Extent of spawning ground and distribution of eggs for ocellate puffer Takifugu rubripes at the mouth of Ise Bay [Japan]
2001
"Nakajima, H. (Mie-ken. Fisheries Technical Center, Hamashima (Japan))."
"An area at the mouth of Ise Bay, adjacent to Mie Prefecture and facing the open sea, is known as a spawning ground for ocellate puffer Takifugu rubripes because the spawning fish are found here in the one purse seine net in the springtime. In order to determine the size of the spawning ground and the distribution of the eggs, research, focusing on the relationship between the size of the bottom sediments and the number of eggs deposited, was carried out from 1995 to 1997. Dredge nets were used for collecting eggs while sledge nets were used for sediments. Abundant eggs were collected in areas where the bottom sediments were composed of dominant particles of between 2-4mm in diameter. Thus, the main spawning ground is estimated to lie between 34 deg 22.4' - 24'N, 136 deg 57.9' - 59.1'E, off Anori, Mie Prefecture. The main spawning season was found to be short, about two weeks, and its timing and duration greatly influenced by the water temperature. There was a tendency for the eggs to be aggregately distributed. As the distribution areas of abundant eggs coincided well with the purse seine net operating grounds, by monitoring them, it is possible to estimate the locations of the spawning grounds which shift slightly from year to year."
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