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Shishidou H.,Kagoshima Prefecture Fisheries Technology and Development Center | Takimoto A.,Tokyo University of Marine Science and Technology | Obata Y.,Japan National Research Institute of Fisheries And Environment of Inland Sea | Hamasaki K.,Tokyo University of Marine Science and Technology | Kitada S.,Tokyo University of Marine Science and Technology
Nippon Suisan Gakkaishi (Japanese Edition)

Population sizes of red sea bream (RSB) Pagrus major in Kagoshima Bay were estimated both for wild and released fish by cohort analysis from 1990 to 2002 to consider its fishery management and release strategies. The analysis showed that the population size of released fish had decreased while that of wild fish remained stable. The commercial catch of wild fish tended to decrease as that of released fish increased over 50 tons. The results suggested that the RSB enhancement program with the scale of 700-800 thousand seeds released and 50 tons recaptured was appropriate. Predictions of red sea bream catch in 2017 by a simple population dynamics model under various scenarios of fishing regulation and seed release showed that the catch increases under the enhancement program with improved stocking efficiency. Source

Inohara K.,Kagoshima University | Kurogi S.,Kagoshima University | Onoue Y.,Kagoshima University | Hamada M.,Ltd Liability Company Keitensuisan | And 2 more authors.
Nippon Suisan Gakkaishi (Japanese Edition)

Frozen fish products are generally transported and stored at -20°C. This storage condition, however, causes rapid progression of autoxidation of myoglobin and browning of dark muscle, reducing the commercial value of fish for sashimi. In the previous paper, we reported the suppressive function of ATP on the autoxidation of myoglobin by heat treatment. In this study, we investigated the effect of ATP in muscle on the progression of autoxidation of myoglobin in dark muscle of cultured amberjack during frozen storage at -20°C. Amberjack fillets quick-frozen at -50°C containing various concentrations of ATP were prepared and then stored at -20°C for four months. The progression of autoxidation of myoglobin was suppressed in the fillets containing high concentrations of ATP. We also developed a method for measuring the ratio of generated metmyoglobin in myoglobin contained in dark muscle of amberjack. Source

Tamotsu S.,Kagoshima Prefecture Fisheries Technology and Development Center | Sugita T.,National Research Institute of Aquaculture | Tsuruda K.,Kagoshima Prefecture Fisheries Technology and Development Center | Fukuda Y.,National Fisheries University | Kimura I.,Kagoshima University
Nippon Suisan Gakkaishi (Japanese Edition)

Instantaneously-killed spotted mackerel Scomber australasicus which had rested in a fish cage for a few days before being killed maintained a higher flesh quality for a longer time postmortem, and contained a high content of ATP in muscle after cooling in ice for 9 h. To elucidate the effects of resting in a fish cage on the flesh quality of spotted mackerel caught by a purse seine, the muscle, blood and liver metabolites after exhaustive exercise for 20 min by hauling with a net using fish that had previously rested well in a fish cage were monitored over a 72-h period. The concentrations of plasma cortisol in blood and lactate in muscle increased with the exercise, and then decreased during resting for 72 h. The glycogen content in liver also recovered during resting. The ATP content in muscle immediately after the exercise was, however, elevated. Source

Weerakhun S.,Nippon Veterinary and Life Science University | Wada S.,Nippon Veterinary and Life Science University | Hatai K.,Nippon Veterinary and Life Science University | Sano A.,Chiba University | And 2 more authors.
Fish Pathology

We conducted experimental infection tests of Mycobacterium marinum NJB 0419 isolated from yellowtail Seriola quinqueradiata to amberjack S. dumerili and red sea bream Pagrus major to determine the pathogenicity of the bacterium. As a result, NJB 0419 was pathogenic to both of them. In light of concerns about zoonoses, BALB/c mice were intravenously or subcutaneously injected with NJB 0419. The histopathological findings of examined mouse tissues were normal. Acid-fast bacteria were not found in the tissues and not re-isolated from the tissues. Our data suggest that M. marinum NJB 0419 might not be a strong pathogen of mammals, although more intensive studies are required for confirmation of the pathogenicity. © 2010 The Japanese Society of Fish Pathology. Source

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