Induced sex change, spawning and larviculture of potato grouper, Epinephelus tukula

Yeh, Shinn-Lih; Dai, Quen-Chai; Chu, Yeong-Torng; Kuo, Chun-Yi; Ting, Yun-Yuan; Chang, Ching‐Fong

doi:10.1016/s0044-8486(03)00316-8

Cited by 32 publications

(20 citation statements)

References 13 publications

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“…Yeh et al (2003a) obtained 66.7% sex-changed males after a 70-day implantation in E. tukula, which was lower than rates for E. fario and E. salmonoides (87-100%; Yeh et al, 1988), E. tauvina (>85%; Chao and Lim, 1991), and E. suillus (>85%; Tan-Fermin et al, 1994). In contrast, we did not obtain sex-changed males, perhaps due to species differences, the timing of the experiment, initial fish size, or the dose and manner of hormone administration.…”

Section: Resultsmentioning

confidence: 84%

Effects of 17α-Methyltestosterone on Growth and Induced Sex Change in Longtooth Grouper Epinephelus bruneus (Bloch)

Park¹,

Im²

2011

Fisheries and aquatic sciences

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We examined the effects of 17α-methyltestosterone (MT) on growth and induced sex change in the longtooth grouper Epinephelus bruneus. The growth rate for body weight (GRW) and specific growth rate (SGR) of the group injected with MT over 8 weeks were significantly higher than those of the sham-injected control group, the group injected over 4 weeks, and the control group. Of the orally administrated groups, the GRWs of the control group and the group given 1 kg of feed with 2.0 mg of MT were highest and did not significantly differ from one another. For SGR, the treatment groups differed significantly, and the SGR of the control group was higher than those of the other groups (P<0.05). The condition factor (CF) of the group injected over 4 weeks was higher than those injected over 8 weeks, the sham-injected control group over 8 weeks, and the control group. The CF did not significantly differ between the sham-injected control group over 8 weeks and the injected group over 8 weeks, but these two groups differed from the control group (P<0.05). The CFs of the groups given 1 kg of feed with 0.5, 1.0, and 2.0 mg of MT were significantly higher than that of the control group (P<0.05). The feed efficiency ratio was not significantly affected by MT administration. Most of the experimental groups receiving MT developed many unidentified germ cell cysts and perinucleolus oocytes, although neither spermazoa cells nor sex-changed males were observed in any of the treatments.

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Section: Resultsmentioning

confidence: 84%

Effects of 17α-Methyltestosterone on Growth and Induced Sex Change in Longtooth Grouper Epinephelus bruneus (Bloch)

Park¹,

Im²

2011

Fisheries and aquatic sciences

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“…Most individuals recorded north of the Ryukyu Islands were young/immature but one individual (ca. 100 cm TL) recorded from Nichinan City probably exceeded the smallest maturity size of females (about 90 cm SL: Yeh et al 2003). On the other hand, at least three individuals recorded from the Ryukyu Islands were larger than 100 cm TL and therefore of mature size.…”

Section: Distributionmentioning

confidence: 88%

Review of the Japanese records of an endangered grouper, Epinephelus tukula, with comments on its population status (Teleostei, Serranidae)

Murase¹,

Miki²,

Wada³

et al. 2018

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The Potato Grouper, Epinephelus tukula, is relatively rare worldwide. Records from the northernmost part of its range (Japan) have been few, resulting in a “Critically Endangered” listing on the Red List for Japan. The Japanese records were revised by examining literature, new specimens, photographs, and the internet, and a continuous distribution pattern from the tropical Ryukyu Islands (including adult individuals) to temperate regions affected by the Kuroshio Current were delineated; this suggests the species inhabits tropical Japan and can spread to temperate regions via the warm current. The species possibly reproduces in Japanese waters but further reproductive ecology research is required.

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“…Even Yeh et al . () and Yeh et al . (,b) reported that the release of androgens from implant could last long for 60 days in E. coioides .…”

Section: Discussionmentioning

confidence: 99%

“…Similar findings by using androgen to induce sex reversal followed by hCG for inducing breeding with artificial fertilization (by stripping) were reported in E. tauvina and E. fuscoguttatus (Chao & Lim ) and E. coioides (Yeh et al . (); Yeh et al . (,b); Peatpisut & Bart ).…”

Section: Discussionmentioning

confidence: 99%

Efficacy of 17 α-methyl testosterone and letrozole on sex reversal of protogynous grouper,Epinephelus tauvina(Forskal, 1775) and spawning performance of sex-reversed males

et al. 2013

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This study aimed to test the efficacy of 17 amethyl testosterone (17 a-MT) alone and in combination with letrozole, an aromatase inhibitor, for the induction of sex reversal in protogynous greasy grouper, Epinephelus tauvina. Further, the long-lasting effects of these treatments and spawning performance of sex-reversed males were also investigated. Greasy grouper with oocytes in the perinucleolus stage were implanted with 5 mg 17 a-MT kg À1 body weight (T 1 ), 5 mg 17 a-MT and 0.2 mg letrozole kg À1 body weight (T 2 ) and 5 mg 17 a-MT with 0.4 mg letrozole kg À1 body weight (T 3 ) and no androgens/enzyme inhibitor implanted (C). The 17 a-MT alone and in combination of letrozole-induced sex reversal in greasy grouper, whereas untreated control fish (C) showed normal ovarian development. However, T 2 and T 3 group showed 100% sex reversal and completion of spermatogenesis up to functional male phase in 2 and 3 months, respectively, whereas T 1 group resulted in only 66.67% functional male with motile spermatozoa after 4 months. Sex-reversed males successfully fertilized the eggs during induced spawning. There were significant differences on fertilization and hatching rates between T 2 group (79.00 AE 4.36%; 77.67 AE 2.87%, respectively) and T 1 group (57.67 AE 3.17%; 63.87 AE 2.91%, respectively). The result suggested that 17 a-MT (5.0 mg kg À1 BW) in combination with letrozole (0.2 mg kg À1 BW) has the potential to produce 100% sex-reversed male in short period in greasy grouper, which might greatly help in seed production of greasy grouper.

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Induced sex change, spawning and larviculture of potato grouper, Epinephelus tukula

Cited by 32 publications

References 13 publications

Effects of 17α-Methyltestosterone on Growth and Induced Sex Change in Longtooth Grouper Epinephelus bruneus (Bloch)

Effects of 17α-Methyltestosterone on Growth and Induced Sex Change in Longtooth Grouper Epinephelus bruneus (Bloch)

Review of the Japanese records of an endangered grouper, Epinephelus tukula, with comments on its population status (Teleostei, Serranidae)

Efficacy of 17 α-methyl testosterone and letrozole on sex reversal of protogynous grouper,Epinephelus tauvina(Forskal, 1775) and spawning performance of sex-reversed males

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