Filefish Research Articles

First record of the filefish,Pervagor nigrolineatus, from Japan

First record of the filefish,Pervagor nigrolineatus, from Japan

Diverse distribution of four distinct types of Modori (gel degradation)-inducing preoteinases among fish species.

Modori-inducing proteinase (MIP) could be classified into four types as follows on the basis of the extractability from muscle, the optimum temperature for the activity of myosin heavy chain degradation, and the sensitivity to n-butanol. (1) Sarcoplasmic-50°C-MIP (Sp-50-MIP) which is easily extractable, acts optimally at 50°C, and is not sensitive to n-butanol, (2) sarcoplasmic-60°C-MIP (Sp-60-MIP) which is also easily extractable, acts optimally at 60°C, and is sensitive to n-butanol, (3) myofibrillar-50°C-MIP (Mf-50-MIP) which is tightly associated with myofibrils, acts optimally at 50°C, and is not sensitive to n-butanol, and (4) myofibrillar-60°C-MIP (Mf-60-MIP) which is also tightly associated with myofibrils, acts optimally at 60°C, and is sensitive to n-butanol. Twelve fish species examined were classified into the following five groups according to the dis-tribution pattern of the above 4 types of MIP. (1) The species having only Sp-60-MIP, such as walleye pollack, mud dab, rainbow trout, brown croaker and red sea bream, (2) the species having both Sp-50-MIP and Sp-60-MIP, such as threadfin bream, (3) the species having both Mf-50-MIP and Mf-60-MIP, such as crucian carp, Pacific mackerel and file fish, (4) the species having both Sp-60-MIP and Mf-60-MIP, such as nibe croaker and tilpia, and (5) the species having Sp-60-MIP, Mf-50-MIP, and Mf-60-MIP, such as shortfin lizard fish.

ウマヅラハギにみられた顕著な脊椎彎曲症

ウマヅラハギにみられた顕著な脊椎彎曲症

<sup>32</sup>Pによる魚類の捕食種と餌種の定量的関係

1) A few species of marine and fresh waters preys and predators were used to find out the absorption rate, with 32P as indicator. 2) Fresh water fishes showed lower absorption rate than marine water fishes about most of preys except that of insect larvae and planktonic crustacean. 3) When the taxonomical position of pery and predator was close the absorption rate was higher. 4) Young ones of any fish were found to be good food for any large size fish. 5) Absorption rate was higher when the fish was fed by the muscle of the same species of fish as the predator. 6) When goby was fed with different parts of goby as prey, a lower value was seen in the case of bone as prey. 7) Bivalve mantle was found to be good food for all fishes except minnow which has no habit to take it in nature. 8) Insect larvae and small planktonic crustacean were found to be good food for all fishes except goby, file fish and minnow. 9) Absorption rate obtained by the experiments stood same for any concentration of 32P in the prey.