Theselectivity about separating mesh for fishes and shrimps of multi-anchored monolithic trap in Liaodong Bay
In order to grasp the effect of separating mesh on the catch separation effect of multi-anchor monolithic trap and to solve the problem of mixed catch of fish and shrimp,a test net with a mesh size of 18 mm for the main net jacket and a 35 mm mesh size separating mesh was used to conduct a four-network effective production test study in the sea area of Liaodong Bay.In this study,the main purpose of designing a multi-anchor monolithic trap device for separating fish and shrimp is to be used for separating different species of catches caught in the open-net operation.In this sea trial,due to the influence of various factors such as changes in offshore fishery resource stocks,operating seasons,operating locations,tides,and so on,the main dominant species caught were Collichthys lucidus,Acanthogobiu sommaturus,Palaemon gravieri and Eualus sinensis.The results showed that fish were the main species caught in the covered net,accounting for more than 85.0%of the total number of catches,the average separation rates of Collichthys lucidus and Acanthogobiu sommaturus were 79.76%and 82.90%,respectively;and the dominant length groups were concentrated in the range of 91-110 mm and 101-120 mm,respectively.Shrimp were the main species caught in the codend net,accounting for more than 80.0%of the total number of catches The average separation rates of Palaemon gravieri and Eualus sinensis were 85.92%and 85.47%,respectively;and the dominant length groups were mainly concentrated in 51-70 mm and 31-50 mm,respectively.The study shows that the test net has obvious effect on the separation of the dominant species after the installation of the separation net,and can bring better economic benefits to the fishermen,and the results of this study can provide a reference basis for the optimization of the structure of multi-anchor monolithic trap in China.
multi-anchor monolithic trapfish and shrimp separation netfishing gear selectivitymarine fishingLiaodong Bay
万方数据
维普
