Abstract
Using the shrimps (Penaeus Japonicus BATE) obtained from the off shore by trammel nets, some experiments were carried out to know the behaviour of shrimp to moving plane net that was towed in various speed in water tank. 1. The reactions of shrimp to moving net in sea water tank can be classified into four major types. a) Jumping backward type b) Swimming forward type c) Sticking on the net type d) Crawling type 2. The relationship between the towing speed and the behaviour patterns of (a) and (b) type decrease according to the increase in the towing speed. But stick on the net type (c) increases proportionately to the towing speed. Crawling type (d) reveals only under the speed of 0.5m/sec. 3. Angling nets showed different herding ability by its angle and effectiveness of herding ability is superior in the order 30°>45°>60° respectively as shown in Fig. 2. 4. Maximum escaping speed was about 1.7m/sec and sustained distance with maximum speed was presumed as about 17m. 5. Desirable towing speed of the common shrimp trawl is thought to will be about 0.5m/sec according to the function of wing nets as shown in Fig. 1. 6. The position at which the shrimps were caught by trammel nets were within one meter from the sea bottom as shown in Fig. 4 and this data will give one hint to design the common shrimp trawl.
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