| With the overfishing of offshore marine fishery resources,the living environment of fishery had been seriously damaged,resulting in a sharp decline in the species and quantity of offshore organisms.At this time,people’s awareness of the protection of the marine environment was gradually strengthened,and the restoration of offshore fishery resources was beginning to become the focus of people’s thinking and attention.Many coastal countries and regions in the world had used the placement of artificial reefs to improve the marine environment in order to restore the species and quantity of marine life in the sea area,and had achieved good results.Through the reasonable placement of artificial reefs,many species of marine life could be lured,and could be provided with bait farms and breeding sites,in order to achieve the goal of sustainable development and utilization of marine fishery resources.In the selection and selection of artificial reefs,a total of 3 kinds of production materials were selected,namely,wooden fishing boats,concrete and granite,and a total of 5 different types of reef bodies were produced,namely,reinforced concrete members reef,reinforced plate frame granite reef,cement pipe cement column combination reef,large concrete member reef and ship reef.The reinforced concrete member reef was 1.8m*1.8m*1.7m;The large reinforced concrete member reef was 4m*4m*4m;the reinforced frame Rock Reef was also designed to growed up to 4m,bottom width 6m,high 3m,total length 8m and bottom width 3m,bottom width 6m,all high 7m,total length 12 m,that was 2 different specifications;The cement tube in the composite reef had a diameter of 0.6m and a length of 1.2m,and the cement column was a 1.2mx1.2mx0.6m cuboid shape,and the ship reef has no fixed size specification,and the surface spraying mortar was made according to the size of the used fishing vessel.Artificial reef area layout,reef area design and according to different purposes and technical requirements,set up in the form of points,lines,faces,mutual differences and corresponding linked of the reef layout,the point was mainly selected reinforced plate frame granite reef and concrete component reef,the line was mainly striped reef body,based on the point line composition surface.At present,the launch of Artificial reef had not formed a throwing standard and related technical evaluation,often through GPS positioning to throw,granite stone delivery using bucket throwing and bottom open position throwing two forms.Fish Collection Effect survey,set up a total of SG1,P1,P2 and Control point TS2 four stations,each station using floating gill net,bottom Gill net and ground cage to investigate,through the catch to determine the reef area fish collection effect.The floating gill net and the bottom gill net were retrieved 24 h after the lower net,while the cage was retrieved 72 h after the lower net,and the investigation period was three quarters in summer,autumn and winter.Attachment biological survey,through the lifting of artificial reef reef body Sampling survey,diver Sample box and submarine video three ways to investigate.Reef morphology survey,through the use of Klein System 3900 dual-frequency side sweep sonar survey and diver diving observation two forms of investigation,the main content of the investigation was in the reef body firmness.In the fish collection effect survey,the catch rate results showed that the winter survey of the floating gill net did not catch the creature,3000 acres of 2 quarters of the average floating gill net captured rate was 2.08 times the control point TS2,3 quarters of the average bottom gill net captured rate was 2.53 times the control point TS2,3 quarters of the average cage captured rate was 5.39 times the control point TS2,the results of fish density showed that 2 quarters of the average floating gill net fish density was 2.36 times the control point TS2,the average bottom gill net fish density in the quarter was 1.77 times that of the control point TS2,and the density of the average caged fish in 3 quarters was 2.22 times that of the control point TS2.Adhesion effect survey,reinforced plate frame granite reef better.The results of reef morphology survey showed that the reinforced plate frame granite reef and reinforced concrete component reef were superior to other reef types. |
