论文部分内容阅读
对长江口桁杆拖虾网采用套网法进行了选择性试验,分析研究了桁杆拖虾网3种网目尺寸的网囊对脊腹褐虾Cargon affini、葛氏长臂虾Palaemon gravieri和总体虾类的选择性。结果表明:当网囊网目尺寸为20、25、35 mm时,脊腹褐虾的50%选择体长分别为41.36、46.42、57.68 mm;葛氏长臂虾的50%选择体长分别为43.35、47.20、62.01 mm;总体虾类的50%选择体长分别为47.45、50.56、64.87 mm。虾类网囊网目内径(Me)与50%选择体长(L0.5)之间的关系:脊腹褐虾,L0.5=1.0964Me+19.179,R2=0.9984;葛氏长臂虾,L0.5=1.2779Me+16.777,R2=0.9814;总体虾类,L0.5=1.999Me+22.297,R2=0.9729。
Selective tests were carried out on the shrimp net of Yangtze River mouth trussed pole shrimp net by means of nets method. The effects of three net sizes of net shrimp net on the Cargon affini, Palaemon gravieri and Overall shrimp selectivity. The results showed that when the net size of mesh was 20, 25 and 35 mm, the length of 50% of the length of Chuanxiong brown shrimp was 41.36, 46.42 and 57.68 mm, respectively. The length of 50% 43.35,47.20,62.01 mm; 50% of the total shrimp body length selection were 47.45,50.56,64.87 mm. The relationship between the net inner diameter (Me) of shrimp cytoplasm and the length of selection of 50% (L0.5) was as follows: L0.5 = 1.0964Me + 19.179, R2 = 0.9984; L0.5 = 1.2779Me + 16.777, R2 = 0.9814; overall shrimp, L0.5 = 1.999Me + 22.297, R2 = 0.9729.