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Observations on Experimental Two-boat Bottom and Midwater Trawling in Gandhisagar Reservoir

K N Krishna Kartha, K. S. Rao

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Abstract

Among the two trawl designs employed for two-boat bottom trawling 12.50m dual purpose trawl caught 33.22% more fish than 12.50m large mesh high opening trawl. The increase in the average catch/h of fish is 60.53% in dual purpose trawl due to attachment of false head rope. The influence of trawling speed of 2-4knots, on the species wise catch composition of fish obtained during experimental two-boat bottom and midwater trawling is discussed.

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Among the two trawl designs employed for two-boat bottom trawling 12.50m dual purpose trawl caught 33.22% more fish than 12.50m large mesh high opening trawl. The increase in the average catch/h of fish is 60.53% in dual purpose trawl due to attachment of false head rope. The influence of trawling speed of 2-4knots, on the species wise catch composition of fish obtained during experimental two-boat bottom and midwater trawling is discussed.

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Available abstract

Among the two trawl designs employed for two-boat bottom trawling 12.50m dual purpose trawl caught 33.22% more fish than 12.50m large mesh high opening trawl. The increase in the average catch/h of fish is 60.53% in dual purpose trawl due to attachment of false head rope. The influence of trawling speed of 2-4knots, on the species wise catch composition of fish obtained during experimental two-boat bottom and midwater trawling is discussed.

Key concepts: Trawling, Bottom trawling, Fishery, Fish <Actinopterygii>, Rope, Bycatch, Environmental science, Marine engineering

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