Phytoplankton-periphyton orientation influences feeding behavior of cultivable species: A case study on rohu, Labeo rohita (Hamilton, 1822)
Phytoplankton-periphyton orientation and L. rohita
DOI:
https://doi.org/10.5281/zenodo.11061708Keywords:
Indian major carp, periphyton-based aquaculture, substrate, sustainable aquacultureAbstract
The Indian Major Carp, Labeo rohita was stocked in four different resource environments namely, Periphyton monoculture, Periphyton polyculture, Plankton monoculture, and Plankton polyculture. Bamboo substrates were used as periphyton colonizers in culture ponds. In polyculture stocks, the Catla catla and Cirhinus mrigala were used as companion crop. The on-farm experiment was conducted for 210 days, and gut contents of rohu were collected and analyzed throughout the stocking period. The gut abundances of rohu showed an inclination towards algal food organisms, especially Cyanophyceae, Chlorophyceae, Baccillariophyceae, and Eugelophyceae, towards the later period of stocking when the fish attains a considerable total length. Results from the Shanon Diversity index supported higher algal diversity in the fish gut in periphytic conditions. The Diet breadth index also clearly indicated that rohu has a strong preferences towards periphyton than plankton. Such preferences are more prevalent in polyculture than in monoculture conditions. In conclusion, it can be accepted that rohu has clear preference towards periphyton over plankton when it is available in the environment. Stocking of other planktonic feeders in polyculture conditions may have no impact on the feeding pattern of rohu if periphytic resources are made available in the environment.
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