荆江航道整治工程中透水框架集鱼效果初步评估

为了解荆江航道整治工程中透水框架的集鱼效果,分别于2014年5-6月和2015年5-6月,采用科学探鱼仪SIMRAD EY60和双频识别声纳(DIDSON)ARIS EXPORER 1800两种水声学设备,分别对荆江瓦口子水道的金城洲和太平口水道的腊林洲透水框架水域的鱼类分布情况进行了水声学监测,并对工程江段的鱼类进行了刺网调查。结果显示:采用刺网捕获鱼类17种共204尾,其中数量和重量最多的都是鳊鱼,分别占64.71%和39.62%。渔获物体长范围是10~80 cm,平均体长是(26.90±8.82)cm;EY60监测到腊林洲工程区鱼的数目是金城洲工程区的1.92倍,DIDSON监测腊林洲工程区鱼的数目是金城洲工程区的2.36倍;EY60监测到金城洲鱼类体长集中在5~10 cm,占55.24%,腊林洲鱼类体长集中在30~50 cm,占45.38%。结果表明,透水框架群对于鱼类具有一定的诱集效果。

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.