Commercial methods for the control of sexual maturation in rainbow trout (Salmo gairdneri R.)

Bye, V.J.; Lincoln, R.F.

doi:10.1016/0044-8486(86)90208-5

Cited by 164 publications

(73 citation statements)

References 12 publications

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“…GSI ratio in all groups was lower in comparison to the control group treatment which is in agreement with Johnstone et al (5) and Bye et al (12), who report that male rainbow trout and Atlantic salmon reach maturity earlier than the females, respectively (5,12). Because of early maturation, sex reversed individuals could have higher GSI ratio against the control groups as it is reported by Baker et al (2), Nakamura (16), Pandian and Varadaraj (17) and Kavumpurath and Pandian (13).…”

Section: Resultssupporting

confidence: 82%

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Effects of Different Hormones on Sex Reversal of Rainbow Trout (Oncorhynchus MykissWalbaum) and Production of All-Female Populations

Atar

Bekcan

Doğankaya

2009

Biotechnology & Biotechnological Equipment

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Section: Resultssupporting

confidence: 82%

“…Sex reversal ratio of 100% using 3 mg/kg 17α-Methyltestosterone in 60 days was reported by Bye and Lincoln (5). The lower percentage measured in this study may be a result from many factors affecting the mechanism as it is pointed out also by Thorgaard and Gall (22).…”

Section: Resultsmentioning

confidence: 42%

Effects of Different Hormones on Sex Reversal of Rainbow Trout (Oncorhynchus MykissWalbaum) and Production of All-Female Populations

Atar

Bekcan

Doğankaya

2009

Biotechnology & Biotechnological Equipment

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“…In contrast, since spermatic ducts are absent in sex-reversed female rainbow trout, the spermatozoa remain within the testis (Tsumura et al 1991). However, the absence of spermatic ducts in neomales means they can only be used once for reproduction (Bye and Lincoln 1986). When we use to collect sex-reversed females semen a syringe, the specimen can be exploited for the next few spawning seasons.…”

Section: Discussionmentioning

confidence: 95%

Ultrasound evaluation of the gonadal structure in sex-reversed rainbow trout females

et al. 2013

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Ultrasound approach has been used to assess morphology of the gonadal structure in the sex-reversed rainbow trout females (neomales) provided in the course of 11b-hydroxyandrostenedione treatment applied within gonadal differentiation period. Eighteen matured individuals (in range 38.0-48.6 cm of body length and 802-1644 g of body weight) were scanned using digital ultrasound apparatus (DP-6900 model) Mindray Ltd., during the spawning season. After screening, fishes were killed to validate the morphological configuration and position of the gonads in the body cavity. The favorable place for cross-sectional imaging of gonadal lobes was half of the distance between the pectoral and pelvic fins below lateral line of neomales. Most of the examined specimens (61 %) had properly shaped, paired testis. Moreover, presence of individuals with asymmetrical gonads (33 %) and one bisexual fish was confirmed. There were no differences between total volume of sampled semen and sperm motility, but statistically significantly different in sperm concentration within selected (with symmetrical and asymmetrical testis) groups of neomales. It was confirmed that ultrasonic imaging is an efficient and accurate method to determine the state of gonads of mature sex-reversed rainbow trout females during spawning season and offers the opportunity for non-invasive detection of any morphological anomalies in their gonads.

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“…Generally, the answer appears to be no. (24,25,37). The most likely process to be affected is reproduction, because estrogens are pivotal to successful reproduction, particularly in females where they play major roles in controlling gonadotrophin secretion (38), vitellogenesis, synthesis of the eggshell proteins, and many other processes (39).…”

Section: Phylogenetic Considerationsmentioning

confidence: 99%

Vitellogenesis as a Biomarker for Estrogenic Contamination of the Aquatic Environment

Sumpter¹,

Jobling²

1995

Environmental Health Perspectives

337

345

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A rapidly increasing number of chemicals, or their degradation products, are being recognized as possessing estrogenic activity, albeit usually weak. We have found that effluent from sewage treatment works contains a chemical, or mixture of chemicals, that induces vitellogenin synthesis in male fish maintained in the effluent, thus indicating that the effluent is estrogenic. The effect was extremely pronounced and occurred at all sewage treatment works tested. The nature of the chemical or chemicals causing the effect is presently not known. However, we have tested a number of chemicals known to be estrogenic to mammals and have shown that they are also estrogenic to fish; that is, no species specificity was apparent. Many of these weakly estrogenic chemicals are known to be present in effluents. Further, a mixture of different estrogenic chemicals was considerably more potent than each of the chemicals when tested individually, suggesting that enhanced effects could occur when fish are exposed simultaneously to various estrogenic chemicals (as is likely to occur in rivers receiving effluent). Subsequent work should determine whether exposure to these chemicals at the concentrations present in the environment leads to any deleterious physiological effects. -Environ Health Perspect 103(Suppl 7): 173-178 (1995)

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Commercial methods for the control of sexual maturation in rainbow trout (Salmo gairdneri R.)

Cited by 164 publications

References 12 publications

Effects of Different Hormones on Sex Reversal of Rainbow Trout (Oncorhynchus MykissWalbaum) and Production of All-Female Populations

Effects of Different Hormones on Sex Reversal of Rainbow Trout (Oncorhynchus MykissWalbaum) and Production of All-Female Populations

Ultrasound evaluation of the gonadal structure in sex-reversed rainbow trout females

Vitellogenesis as a Biomarker for Estrogenic Contamination of the Aquatic Environment

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