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Distribution, Relative Abundance, and Movement of Skipjack Tuna, Katsuwonus Pelamis, in the Pacific Ocean Based on Japanese Tuna Longline Catches, 1964-67
Catch data of the Japanese tuna longline fishery from 1964 to 1967 were analyzed to determine the distribution, abundance, and movement of skipjack tuna, Katsuwonus pelamis, in offshore waters of the Pacific Ocean. Large skipjack tuna, as well as larvae, were found to be concentrated mainly in the east central equatorial Pacific. Movement of skip-jack tuna stocks was determined by following the shifting of high-CPUE (catch per unit effort) cells from one quarter to the next. The apparent movement of skipjack tuna stocks in the Pacific appeared to coincide with the circulation of the major ocean currents; counterclockwise in the southern hemisphere and clockwise in the northern hemisphere, except in the eastern Pacific where the current flow is counterclockwise. The movement patterns of high CPUE suggested that skipjack tuna adults or their progeny could move from one area to the next. The movement pattern was used also to determine the probable migratory routes followed by skipjack tuna tagged in the eastern Pacific and recovered near the Hawaiian and Christmas islands.
Distribution of Fishing Effort and Catches of Skipjack Tuna, Katsuwonus Pelamis, in Hawaiian Waters
This report summarizes the amount of fishing efforts expended and the resulting skipjack tuna catches in Hawaiian waters.
Sustainability of Skipjack Tuna Fishery in Brazil
Sustainability of Skipjack tuna fishing in Brazil is the result of a research carried out by FUNBIO / RJ together with several researchers and professionals for the Marine and Fishing Research Support Project in Rio de Janeiro. The work is distributed in four major thematic units and organized in 13 chapters that dialogue in an interdisciplinary way, but with the same centralizing theme. There were 3 years of research involving these professionals and researchers, with the aim of refine and the existing data regarding the species known as "Katsuwonus pelamis" or Skipjack tuna, one of the most valuable species for the fishing industry. The main goal of these texts is to present to the general public and interested parties, grounded information on the importance of sustainable fishing in Brazil, mainly in relation to the valuable species Skipjack tuna, in Rio de Janeiro.
The Effect of Premortem Stress, Holding Temperatures, and Freezing on the Biochemistry and Quality of Skipjack Tuna
This experiment was designed to determine if there were differences (biochemical and/or organoleptic) before and after canning rested and stressed skipjack tuna. The live fish were captured off Oahu and were placed in shoreside tanks in Honolulu, Hawaii. After having been under observation for 24 hr, the fish were sacrificed in a rested or stressed condition. Stress was induced by forcing fish to swim around a tank until they showed signs of exhaustion. The rested fish were kept in a separate tank and were agitated as little as possible before being sacrificed. Some of the sacrificed tuna were canned immediately to serve as controls. Others were held in 32°, 60°, and 78° F seawater (SW) f...
