Development of lip protrusion in trahira, Hoplias malabaricus (Bloch, 1794), associated with aquatic surface respiration

Collection: Pensoft Publishers

Keywords: Drylands · Topics: Fish Biology and Ecology Studies, Fish Ecology and Management Studies, Aquaculture Nutrition and Growth

The histological organization of labial development of trahira Hoplias malabaricus found in a drying pool was compared with normal fish from a similar environment. It was found that labial development was not associated with any visible histological change in key tissues. We hypothesize that the fish had been recently trapped in the pool (for a few weeks) and did not have the time to respond to the stressful conditions, and that the labial development was not associated with increase in respiration surface area but rather may serve to channel oxygen-rich surface water more efficiently into the mouth chamber.

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