Hormonal induction of final maturation and ovulation in the sábalo, Prochilodus platensis Holmberg: Treatments, latency and incubation times and viability of ovules retained in the ovary after ovulation

Fortuny, Albert; Ros, A. Espinach; Amutio, V.G.

doi:10.1016/0044-8486(88)90070-1

Cited by 20 publications

(8 citation statements)

References 8 publications

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“…In cultured fish, water temperature affects the duration of latency, i.e. the time between hormone injection and ovulation/spawning 15,16 . In general, latency is negatively correlated with water temperature.…”

Section: Discussionmentioning

confidence: 99%

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Time course of final oocyte maturation and ovulation in chub mackerelScomber japonicusinduced by hCG and GnRHa

et al. 2008

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The question of whether the ovulation and spawning time in chub mackerel Scomber japonicus is entrained by a circadian rhythm was raised by our previous experiments. Further questions were also raised about whether the time course of human chorionic gonadotropin (hCG)-induced final oocyte maturation (FOM) and ovulation reflected the natural time course induced by endogeneous pituitary gonadotropin (GtH). To address these questions, hCG and gonadotropinreleasing hormone analog (GnRHa) were administered at two 'opposite' times, 14:00 and 02:00 hours, and the time courses of FOM and ovulation were compared. When hCG was injected, ovulation occurred 33 h post-injection in both groups, regardless of the timing of the hCG injection. The timing of ovulation in chub mackerel depends on the timing of hCG injection, but apparently not on circadian rhythms. When GnRHa was injected, ovulation began at 36 h post-injection of GnRHa, regardless of the timing of injection. These results indicate that the time course of FOM and ovulation in the chub mackerel followed a similar pattern whether stimulated by hCG injection or spontaneous luteinizing hormone (LH) surge because GnRHa induces the secretion of endogenous GtH (primarily LH) from the fish pituitary. Thus, it is concluded that the time course of hCG-induced FOM and ovulation in chub mackerel follows the natural time course induced by endogenous pituitary LH.

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Section: Discussionmentioning

confidence: 99%

“…the time between hormone injection and ovulation/spawning. 15,16 In general, latency is negatively correlated with water temperature. Our recent studies of ovulation induction by hCG in the Jack mackerel Trachurus japonicus also showed that hCG-induced ovulation needed 48 and 42 h at 15.7 and 17.0°C, respectively.…”

Section: Fisheries Sciencementioning

confidence: 99%

Time course of final oocyte maturation and ovulation in chub mackerelScomber japonicusinduced by hCG and GnRHa

et al. 2008

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“…Brood quality can be subjectively assessed based on external appearance (Carreon et al 1976;Woynarovich and Horvath 1980) and by ovarian biopsy where egg diameter and maturity are determined (Kerby 1986;Rottmann et al 1991). The quality of a fertilized egg is a reflection of many factors including brood nutrition, method of induced spawning, timing of egg collection, and fertilization practice used (Rottmann and Shireman 1979;Fortuny et al 1988;Koya et al 1994;Bruce et al 1999;Emata et al 2004). Postovulation egg quality of marine fish has been assessed based on the percentage of floating or sinking eggs (buoyancy), percent fertilization, percent hatch, larval survival, egg size, oil globule size and number, egg shape and clarity, blas-tomere morphology, lipid and fatty acid profiles, and the percentage of deformed larvae (Kjoervsik et al 1990;Brooks et al 1997).…”

