Dry-season spawning in a cyprinid fish of southern India |
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Authors: | Sekharapillae Harikumar Koduvayoor G. Padmanabhan Puthanvettil A. John Koenraad Kortmulder |
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Affiliation: | (1) Department of Aquatic Biology and Fisheries, University of Kerala, The Aquarium, Trivandrum, 695007, India;(2) Department of Zoology, University of Leiden, Post Box 9516, 2300 RA, Leiden, The Netherlands |
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Abstract: | Synopsis A population of the S. Indian cyprinid fishBarbus melanampyx was sampled monthly through 24 months. Seasonal cycles of the gonado-somatic index (GSI), ovarian stages, male breeding tubercles, spawning behaviour and population structure were assessed. These fish breed strictly seasonally during the main dry period: December/January through April. Comparison with other Barbus species of the same general region led to the conclusion that the patterns of reproductive investment ofB. melanampyx are similar to those of perennial species, and different from those of wet-season spawners. The reasons for this rather unexpected result were found in the more constant conditions prevailing during a dry season as compared to the monsoon. It was argued thatB. melanampyx and the species spawning perennially are in effect small-brood spawners, rather than partial spawners. |
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Keywords: | Reproductive biology Tropical freshwater fish Adaptations to seasonal spawning Barbus melanampyx |
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