科研之友
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摘要
The panclalid Plesionika izumiae Omori, 1971 is widely distributed in the west Pacific regions. This is a relatively common shrimp in the coastal waters of Japan, except off northern Honshu and Hokkaido, and is commercially important for small-scale bottom seine fishery. The growth patterns and longevity of P. izumiae were estimated in Kagoshima Bay, southern Japan, using time series of the length-frequency distributions during February 2007 to January 2011. Carapace length ranged from 4.4-14.5 mm in males and 4.0-14.7 mm in females. Both males and females were first recruited in autumn (October-November) with modal size around 7.0 mm carapace length. The growth was best described by the Pauly and Gaschutz equation as L-t = 11.95[1 - exp{-3.991 (t/12 - 0.118) - (2.866/2 pi) sin(2 pi(t/12 - 0.955))}] for males and L-t = 12.73[1 - exp{-4.084(t/12 - 0.142) - (2.646/2 pi) sin(2 pi(t/12 - 0.912))}] for females. Females grew faster and reached a larger size at the same age than males. Monthly growth rate was lower during December to February and higher during March to May in both sexes. The longevity of this species was estimated to be around 18 months for both sexes. The relationship between carapace length and body weight indicated negative allometric growth in males and positive allometric growth in females.
- 出版日期2012-9
