トゲノコギリガザミ成雌の卵巣卵径と産卵までの積算水温の関係

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タイトル別名
  • Relationship between Ovarian Egg Diameter and Cumulative Water Temperature to Spawning in Laboratory-Reared Mud Crab, Scylla paramamosain Estampador (Brachyura,Portunidae)
  • トゲノコギリガザミ セイシ ノ ランソウランケイ ト サンラン マデ ノ セキサン スイオン ノ カンケイ

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This study was conducted to predict spawning and control it in the mud crab, Scylla paramamosain. Pre-mated females were obtained from Urado Bay, Kochi Pref., and reared in tanks at 16-17°C during the overwintering period. Ovarian egg diameter (OED) and the gonad-somatic index (GSI) were examined using 30 females; data sets of OED by biopsy and the cumulative water temperature (CWT) to spawning were determined for 35 females. The relationship between OED and GSI is expressed as: GSI=0.0005OED1.7647 (n=30, R2=0.9148, P<0.001) . Therefore, it is considered that OED represents the degree of ovarian development because GSI increased with increase in OED. The CWT decreased exponentially with increasing OED: the relationship between OED and CWT is expressed as: CWT=7.8×1023OED-8.3872 (n=35, R2=0.5665, P<0.001) . These indicate that timing of spawning can be estimated by measuring ovarian egg diameter of the mud crab, Scylla paramamosain. However, CWT tended to fluctuate largely under 360μm of OED.

収録刊行物

  • 水産増殖

    水産増殖 51 (2), 173-177, 2003

    日本水産増殖学会

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