Effectiveness of punching as a new method of marking for juvenile spotted halibut <i>Verasper variegatus</i> based on the small regenerated scales on the ocular side

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  • SHIMIZU DAISUKE
    Tohoku National Fisheries Research Institute, Fisheries Research Agency
  • FUJINAMI YUICHIRO
    Miyako Laboratory, Tohoku National Fisheries Research Institute, Fisheries Research Agency
  • AONO HIDEAKI
    Tohoku National Fisheries Research Institute, Fisheries Research Agency

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  • ホシガレイの小型再生鱗を指標とするパンチング標識の有効性
  • ホシガレイ ノ コガタ サイセイ ウロコ オ シヒョウ ト スル パンチング ヒョウシキ ノ ユウコウセイ

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Abstract

We examined the effectiveness of punching based on the small regenerated scales on the ocular side as a new method for the external marking of spotted halibut Verasper variegatus and compared it with conventional branding. Juvenile spotted halibut (9.8 cm in total length) were individually marked by punching from the ocular side or branding from the ocular or abocular side, and the wound healing process was observed. Results showed the presence of small regenerated scales in all experimental groups that did not disappear two years after marking. Less variation in perforation diameter was observed on the ocular side after punching, and punching demonstrated the highest distinguishability rate. No mortality or growth suppression was observed due to punching. The mean rate at which juveniles could be marked by punching was 504 individuals per hour per worker. Therefore, punching was more effcient than the other marking and tagging methods. These results show that punching could be a useful method for marking juvenile spotted halibut for seed stocking.<br>

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