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On the fish gathering effect of the artificial reefs ascertained by diving observation 10. in case of the open sea off ibusuki city japan






Memoirs of Faculty of Fisheries Kagoshima University 32: 193-206

On the fish gathering effect of the artificial reefs ascertained by diving observation 10. in case of the open sea off ibusuki city japan

The young of red sea bream (Chrysophrys major), numbering .apprx. 15,000, were released in the open sea off Ibusuki City at a depth of 14 m, in Aug. 1981; they were studied in the vicinity of the releasing fronts. The following results were obtained concerning the nursery artificial reef and the off shore concrete block reef. The young of red sea bream in the vicinity of the releasing sea front formed a school of thick density immediately after releasing. The school was reduced to .apprx. 1/3 of the original 1 on the 5th day; on the 21st day, it dispersed, scattering into groups containing .apprx. 500-1000 young. On the 108th day, confirmation was made about the 1 group containing .apprx. 300 young. No young of red sea bream were noted in the concrete-block reefs set at a depth of 35-40 m. The proper location at which the grouped artifical reefs were to be set was the cross-section where the inclination of the sea-bottom changed from sharp to gradual, at a depth of 35-50 m. Around the artificial reefs were gathered large fishes, such as horse mackerel Trachurus japonicus, rock bream, Oplegnathus fasciatus, crimson sea bream, Evynnis japonica and amberjack, Seriola aureovittata. The large artificial reef which was set at the sea front at a depth of 7 m, and given a mountinous shape with 2 heaps, showed an excellent fish gathering effect.


Accession: 006027210



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