Significance of Egg and Larval Surveys in the Studies of Population Dynamics of Fish
The Japanese sardine, Sardinops melanosticta (Temminck and Schlegel), used to be one of the most important species of fish for the Japanese coastal fisheries, the catch amounting to 1,586,000 tons in 1936. However, the catch has declined since then and reached a minimum of 155,000 tons in 1945 (Kurita and Tanaka, 1956). After the war the nationwide Cooperative Iwashi Resources Investigations1 was started in 1949 to investigate the decline of the catch and to obtain scientific information for resource management and fishing forecasting (Nakai et al., 1955). The Investigations consisted of three main elements: a survey of the catch and effort statistics, a shore-based statistical survey (length and age data, etc.) at the fishing ports, and a survey at sea for eggs, larvae and hydrographic data, etc. The first aspect was discontinued after 1951 when the Statistics and Survey Division of the Ministry of Agriculture and Forestry commenced a survey of catch and effort statistics under a new system.
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- Nakai, Z., 1962. Studies of influences of environmental factors upon fertilization and development of the Japanese sardine eggs — with some reference to the number of their ova. Bull. Tokai reg. Fish. Res. Lab., 9, 109–150.Google Scholar
- Nakai, Z. and Hattori, S., 1962. Quantitative distribution of eggs and larvae of the Japanese sardine by year 1949 through 1951. Bull. Tokai reg. Fish. Res. Lab., 9, 23–60.Google Scholar
- Nakai, Z., Usami, S., Hattori, S., Honjo, K. and Hayashi, S., 1955. Progress Report of the Cooperative Iwashi Resources Investigations, April 1949 — December 1951. Tokai Reg. Fish. Res. Lab., Tokyo, 116 pp.Google Scholar
- Sette, O.E. and Ahlstrom, E.H., 1948. Estimations of abundance of the eggs of the Pacific pilchard (Sardinops caerulea) off southern California during 1940 and 1941. J. Mar. Res., 7, 511–542.Google Scholar
- Tanaka, S., 1955a. Estimation of the abundance of the eggs of fish such as sardine. I. Method of estimation by the vertical haul of plankton net. Bull. Jap. Soc. scient. Fish., 21, 386–389.Google Scholar
- Tanaka, S., 1958. A consideration on the rational exploitation of the stock of sardine, Sardinops melanosticta (T. & S.). Bull. Tokai reg. Fish. Res. Lab., 21, 1–13.Google Scholar
- Watanabe, T., 1970. Morphology and ecology of early stages of life in Japanese common mackerel, Scomber japonicus Houttuyn, with special reference to fluctuation of population. Bull. Tokai reg. Fish. Res. Lab., 62, 1–283.Google Scholar
- Yamanaka, I. and Ito, S., 1957. Progress Report of the Cooperative Iwashi Resources Investigations, 1954. Japan Sea Reg. Fish. Res. Lab., Niigata, 177 pp.Google Scholar