摘要
金乌贼作为我国重要的头足类资源,具有较高的经济价值和营养价值。本文基于2017—2021年当年9月到翌年3月在东海中部(123.0°E~127.5°E,27.5°N~31.5°N)拖网调查采集的金乌贼样本,分析其胴长和体质量组成、性腺发育以及初次性成熟胴长L_(50)。结果显示,金乌贼雌雄个体优势胴长组分别为81~120 mm、81~140 mm;优势体质量组分别为41~280 g、41~200 g。金乌贼性腺发育低的个体生长快于性腺发育高的个体;且雌性生长快于雄性。调查期间,性腺随时间发育,161 mm以上的胴长组中未有Ⅰ期个体被发现。应用逻辑斯蒂方程和多项式胴长体质量模型估算L_(50)结果:雌性124.30和127.98 mm、雄性129.18和142.44 mm,基于多项式胴长体质量方程估算的L_(50)拟合效果更好。金乌贼存在明显的季节性生殖特征,在采样时间内繁殖期为1—3月;雌性在性成熟期间能量更多地从身体生长转变为性腺发育且生长模式的转变明显早于雄性;为便于渔民捕捞且保证捕捞个体均已达到性成熟,建议东海中部海域金乌贼最小开捕胴长应当大于142 mm。
Sepia esculenta as an important cephalopod resource in China,has high economic and nutritional value.This paper was based on a trawl survey of Sepia esculenta samples collected in the central part of the East China Sea(123.0°E-127.5°E,27.5°N-31.5°N)from September of the same year to March of the following year from 2017 to 2021,and analyzed their mantle length and body mass composition,gonadal development,and the first sexual maturity mantle length L_(50).The results showed that the dominant mantle length groups of both female and male individuals in the Sepia esculenta are 81-120 mm and 81-140 mm,respectively;the dominant body mass groups are 41-280 g and 41-200 g,respectively.Individuals with low gonadal development in the Sepia esculenta grow faster than individuals with high gonadal development;and females grow faster than males.During the investigation period,the gonads developed over time;no I stage individuals were found in the group with a mantle length of over 161 mm.The results using the logistic equation and polynomial mantle length and body mass model to estimate L_(50)are:124.30 mm and 127.98 mm for females,129.18 mm and 142.44 mm for males,respectively.The L_(50)estimated based on the polynomial mantle length and body mass equation has a better fitting effect.The Sepia esculenta has obvious seasonal reproductive characteristics,with a breeding period of 1-3 months during the sampling period;during maturity,females transit more energy from body growth to gonadal development,and their change in growth mode is significantly earlier than males;to facilitate fishing by fishermen and ensure that all individuals have reached maturity,it is recommended that the minimum opening length of the Sepia esculenta in the central waters of the East China Sea should be greater than 142 mm.
作者
薛薇
徐海龙
郭荣佩
方舟
XUE Wei;XU Hailong;GUO Rongpei;FANG Zhou(College of Marine Living Resource Sciences and Management,Shanghai Ocean University,Shanghai 201306,China;Department of Fishery Sciences,Tianjin Agricultural University,Tianjin 300384,China;Tianjin Key Laboratory of Aquaecology and Aquaculture,Tianjin 300384,China;National Demonstration Center for Experimental Aqua-ecology and Aquaculture Education,Tianjin 300384,China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai 201306,China;National Engineering Research Center for Oceanic Fisheries,Shanghai 201306,China;Key Laboratory of Oceanic Fisheries Exploitation,Ministry of Agriculture and Rural Affairs,Shanghai 201306,China;Scientific Observing and Experimental Station of Oceanic Fishery Resources,Ministry of Agriculture and Rural Affairs,Shanghai 201306,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2024年第3期715-727,共13页
Journal of Shanghai Ocean University
基金
国家自然科学基金青年项目(42306117)
上海市科技创新行动计划(19DZ1207502)
农业农村部外海渔业开发重点实验室开放课题(LOF 2018-02)。
关键词
金乌贼
初次性成熟胴长
逻辑斯蒂方程
多项式模型
东海
Sepia esculenta
first sexual maturity mantle length
logistic equation
polynomial model
the East China Sea
