杭州湾北部凤鲚雌、雄繁殖群体的渔业生物学特征

doi:10.16378/j.cnki.1003-1111.23039

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Abstract In order to determine the composition and fishery biological characteristics of reproductive stocks of estuarine tapertail anchovy Coilia mystus in Northern Hangzhou Bay,samples of estuarine tapertail anchovy were collected by set net during the reproductive period from May to August 2018, 2019, and 2020. The fishery biological characteristics of estuarine tapertail anchovy including the total length, body weight, and sex ratio were investigated. The results showed that total length distribution of female reproductive stocks of estuarine tapertail anchovy in Northern Hangzhou Bay ranged from 113 to 233 mm, and two dominant groups were found at 130—150 mm and 170—200 mm (73.2%). The total length distribution of male reproductive stocks of estuarine tapertail anchovy in Northern Hangzhou Bay ranged from 88 to 204 mm, and the dominant group were found at 110—140 mm (66.0%). The body weight distribution of female reproductive stocks ranged from 3.6 to 29.7 g, and two dominant groups were found at 6.0—10.0 g and 14.0—20.0 g (64.2%). The body weight distribution of male reproductive stocks ranged from 1.3 to 16.2 g, and the dominant group were found at 2.0—8.0 g (90.0%). The relationship between total length (L) and body weight (m) of female reproductive stocks was described as m =0.518×10^-5 L^2.874(r²=0.978, n =984). The relationship between total length and body weight of male reproductive stocks was m =1.033×10^-5 L^2.692( r²=0.957, n =661). The sex ratio of female to male was 1.49∶1, and the number of female individuals was significantly higher than that of male individuals (P<0.05). The gonadal development of female individuals was mainly in stages Ⅳ and Ⅴ, and total length of individuals whose gonad maturity stages had achieved Ⅳ or above were mainly founded at 140—150 mm and 170—200 mm. The gonadal development of male individuals was mainly in stages Ⅲ and Ⅳ, and total length of individuals whose gonad maturity stages had achieved Ⅳ or above were mainly founded at 110—150 mm. The feeding levels of the reproductive stocks of estuarine tapertail anchovy was mainly 0 and 1, accounting for 95.8%, and the empty stomach rate was only 69.2%. The findings indicated that the female reproductive stocks of estuarine tapertail anchovy in Northern Hangzhou Bay consisted of several generations, and maintained a certain feeding level during the reproductive period.

Key words： Coilia mystus reproductive stock fishery biology northern Hangzhou Bay

Received: 28 April 2023

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	WANG Miao
	HONG Bo
	ZHANG Dan
	YAN Jun

Cite this article:

WANG Miao,HONG Bo,ZHANG Dan, et al. Fishery Biological Characteristics of Reproductive Stocks of Estuarine Tapertail Anchovy Coilia mystus in Northern Hangzhou Bay[J]. Fisheries Science, 2024, 43(5): 793-800.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.23039 OR https://www.shchkx.com/EN/Y2024/V43/I5/793

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