Biological Characteristics of Ridgetail White Prawn Exopalaemon carinicauda in Yalu River Estuary
JI Guang1, LIU Xiuze1, DONG Jing1, WANG Xiaolin1, WANG Aiyong1, GUO Dong1, WANG Yuanyuan2, TIAN Yang3
1. Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian 116023, China; 2. Management of Fishery Administration of Pulandian in Dalian, Dalian 116200, China; 3. Management of Fishing Harbor Supervision of Pulandian in Dalian, Dalian 116200, China
Abstract：The biological characteristics of ridgetail white prawn Exopalaemon carinicauda, as an economically important species, were monthly surveyed in Yalu River Estuary 35 km away from the downstream of the Dandong River Bridge by nets with horizontal net mouth of 10 m, vertical net mouth of 4 m, and 20 m long net bag with mesh of 5 mm, hung on both sides of a fishing vessel from May to December 2017. The results showed that a total of 206 kg ridgetail white prawn were captured during the 8-month voyage,with the body length ranging from 23 to 78 mm,body weight ranging from 0.2 to 7.9 g,average body length of (50.7±9.9) mm,and average body weight of (2.3±1.4) g. The females had higher average body length and body weight than the males did. t test indicated that there were significant difference in body length and body weight between female and male (P<0.05). The relationships between body length (L) and body weight (m) were expressed as m=9.9×10-6L3.1138(r2=0.9219, female) and m=2.2×10-5L2.9081(r2=0.9274, male).There was not significant difference between the value of allometric growth factor b and 3 (P>0.05),showing that both male and female individuals are close to the constant growth. Voyage survey data from May to December combined with fishing information of fishing vessels in Yalu River Estuary, the ridgetail white prawn spawned in May until September,with the spawning peaks in June and August, and had absolute fecundity (FA) of 468—3151 eggs,with an average value of (1809±707) eggs. The best relationships between absolute fecundity (FA)and body length (L) and body weight (m) were power exponential fitting,which were FA=0.0194L2.7652(r2=0.7487) and FA=482.31m0.8955(r2=0.8301).
2021, Vol. 40 
