found to be comparable in all three Liza species. As in other fish species, Liza liver parenchyma is arranged in cords (or dual-plated laminae, in sections parallel to the sinusoidal axis). Hepatocytes showed numerous microvilli in their perisinusoidal and canalicular areas. They contained a centrally located nucleus, fairly large areas of rough endoplasmic reticulum, consisting mainly of parallel cisternae, and pools of glycogen. A few small lipid droplets were evenly distributed in the cytoplasm. The Golgi fields, between the canaliculus and the nucleus, consist mainly of dictyosomes, lysosomes and autophagic vacuoles. Acid phosphatase activity was cytochemically localized to reaction products in secondary lysosomes and lipofuscin granules. A comparison between grey mullet liver and that of other teleosts was made.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fine structure of hepatocytes in juvenile grey mullets: Liza saliens Risso, L. ramada Risso and L. aurata Risso (Teleostei, Mugilidae)

Biagianti-Risbourg

1991

Journal of Fish Biology

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“…Despite the research carried out on the artificial propagation of mullet in captivity, farming still relies on the capture of juveniles from the sea (Lee and Tamaru 1988). Most investigations have concentrated on the induction of mullet spawning in natural conditions at the peak of their normal breeding season (Kulikova and Gnatchenko 1987; Lee et al 1987; Suzuki et al 1991). Because males reared in captivity fail to undergo final spermatozoa production (i.e.…”

Section: Introductionmentioning

confidence: 99%

Immunocytochemical studies of the gonadotropic cells in the pituitary gland of male mullet, Mugil cephalus, during the annual reproductive cycle in both natural habitat and captivity

Mousa

2000

J Appl Ichthyol

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Summary Using antiserum specific for the β subunit of coho salmon gonadotropic hormone II (GTH II), an immunocytochemical study of Mugil cephalus (L.) pituitaries was conducted during the annual reproductive cycle of the male in both natural habitat and captivity. The gonadotropic potency of the pituitary gland in general underwent an obvious increase during testicular development, reaching a peak at the time of reproductive maturity. During the testicular cycle of M. cephalus, the GTH cells showed an increase in immunoreactive staining intensity, granulation, hypertrophy and hyperplasia during sexual maturation. However, degranulation, vacuolization, and weakened immunoreactivity of these cells occurred during spawning. The GTH cells in the pituitary gland of M. cephalus males reared in captivity appeared with high synthetic and secretory activity but the reproductive activity declined, as reflected in the form of low values of the gonadosomatic index (GSI) and earlier resorption of the testes.

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“…Similar to greenback flounder, GnRHa (200 lg, ini) pellet implantation resulted in fewer ovulations and a smaller number of eggs ovulated compared to treatment with 100 lg of GnRHa (ini) and pellet implantation in this study (Poortenaar and Pankhurst 2000). Previous studies have shown that the optimal effective dose of GnRHa is species-specific: 1-5 lg in milkfish (Chanos chanos) (Tamaru et al 1988), 6.3-23.6 lg in black sea bass (Centropristis striata) (Berlinsky et al 2005), 70 lg in chum salmon (Oncorhynchus keta) , and 300-400 lg in gray mullet (Mugil cephalus) (Lee et al 1987). …”

Section: Discussionmentioning

confidence: 99%

“…In addition, GnRHa has now been successfully tested in a range of marine and freshwater species and has been shown to be effective in improving egg quantity and quality (Lee et al 1986(Lee et al , 1987Poortenaar and Pankhurst 2000;Zohar and Mylonas 2001;King and Pankhurst 2004). GnRHa is a principal stimulator of follicle-stimulating hormone and luteinizing hormone (LH) release in teleost fish.…”

Section: Introductionmentioning

confidence: 99%

Effect of exogenous hormones on ovulation and gonadal steroid plasma levels in starry flounder, Platichthys stellatus

Lim

2016

Aquacult Int

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The present study was designed to examine the potential for inducing ovulation in starry flounder (Platichthys stellatus) using gonadotropin-releasing hormone analog (GnRHa) and human chorionic gonadotropin (hCG) to assess whether starry flounder are differentially responsive to GnRHa and hCG. Female starry flounder were injected or implanted with different doses of hCG or GnRHa pellets to examine their ovulationinducing potential and effects on plasma levels of testosterone (T), 17b-estradiol (E2), and 17,20b-dihydroxy-4-pregnen-3-one (17,20bP). Blood samples were collected for up to 10 or 25 days post-injection or post-implantation in two separate experiments designed to mimic the early and middle stages of spawning, respectively. Fish treated with the GnRHa pellets (100 lg) showed a significant increase in the total number of stripped eggs relative to the controls. GnRHa administration had no effect on the floating rate or fertilization rate of ovulated eggs in the both experiments, whereas hCG injection affected both of these rates. Plasma T levels were not significantly different between the exogenous hormonetreated and control fish. In contrast, the plasma E2 level was elevated in those fish treated with GnRHa, regardless of injection or implantation, and was accompanied by increased numbers of stripped eggs in both experiments. Treatment with GnRHa resulted in higher 17,20bP levels compared to the controls, and there was a positive relationship between elevated plasma 17,20bP and an increase in ovulated eggs in response to GnRHa treatment. The implantation of starry flounder with GnRHa-containing pellets was effective at inducing sustained ovulation compared to hCG treatment.

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Induced spawning of grey mullet (Mugil cephalus) by LHRH-a

Cited by 46 publications

References 15 publications

Fine structure of hepatocytes in juvenile grey mullets: Liza saliens Risso, L. ramada Risso and L. aurata Risso (Teleostei, Mugilidae)

Fine structure of hepatocytes in juvenile grey mullets: Liza saliens Risso, L. ramada Risso and L. aurata Risso (Teleostei, Mugilidae)

Immunocytochemical studies of the gonadotropic cells in the pituitary gland of male mullet, Mugil cephalus, during the annual reproductive cycle in both natural habitat and captivity

Effect of exogenous hormones on ovulation and gonadal steroid plasma levels in starry flounder, Platichthys stellatus

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