OCCURRENCE AND SIZE AT MATURITY OF THE DEEP-SEA LITHODE CRAB, PARALOMIS VERRILLI(BENEDICT), IN THE EASTERN OKHOTSK SEA

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  • 東部オホーツク海におけるゴカクエゾイバラガニ,PARALOMIS VERRILLI(BENEDICT),の出現と成熟サイズについて
  • トウブ オホーツクカイ ニ オケル ゴカクエゾイバラガニ Paralomis

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Abstract

A total of 245 deep-sea lithode crabs, Paralomis verrilli was captured by sampling trawl nets and crab pots at depths ranging between 580 and 870 m in the eastern Okhotsk Sea. The environmental temperature ranged from 1.1℃ to 2.2℃ and comparable temperature m neighboring 200〜400 m depths water ranged from -1.3℃ to 1.4℃. Relative growth of P. verrilli was examined based upon measurements in 32 males and 37 females. The relative growth of appendages shows that there are differences in the growth rates between male and female crabs after they have reached 53 to 65 mm in carapace width suggesting that the crabs become mature when they attained about 60 mm in carapace width. Mature females have from 2000 to 7800 fostering eggs attached to their abdominal appendages. The relationship between carapace width X and number of fostering eggs Y can be expressed as Y=0.05804X^<2.4833>. Twelve crabs out of 36 mature females captured in early June had fostering eggs at the late nauplius stage and the others had younger fostering eggs newly spawned and the crabs in this waters seems to have their spawning season from April to June.

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