A Bottom-Net to collect Zooplankton Living Close to the Sea-Floor

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  • 底棲プランクトン採集器「そりネット」

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A description is given of a simple bottom-net designed to collect zooplankton from the immediate vicinity of the sea-floor. The gear consists of a net, sled, and releasing equipment. The net has 70 cm by 70 cm in opening square and 350 cm long, and is towed on sandy or muddy bottom at a speed of 1.5 to 3.5 knots. Besides a number of new mysids and decapods, some rare crustacea species were collected in Sagami and Suruga Bays. They have hardly been obtained by ordinary plankton tow-nets. An epiplanktonic chaetognath Sagitta nagae was abundant on the sea-floor of 20 m depth in the daytime.

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