Preliminary evaluation on fish-aggregation effects of tetrahedron-like penetrating frame structure in Jingjiang channel regulation project
In order to realize the fish-aggregation effects of penetrating frame groups in Jingjiang channel regulation project,investigations were conducted from May to June,2014 in Jinchengzhou and from May to June,2015 in Lalinzhou.During investigations,net catching and hydro-acoustic monitoring methods were adopted.The results show that the quantity and weight of the fish caught were 204 individuals with a total weight of 94.58 kg,among which the quantity and weight of Parabramis pekinensis accounted for 64.71% and 39.62%,respectively.The average length of the caught fish was 26.90±8.82 cm,the longest was 80 cm and the shortest was 10 cm.The result of Hydro-acoustic investigations showed that the quantity of fish in Lalinzhou is 1.92 and 2.36 times to that in Jinchengzhou investigated by EY60 and DIDSON,respectively.The body length of fish monitored by EY60 in Jinchengzhou concentrated in the range from 5 to 10 cm,accounted for 55.24%,and that in Lalinzhou concentrated in the range from 30-50 cm,accounting for 45.38%.In general,the tetrahedron-like penetrating frame groups have a certain fish-aggregation effect.
NETL
NSTL
万方数据
维普
