RELATIONSHIP BETWEEN STANDRAD LENGTH AND PREFERRED WATER VELOCITY ON FRESHWATER FISH FOR NATURALLY DIVERSE RIVER CONSTRUCTION METHODS

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  • 魚の住みやすい川づくりに資する魚類の生息分布とその場の流速
  • サカナ ノ スミヤスイ カワズクリ ニ シスル ギョルイ ノ セイソク ブンプ

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Abstract

Distribution of Squalidus chankaensis biwae, Lepomis macrochilus LAFINESQUE, Rhinogobrus brunneus, Tribolodon hakonensis and Zacoo platypus within the habitat was strongly influenced by in-situ water velocity. For example, larval fish of Squalidus chankaensis biwa, 6-20mm in SL. preferred swimming a water velocity of 0-2cm/sec at the water surface. Similarly, juvenile fish, 30-40mm in SL. preferred a water velocity of 4-5cm/sec. But the preferred water velocity for adult fish ranged from 5-25cm/sec near the bed of the stream. Similarly, adult fish of Zacco platypus was 40-90cm/sec. The other kinds of fish too, it was measured similar phenomenon. Mostly freshwater fish until juvenile period preferred a water velocity of 0-5cm/sec at the water surface near aquatic plants, but in the beginning of adult fish period, preferred water velocity was made great magnification and fish has habitabled at the near bed-pebbles of swift curreent. These data are important to the design of good fish habitat.

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