Abstract
The present paper gives the observations reterable to the distribution of mackerel larvae, P. tapeinocephalus, collected by larval net operated at the six layers of 0 (surface), 10, 20, 30, 40, and 50 meters in the region covering Kagoshima Bay and the Osumi channel, and some considerations, especially on the collecting method in relation to the current velocity. The results (Tables 2 and 3) are summarized as the following lines. 1) From April to June 1960, and in March 1961 the mackerel larvae are found at all the observed layers but 50 meter one, in the fishing ground (of the adult fish) of the said region. 2) The collected larvae are of 3.1-21.0mm in total length. Most of them are small, of less than 10mm in total length (Fig. 3). 3) The collection rate from the 10m layer rises to the highest, that is of 67%. 4) The large number of samples are collected under the conditions of 18-19°C in water temperature, and 34.7-34.8% in salinity (Fig. 4).
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