mentioning

confidence: 99%

Induced Spawning and Egg Quality Evaluation of Red Snapper, Lutjanus campechanus

Bourque

Phelps

2007

J World Aquaculture Soc

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Brood red snapper, Lutjanus campechanus, were captured from the wild and induced to ovulate by human chorionic gonadotropin (hCG) injection; eggs and sperm were manually stripped; and the eggs were artificially fertilized. Eggs were evaluated by the following egg quality parameters: buoyancy, fertilization, egg size, and oil globule size and number. The relationship of these egg quality parameters and brood characteristics (female size, fecundity, time of year, and response time to ovulation) to 36 h posthatch larval survival was considered. Injection of wild‐caught red snapper females with 1100 IU/kg of hCG resulted in 75% of the females ovulating. The average fecundity was 343,377 ± 30,805 eggs/kg, with a mean percent fertilization of 79.0 ± 1.74%. The mean percentage of floating eggs per spawn was 91.8 ± 1.75%. Mean egg diameter for floating eggs was 778.3 ± 2.09 μm, with a mean oil globule diameter of 117.5 ± 1.53 μm. Brood‐related characteristics were a better predictor of larval survival than postovulation egg characteristics. The percentage of floating eggs in a spawn was not correlated to larval survival. Spawns with eggs having a single oil globule had a similar larval survival as those eggs where multiple globules were common. No clear relationships were found for any one factor and larval survival, but rather a combination of factors was more predictive of survival, most notably spawn date, fecundity, and response time following hCG injection.

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“…The appearance of female eggs before or after the moment of ovulation can result in low fertilization rates and low-quality larvae [17,18]. The exact time of ovulation in females may vary according to the species, with the largest time intervals observed for cold water fish such as trout Oncorhynchus mykiss (4 -6 days) [18] and Clupea harengus (14 days) [19] and smaller time intervals observed for subtropical and tropical fish as Carassius auratus (2 -3 hours) [20] and Prochilodus platensis (1 hour) [21]. Therefore, because the species evaluated in this study are neotropical, the period in which the eggs are viable may be assumed to be relatively short.…”

Section: Discussionmentioning

confidence: 99%

Artificial reproduction of neotropical fish: Extrusion or natural spawning?

Reynalte‐Tataje¹,

Lopes²,

Ávila-Simas³

et al. 2013

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In captive conditions, most neotropical migratory species do not have the necessary incentive to complete gonadal maturation and spawning, which require induction techniques, usually with the use of hormones. Numerous studies have therefore focused on finding an effective hormonal treatment to induce reproduction for each species. A standard treatment was successfully developed for most of these species, which consists of two doses of Carp Pituitary Extract (CPE), totaling 5.5 mgCPE/kg of fish. However, the best strategy for the subsequent fertilization of gametes is still unclear. This study was conducted with five species of commercial interest that do not reproduce naturally in captivity: pacu Piaractus mesopotamicus, piracanjuba Brycon orbignyanus, curimbatá Prochilodus lineatus, dourado Salminus brasiliensis and piau?u Leporinus macrocephalus. Ninety-nine broodstocks were used, consisting of males and females of the five species to compare two techniques for spawning and fertilization: extrusion followed by the dry method and natural spawning. All fish were induced with two hormone doses, i.e., 0.5 and 5.0 mgCPE/kg, and were subjected to one of the two types of fertilization. The results were compared using the fertilization rate, number of oocytes produced, relative fecundity and the broodstocks' survival rate on days following spawning. All species responded positively to spawning for extrusion, and only S. brasiliensis did not spawn through the natural spawning method. The natural spawning technique provided a higher fertilization rate of eggs and a greater broodstock survival rate (P < 0.05) for all species, except S. brasiliensis. It was concluded that the natural spawning technique can increase the production of viable eggs and reduce the mortality of species during breeding, except for S. brasiliensis.

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Hormonal induction of final maturation and ovulation in the sábalo, Prochilodus platensis Holmberg: Treatments, latency and incubation times and viability of ovules retained in the ovary after ovulation

Cited by 20 publications

References 8 publications

Time course of final oocyte maturation and ovulation in chub mackerelScomber japonicusinduced by hCG and GnRHa

Time course of final oocyte maturation and ovulation in chub mackerelScomber japonicusinduced by hCG and GnRHa

Induced Spawning and Egg Quality Evaluation of Red Snapper, Lutjanus campechanus

Artificial reproduction of neotropical fish: Extrusion or natural spawning?

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