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Butis butis/ crazy fish belongs to the family Gobiidae, often found around the waters in mangrove forest area which is a permanent resident fish. Coastal community Belawan more familiar with the name of butuh keleng or gabus malas, because this fish is often found always hanging on the leaves and branches that carry the mangrove. This research aims to know the size and pattern of fish growth need keleng in the waters of Sungai Belawan. The research done is explorative. Sampling using fishing gear, using a bait of peeled shrimp peel. Arrest was carried out when the water was retroactive between 08.00-11.30 am. Analyze data using Microsoft Excel application 2010. Based on the fish catch for the size class obtained by a small size 26 individual, medium size 5 individual, and large size 2 individual. The captured Crazy Fish growth pattern, showing the equation value W = 0,3514 L0,3235 and R2 = 0.952. Thus the long relationship of crazy fish in the Belawan River is negative alometric. Correspondence: e-mail: khairulbiologi75@gmail.com

SIZE CLASS AND PATTERN GROWTH OF CRAZY FISH (BUTIS BUTIS) AT BELAWAN RIVER