Annual changes in testicular development and plasma sex steroids in the captive male dojo loach Misgurnus anguillicaudatus

Kiros, Solomon; Aoki, Junya; Park, Chang-Beom; Soyano, Kiyoshi

doi:10.1007/s10228-011-0213-7

Cited by 13 publications

(1 citation statement)

References 34 publications

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“…. Solomon et al, 2011;Smith and Walker, 2004;Tan-Fermin et al, 1997) , (Shiota et al, 2003). (Fonds, 1979;Murawski, 1993), (Seo et al, 2010).…”

Section: 포란수mentioning

confidence: 99%

Maturation and Spawning of the Flathead Flounder Hippoglossoides dubius off the coast of Gangwon Province, East Sea of Korea

Choi¹,

Yoon²,

Park³

et al. 2013

Korean Journal of Fisheries and Aquatic Sciences

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Flathead flounder Hippoglossoides dubius is a commercially important fish in the coastal waters of Gangwon Province, which is its spawning ground and breeding habitat. A total of 1,669 gonads were sampled monthly from February 2011 to May 2013 to investigate ecological characteristics, such as variations in maturation and spawning by gonad index, visual maturity stage, histological observations and oocyte diameter. Males were numerically dominant over females in the fishing grounds year round. The spawning season was from January to April, and the peak was from February to March. Oocyte number as a measure of fecundity was between 27,372 and 915,209 eggs with a length range of 26.0-48.7 cm TL, while the largest oocyte grew to 0.9-1.4mm in egg diameter during its spawning season. The relationship between fecundity and total length was F=0.0016TL 5.2539 . The smallest mature lengths of the females and males were 28.4 and 22.6 cm respectively, and the 50% mature lengths of females and males were 32.9, 26.9 cm respectively.

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“…. Solomon et al, 2011;Smith and Walker, 2004;Tan-Fermin et al, 1997) , (Shiota et al, 2003). (Fonds, 1979;Murawski, 1993), (Seo et al, 2010).…”

Section: 포란수mentioning

confidence: 99%

Maturation and Spawning of the Flathead Flounder Hippoglossoides dubius off the coast of Gangwon Province, East Sea of Korea

Choi¹,

Yoon²,

Park³

et al. 2013

Korean Journal of Fisheries and Aquatic Sciences

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Climate Change Impact on Biodiversity of Indigenous Small Fish

Karnatak,

Nair,

Ekka

et al. 2024

Perspectives and Applications of Indigenous Small Fish in India

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Progestin is important for testicular development of male turbot (Scophthalmus maximus) during the annual reproductive cycle through functionally distinct progestin receptors

Feng

Liu

et al. 2017

Fish Physiol Biochem

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In teleost, sex steroid hormones are critical for reproduction. Progestin is known to promote spermiation. To further understand the functions of progestin via its receptors during the annual reproductive cycle in male turbot (Scophthalmus maximus), we observed testicular development, quantified several sex steroid hormones, detected the expression of progestin receptors, and measured various sperm parameters. Results showed that the turbot testicular structure was of the lobular type. During breeding season, a number of spermatocytes (stage III) developed into spermatids (stage IV), then differentiated into sperm during spermiogenesis (stage V), and finally regressed to spermatocytes (stage VI). Concomitant with testicular development, serum progesterone (P4) and 17α,20β-dihydroxy-4-pregnen-3-one (DHP) exhibited higher levels from stage IV to V than other stages. Furthermore, males with higher motility sperm showed higher levels of P4 and DHP compared with fish with lower motility sperm. These results indicated that P4 and DHP might induce spermatogenesis due to seasonal changes. Concurrently, in testes, the nuclear progesterone receptor (pgr) was expressed throughout the reproductive cycle and its level peaked during spermiogenesis while expression of membrane progestin receptor alpha (mPRα) did not change significantly. However, in sperm, mPRα expression was higher than in testes and had a significant positive correlation with curvilinear velocities (VCL), sperm motility, and motility duration. In conclusion, progestin appears to exert a direct pgr-mediated effect on spermiogenesis and improve sperm motility characteristics depending on the abundance of mPRα protein in sperm during spermiation.

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Annual changes in testicular development and plasma sex steroids in the captive male dojo loach Misgurnus anguillicaudatus

Cited by 13 publications

References 34 publications

Maturation and Spawning of the Flathead Flounder Hippoglossoides dubius off the coast of Gangwon Province, East Sea of Korea

Maturation and Spawning of the Flathead Flounder Hippoglossoides dubius off the coast of Gangwon Province, East Sea of Korea

Climate Change Impact on Biodiversity of Indigenous Small Fish

Progestin is important for testicular development of male turbot (Scophthalmus maximus) during the annual reproductive cycle through functionally distinct progestin receptors

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