Sex ratio control in pink salmon (Oncorhynchus gorbuscha and chum salmon (O. keta) populations: The possible causes and mechanisms of changes in the sex ratio

Брыков, Вл. А.; Kukhlevsky, A. D.; Shevlyakov, E. A.; Kinas, N. M.; Заварина, Л. О.

doi:10.1134/s1022795408070053

Cited by 22 publications

(14 citation statements)

References 14 publications

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“…It is believed that sex determination in salmonids is strictly under genetic control but sometimes can be shifted towards predominance of one sex caused by some other factors (Brykov et al, 2008) and there are significant differences in fish the ratios of one river to another have been observed among the populations (Gilk et al, 2005). Thus, the control group of P3 hatchery might have showed a tendency towards femaleness.…”

Section: Discussionmentioning

confidence: 99%

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Altunok¹,

Peker²

2016

Turk. J. Fish. Aquat. Sci.

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The objective of the study was to investigate the effect of high temperature on sex ratios of early stage rainbow trout (Onchorhynchus mykiss) in commercially farmed populations from distinct hatcheries. Almost 32500 larvae from five different farms were used in experiments as thermal groups and their corresponding controls. Temperature treatments were conducted at 17.5°C for 40 days starting at day 10 after hatching. In only one population, the sex ratio was skewed significantly in favor of females in thermally treated group (67.5%), when compared to control group (52.1%) and there was deviation from the expected 1:1 ratio. In the treatment group the females grew 8.3% more than males. However there was no repeatiblity and any skewness in sex ratio of progenies from photoperiod induced spawning. Survival rates were not affected by the thermal treatments. The results showed that the increasing of femaleness of farmed stocks is possible by thermal treatment in rainbow trout and which depends on percentage of thermosensitive individuals rather than genetic background of population.

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Section: Discussionmentioning

confidence: 99%

Untitled

Altunok¹,

Peker²

2016

Turk. J. Fish. Aquat. Sci.

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“…The sex ratio may vary from the expected 1:1 from species to species, or even in the same population at different times, being influenced by several factors such as adaptation of the population, reproductive behavior, food availability and environmental conditions (Nikolsky, 1963;Emlen and Oring, 1977;Baroiller and D´Cotta, 2001;Brykov et al, 2008;Vandeputte et al, 2012).…”

Section: Sex Ratiomentioning

confidence: 99%

Gonad development and reproduction of the ballyhoo half beak, Hemiramphus brasiliensis from the coastal waters of Rio Grande do Norte, Brazil

et al. 2015

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The gonad development and reproductive aspects of Hemiramphus brasiliensis from the coastal waters of Rio Grande do Norte, Brazil were verified. This paper presents data on the length-weight relationship, sex ratio, length at first sexual maturity, gonad development, reproductive period and fecundity of H. brasiliensis. Females of this species predominated in the sampled population and were larger in size than the males. The length at the first sexual maturation of males was 20.8 cm and that of females was 21.5 cm. The macroscopic characteristics of the gonads indicated four maturation stages. Histological studies of gonads of H. brasiliensis showed six phases of oocyte development and four phases of spermatocyte development. The batch fecundity of this species is 1153 (±258.22) oocytes for 50 g body weight of female. The microscopic characteristics of gonad development indicate that H. brasiliensis is a multiple spawner, with active reproductive period during the months of January to June and October. The reproductive period of this species is independent of the rainy period of the region.Keywords: sex ratio, histology of gonads, fecundity, reproductive period. Palavras-chave: proporção sexual, histologia das gônadas, fecundidade, período reprodutivo. Desenvolvimento das gônadas e reprodução da agulha-preta,

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“…It is nowadays even used in fish farming to produce more profitable one-sex cultures (Pandian and Sheela 1995, Piferrer 2001, Cnaani and Levavi-Sivan 2009. Distorted sex ratios in the wild could potentially be caused by environmental sex reversal (Olsen et al 2006, Brykov et al 2008, Alho et al 2010. Sex hormones, hormone-active substances, and endocrine disrupting chemicals are frequently released into natural watercourses, for example, in effluents from domestic and industrial sources (Larsson et al 2000, Parks et al 2001, Jobling and Tyler 2003.…”

Section: What Affects Family Sex Ratios?mentioning

confidence: 99%

Managing Population Sex Ratios in Conservation Practice: How and Why?

Wedekind¹

2012

Topics in Conservation Biology

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Sex ratio control in pink salmon (Oncorhynchus gorbuscha and chum salmon (O. keta) populations: The possible causes and mechanisms of changes in the sex ratio

Cited by 22 publications

References 14 publications

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Gonad development and reproduction of the ballyhoo half beak, Hemiramphus brasiliensis from the coastal waters of Rio Grande do Norte, Brazil

Managing Population Sex Ratios in Conservation Practice: How and Why?

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