マコガレイおよびヒラメ種苗の潜砂能力と底質選択〔英文〕

概要

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The burying ability and grain size selection of hatchery-reared marbled sole and Japanese flounder juveniles were studied using sand of various grain sizes. Sand obtained from fishing areas were categorized into six grain-sizes: ?? 0.125mm, 0.125 ?? 0.25mm, 0.25 ?? 0.5mm, 0.50 ?? 1.0mm, 1.0 ?? 2.0mm and 2.0 ?? 2.83mm. The buried area was visually measured. Marbled sole juveniles from all three size groups (The means of the total lengths were 35.0, 58.7 and 80.6mm.) were able to bury themselves in sand consisting of grains smaller than 1mm in diameter. However, in sand with a diameter larger than 1mm, only the 80.6mm group was able to bury themselves. Thus, the burying ability increased with growth. Sands of two different grain sizes were laid on both halves of the bottom of the container. Marbled sole (35.0mm TL) and flounder (55.7mm TL) preferred medium grain sizes, 0.125 ?? 0.5mm in diameter. A positive correlation between the preference index and the buried area was found in both species. It is suggested that the juveniles preferred the type of sand in which they can bury themselves most easily.
日本水産學會の論文