Gender and gonadal maturity stage identification of captive Chinese sturgeon, Acipenser sinensis, using ultrasound imagery and sex steroids.
Identifieur interne : 000725 ( Ncbi/Curation ); précédent : 000724; suivant : 000726Gender and gonadal maturity stage identification of captive Chinese sturgeon, Acipenser sinensis, using ultrasound imagery and sex steroids.
Auteurs : Hao Du [République populaire de Chine] ; Xiaoyan Zhang [République populaire de Chine] ; Xiaoqian Leng [République populaire de Chine] ; Shuhuan Zhang [République populaire de Chine] ; Jiang Luo [République populaire de Chine] ; Zhigang Liu [République populaire de Chine] ; Xingmei Qiao [République populaire de Chine] ; Boyd Kynard [États-Unis] ; Qiwei Wei [République populaire de Chine]Source :
- General and comparative endocrinology [ 1095-6840 ] ; 2016.
Abstract
Long lifespan and late maturation make it difficult to establish gamete maturity and breeding age of captive endangered Chinese sturgeon, Acipenser sinensis. This greatly handicaps timely breeding and future conservation stocking efforts. We used ultrasound imagery and sex steroids to determine the gender and gonadal maturity stage of captive Chinese sturgeon (age, 10-17years old). The echogenicity of the reproductive organs and the respective morphology of the gonads were described and two quantitative parameters po (proportion of the ovary to the entire reproductive organs) and d (thickness of the reproductive organs) were measured to characterize sex and maturity stage of Chinese sturgeon. Females were accordingly placed fish into several categories: FII (FII(-), FII, FII(+)), FIII (FIII, FIII(+)) and FIV (FIV, FIV(+)) and FVI and males as MII, MIII, MIV, MV and MVI. The accuracy of gender and maturity stage determination provided by ultrasonographic methods was 72.7% for FII(-) ovary (n=11) and 76.2% for MII testis (n=42). Accuracy of sex and maturity determination using only serum sex steroid of testosterone (T) and estradiol-17β (E2) was low (58-73%, depending on maturity stage). However, when the two methods were used together, accuracy increased sharply, especially for immature (II stage) females. In summary, of 151 Chinese sturgeon, whose sex and maturity stage were independently confirmed, 88.1% (n=133), 62.9% (n=95), and 96.7% (n=146) were successfully sexed and staged using ultrasound, sex steroids, or both methods, respectively. The results provide reliable non-invasive techniques for determining sex and gonadal maturation of captive Chinese sturgeon. These methods can track individual gonad characteristics over multi-year reproductive cycles, which will assist captive broodstock management, artificial reproduction, and future conservation stocking.
DOI: 10.1016/j.ygcen.2016.08.004
PubMed: 27497707
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Ltd, Beijing 100081, China.</nlm:affiliation><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Beijing Aquarium, Beijing Xinwoda Marine Technology Co. 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Electronic address: weiqw@yfi.ac.cn.</nlm:affiliation><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture of China, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223</wicri:regionArea><wicri:noRegion>Wuhan 430223</wicri:noRegion></affiliation></author></analytic><series><title level="j">General and comparative endocrinology</title><idno type="eISSN">1095-6840</idno><imprint><date when="2016" type="published">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Long lifespan and late maturation make it difficult to establish gamete maturity and breeding age of captive endangered Chinese sturgeon, Acipenser sinensis. This greatly handicaps timely breeding and future conservation stocking efforts. We used ultrasound imagery and sex steroids to determine the gender and gonadal maturity stage of captive Chinese sturgeon (age, 10-17years old). The echogenicity of the reproductive organs and the respective morphology of the gonads were described and two quantitative parameters po (proportion of the ovary to the entire reproductive organs) and d (thickness of the reproductive organs) were measured to characterize sex and maturity stage of Chinese sturgeon. Females were accordingly placed fish into several categories: FII (FII(-), FII, FII(+)), FIII (FIII, FIII(+)) and FIV (FIV, FIV(+)) and FVI and males as MII, MIII, MIV, MV and MVI. The accuracy of gender and maturity stage determination provided by ultrasonographic methods was 72.7% for FII(-) ovary (n=11) and 76.2% for MII testis (n=42). Accuracy of sex and maturity determination using only serum sex steroid of testosterone (T) and estradiol-17β (E2) was low (58-73%, depending on maturity stage). However, when the two methods were used together, accuracy increased sharply, especially for immature (II stage) females. In summary, of 151 Chinese sturgeon, whose sex and maturity stage were independently confirmed, 88.1% (n=133), 62.9% (n=95), and 96.7% (n=146) were successfully sexed and staged using ultrasound, sex steroids, or both methods, respectively. The results provide reliable non-invasive techniques for determining sex and gonadal maturation of captive Chinese sturgeon. These methods can track individual gonad characteristics over multi-year reproductive cycles, which will assist captive broodstock management, artificial reproduction, and future conservation stocking.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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