鸭绿江丹东段扁吻鮈的个体生殖力及初次性成熟体长与年龄  

Individual fecundity,and body length and age at first maturity in striped shiner(Pungtungia herzi)in Dandong section of Yalu River

作　　者：严林 田静 彭祖想 王悦晗 兰婷 段友健 韩雨哲 YAN Lin;TIAN Jing;PENG Zuxiang;WANG Yuehan;LAN Ting;DUAN Youjian;HAN Yuzhe(College of Fisheries and Life Science,Dalian Ocean University,Dalian 116023,China;Development Service Center of Modern Agricultural Production Base,Panshan County,Liaoning Province,Panshan 124107,China;Key Laboratory of Fish Applied Biology and Aquaculture in North China,Liaoning Province,Dalian Ocean University,Dalian 116023,China)

机构地区：[1]大连海洋大学水产与生命学院,辽宁大连116023 [2]辽宁省盘山县现代农业生产基地发展服务中心,辽宁盘山124107 [3]大连海洋大学辽宁省北方鱼类应用生物学与增养殖重点实验室,辽宁大连116023

出　　处：《大连海洋大学学报》2023年第1期112-119,共8页Journal of Dalian Ocean University

基　　金：丹东临港集团有限公司增殖放流效果评估项目;农业财政专项“东北地区重点水域渔业资源与环境调查”。

摘　　要：为探明鸭绿江扁吻鮈(Pungtungia herzi)的个体生殖力及初次性成熟体长与年龄,于2020年11月—2022年4月按季度采样,共采集扁吻鮈398尾,其中雌性个体210尾,雄性个体188尾,测量所有样本的体长(L)、体质量(W)、净体质量(W0)和卵巢质量(W1),并计算成熟系数(GSI)和丰满度(K),取鳞片鉴定年龄,用质量法计数个体绝对生殖力(F)、体长相对生殖力(FL)及体质量相对生殖力(FW),用5种数学模型拟合个体生殖力与形态指标的关系,采用L50%方法确定初次性成熟年龄和体长。结果表明:鸭绿江扁吻鮈种群由1、2、3、4龄组成,雄性1龄占比70.74%,2龄占比22.87%,3龄和4龄分别占比5.85%、0.53%(n=188);雌性1龄占比71.75%,2龄占比19.77%,3龄和4龄分别占比6.78%、1.69%(n=210);雄性、雌性鱼优势体长组均为60.01~90.00 mm,优势体质量组均为0.00~15.00 g;雌性个体绝对生殖力为(1835.00±946.66)粒,体长相对生殖力为(23.13±9.43)粒/mm,体质量相对生殖力为(199.84±61.26)粒/g;F、FL和FW与体长、体质量、净体质量和年龄均存在函数关系;扁吻鮈种群初次性成熟体长和年龄估算显示,雄性和雌性个体的初次性成熟体长分别为47.07、53.28 mm,初次性成熟年龄分别为1.18龄、1.06龄。研究表明,鸭绿江扁吻鮈个体较小,繁殖群体以1龄为主,其性成熟较早、怀卵量大,繁殖策略属于典型的r-对策者。In order to explore individual fecundity and body length and age at first maturity of striped shiner(Pungtungia herzi)in Yalu River,398 individuals including 210 females and 188 males were seasonally collected in Dandong section of Yalu River by traps and drift gillnets from November 2020 to April 2022.The body length(L),body weight(W),net body weight(W0)and ovarian weight(W1)were measured,and the gonado-somatic index(GSI)and condition factor(K)were calculated.Absolute fecundity(F),relative fecundity of body length(FL)and relative fecundity of body weight(FW)were counted by weight method.Five mathematical models were used to fit the relationship between individual fecundity and morphological indices,and the age at first maturity was determined by L50%’s method.The results showed that the striped shiner population in Dandong section of Yalu River was primarily composed of 1,2,3 and 4 years old individuals.with 70.74%of 1 year old males,22.87%of 2 years old males,5.85%of 3 years old males and 0.53%of 4 years old males(n=188),and the females accounted for 71.75%of 1 year old individuals,19.77%of the 2 years old individuals,6.78%of 3 years old individuals and 1.69%of 4 years old individuals(n=210).The female and male had dominant body length from 60.01 mm to 90.00 mm,and the dominant body weight from 0.00 g to 15.00 g.The striped shiner had average individual absolute fecundity(F)of(1835.00±946.66)eggs,average individual relative fecundity(FL)of(23.13±9.43)eggs/mm and the average individual relative fecundity(FW)of(199.84±61.26)eggs/g.The relationships between F,FLand FWand body length,body weight,net weight,and age was expressed as function and the first maturity was estimated to be 47.07 mm in body length at age of 1.18 years for males and 53.28 mm in body length at age of 1.06 years for females.The findings indicate that the striped shiner is characterized by small size,dominantly composed of 1-year-old individuals,early maturity,large fecundity,and r reproductive strategy.

关 键 词：扁吻鮈 生殖力 初次性成熟 鸭绿江 

分 类 号：S961.1[农业科学—水产养殖]