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. 2024 Jul 19;14(14):2112.
doi: 10.3390/ani14142112.

The Improvement Effects of a Nutritional Fortifier on the Reproductive Performance, Sex Steroid Hormone Production, and Health of the Striped Bamboo Shark Chiloscyllium plagiosum

Junjie Zhang  1 , Chao Xu  1 , Yifan Zhang  2 , Yifu Zhong  2 , Dizhi Xie  1 , Peng Zhang  2 , Yuanyou Li  1
Affiliations

The Improvement Effects of a Nutritional Fortifier on the Reproductive Performance, Sex Steroid Hormone Production, and Health of the Striped Bamboo Shark Chiloscyllium plagiosum

Junjie Zhang et al. Animals (Basel). .

Abstract

To explore a method of improving the reproductive performance of the striped bamboo shark, three groups (D0, D1, and D2) of mature individuals were fed squid with (D1 and D2) or without (D0) a nutritional fortifier during the breeding seasons of 2022 and 2023. Compared with the D0 group, the D1 and D2 groups had an increase of 20.90% and 31.34% in total eggs, increases of 32.73% and 41.82% in the proportion of lecithal eggs, and a total 119.07% increase in hatching rate, respectively, in 2022. In 2023, the corresponding increase was 17.12% and 9.91% in total eggs, 19.63% and 12.15% in the proportion of lecithal eggs, 43.37% and 43.94% in fertilization rate, 23.94% and 22.22% in hatchability rate, and 66.70% and 8.70% in the survival rate of fry. Moreover, the levels of serum estradiol, testosterone, progesterone, albumin, and total antioxidant capacity and the levels of ARA, EPA, DHA, n-3 PUFA, and n-6 PUFA in both serum and lecithal eggs significantly increased, while the levels of serum triglyceride and total cholesterol were the opposite (p < 0.05). The results demonstrate that feeding the sharks with a nutritional fortifier can increase spawn production and the quality of eggs, regulate the production of sex steroids, and improve the nutrition of eggs and the health of broodstocks.

Keywords: Chiloscylium plagiosum; nutritional fortifier; reproductive performance; sex steroid hormone.

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Conflict of interest statement

Authors Yifan Zhang, Yifu Zhong, and Peng Zhang are employed by the Guangdong Chimelong Group Co., Ltd., which partially financed the project and provided the experimental animals, the striped bamboo shark. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Photographs of striped bamboo sharks: (a) shark morphology and (b) the distinction between males and females.
Figure 2
Figure 2
The levels of serum testosterone (A), estradiol (B) and progesterone (C) of Chiloscyllium plagiosum in the different experimental groups during 2022 or 2023. The values are presented as the mean ± SEM (n = 3). Bars assigned different superscripts were significantly different (p < 0.05).
Figure 3
Figure 3
Serum biochemical indexes of Chiloscyllium plagiosum in the different experimental groups during 2022 or 2023. The values are presented as the mean ± SEM (n = 3). Bars assigned with different superscripts were significantly different (p < 0.05). (A): triglyceride (TC); (B): total antioxidant capacity (T-AOC); (C): total cholesterol (TC); (D): albumin (ALB).
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