松川浦アサクサノリ養殖場の研究-I : アサクサノリの窒素・燐含有量に影響する環境要因に就いて
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In a previous paper, we have reported on environmental characteristics of cultural grounds of a laver, Porphyra tenera Kjellman in Matsushima Bay. The present work carried out to make clear the environmental factors affecting upon the production of laver at Matsukawa-Ura Inlet from October in 1952 to March in 1953 is a comparative study with the preceeding work at Matsushima Bay. The results are summarized as follows: 1. The inlet water was remarkably interchanged with Sendai Bay water by tidal currents. The quantities of water of all inflowing rivers into this inlet were so small that the most part of the inlet except small areas lccated near river mouth was chiefly occupied by the water with nearly equal salinity to Sendai Bay water. Therefore, the cultural grounds would always be exposed to the outside waters of the inlet. 2. Though the contents of nutrient salts in Sendai Bay water were generally poor, the nutrient supplies during the cultural season from autumn to early spring were relatively abundant owing to nutrient rich water of Oyashio which had sometimes inflowed to Sendai Bay. Therefore, it seems reasonable to suppose that the production of laver in this inlet may be attributed to the inflow of Oyashio. 3. According to chemical analysis of laver, the nitrogen contents fluctuated from 1.93 to 6.52 in per cent of dry weight and the phosphorus contents were 0.237±0.057 in per cent of dry weight. The low values and the small variation of phosphorus contents suggest that the necessary amount of phosphorus to support the growth of laver is about 0.2 per cent of dry weight of laver. On the other hand, N:P ratio had considerable variance, showing the values between 7.2 and 28.2. The change in N:P ratio was chiefly due to the fluctuation of nitrogen contents. The nitrogen contents of the samples collected after January were almost below 3 per cent of dry weight. This low value seems to be the results of insufficient supply in nitrogenous nutrients.
- 公益社団法人 日本水産学会の論文
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