Studies on the Stocks of Clupeoid Fishes in Hyuganada (I):Effects of the Oceanographical Conditions on the Spawning of the Anchovy, Engraulis japonicus T & S in Hyuganada

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The observations embodies in the prescent report were done during a period extending from April, 1948 to August, 1950 with a view to investigate into Occanographical conditions with special reference to the spawning of the Anchovy, Engraulis japonicus T & S. Fig. 3 shows location of 22 definite stations in Hyuganada where the study was continuonsly repeated once a month, with the results as given in Table 1. The fish abundantly spawned as tabufated in Table 4, when temperature lay between 17° and 22°C, and the salinity between 34.00‰ and 34.70‰. The data at our disposal gave the correlation coefficient between the water temperature and the spawning as -0.767, and the one for the salinity with respect to the same as +0.721. Monthly means for the temperature were then computed of the 22 stations. Differences from the means for each stations were calculated. These differences were then averaged down respectively. It was such localities where the above mentioned averaged differences were null or negative that the spawning of the fish was fond favorable. Fig. 4 delineates this relation.
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