Distribution of Catches and Condition of Fishing Ground for Tuna Purse Seine in the Western Pacific Ocean

서부태평양에서 다랑어 선망어업의 어획분포와 어장환경

  • 김형석
  • Published : 1999.08.01

Abstract

Temperal and spacial analysis for catches have been drawing up a catch distribution chart and analysing catches and CPUE(Catch Per Unit Effort) using catch data with purpose of obtaining basic data to establish a selective method of effective fishing the tuna purse seine fishing ground.The temperature profile section and catch was surveyed to analyse the effect of catch in relation to the fishing ground environment.The results are as follows ;1. As for the catch variation between 1983 and 1984, the catch mainly took place on150^{\circ}E$, and after that it moved eastward enlarging the range of catch. In the monthly catch variation between January and February, the catches mainly happened on 135$^{\circ}$~ 150$^{\circ}$E, and then moved to the gradually westward. However, from July it moved to the South and from October Southeast.2. As to the eatch ratio for the school associated with the drifted object, the pelagic migrating school and the school associated with the biological objects, the catch ratio for the school associated with the drift objects was the highest. The catch ratio for the school associated with the drifted object was high in June, July and November whiles between January and March for the pelagic migrating school.3. SST(Sea Surface Temperature) was around 28~29^C$ on the observing line of 137^{\circ}E$ and the catches took place in the north equatorial counter-current situated on around $5^{\circ}~6^{\circ}N$. SST in the northern summer was 1^C$higher than winter and it was about 29~30^C$. The catch happened with the center of north equatorial counter-current. The reason why the catch mainly took place on the north equatorial counter-current is that main catch of tuna purse seine was the school associated with drift objects. It is thought that the fishing grounds are made in waters that have many drift objects like drift logs from the coast.

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References

  1. Mar. Fish. Rev. v.36 no.8 The skipjack tuna Katswonus pleamis, an underutilized resource Matsumoto W.M.
  2. NOAA Technical Report NMFS Circular v.451 Synopisis of Biological Data on Skipjack Tuna, Katswonus pelamis Matsumoto W.M.;Skillman R.A.;Dizon A.E
  3. Bull. Far Seas Fish. Res. Lab. v.2 Relation between the distribution of tunas and water types of the north and south Pacific ocean Yamanaka H.;Morita J.;Anraku N.