南海区における底魚類の食態學的研究-I : ホウボウ科魚類の食性と産卵について

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The Hyuga Nada (Hyuga High Sea) when taken in wide sense extends off the eastern and east-southern coasts of Kyushu Island, viz., from up north the Bungo Strait down to south the Osumi Penninsula, and abounds, amoungst others, in red gurnards, of which economically important are the following five species; Chelidonichthys kumu, Pachytrigla alata, Lepido-trigla japonicus, L, güntheri and L, microptera. Examination of their stomach contents reveal that they devour by far Crustaceans and those small fishes as hidden in sand-mud or crawling on sea bottom (Table 2). Voracious as they are, their stomach was often found stuffed with food, which weighed 3-4% of the body at maximum. Table 3 and Fig. 1, A-F give the results of the statistical observation of their egg. Ova measuring over 1.0mm in diameter are characterized by having one or three oil globules and almost complete transparency and were taken as mature eggs. The degree of maturity was defined by ratio of mature ova to the whole ovary in weight and is given in Table 6. Single mature ovum weighs about 0.0011gr in Chelidonichthys kumu and about 0.00095gr in Pachytigla alata. Number of ova to be liberated at first spawning is estimated 10, 000-25, 000 in C, kumu, and 2, 000-3, 500 in P, alata.
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