• Title/Summary/Keyword: Continuous spawning fishes

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A seasonal growth curve estimation for continuous spawning fishes (연속 산란 어류의 온도함수 성장곡선 추정)

  • Choi, Il-Su
    • Journal of the Korean Data and Information Science Society
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    • v.22 no.5
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    • pp.903-910
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    • 2011

  • The von Bertalanffy growth function (VBGF) is the result of the antagonistic effects of anabolism and cataboliem. However VGBF has limitations for describing the growth of continuous spawning fishes. In the present work, a new equation is proposed where the growth parameter Kis substituted by a function related to the sea surface temperature of spawning period. Examples for natural population of Pacific Anchovy are presented.

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Ecology of Cynoglossus joyneri G$\ddot{u}$nther from the Western Coast of Korea (한국 서해연안 참서대 Cynoglossus joyneri G$\ddot{u}$nther의 생태)

  • Choi, Youn;Kim, Ik-Soo;Ryu, Bong-Suk;Chung, Ee-Yung;Park, Jong-Young
    • Korean Journal of Ichthyology
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    • v.7 no.1
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    • pp.56-63
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    • 1995

  • Ecological study of the Cynoglossus joyneri was conducted based on the specimens from the western coast of Korea from 1992 to 1994. Ecological characteristics of this species such as gonadal development, occurrence of larvae, stomach contents, and environmental conditions were investigated. Few larvae of Cynoglossus joyneri occurred in Kunsan coast. This coast is influenced by the freshwater input of the Mangyong and Kum River, especially during the summer. Therefore, the larvae of C. joyneri were considered to be spawned and grown during their early life stage in the high saline water in outer bay. Spawning occur from June to September, having the peak spawning period from July to August. Biological minimum size of matured fishes containing mature oocytes is about 143.5mm in total length, which requires about 20 months after hatching. The ranges of total length by age are as follows : 0-ring group(floating stage), 30~70mm ; 1-ring group, 49.0~133.0mm 2-ring group, 128.6~167.0mm ; 3-ring group, 169.0~202.0mm ; 4-ring group, 200.7~240.0mm. The major food items of young fish under 8cm were copepods and invertebrate larvae, and those of adult fishes were annelids(polychaets) in winter, and bivalves and shrimps in summer and autumn. Therefore, it can be assumed that the population of C. joyneri could be reduced due to the decrease of food organisms caused by the continuous reclamation activities in the inner bays of the west coast of Korea.

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