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Rhinomugil corsula (Hamilton, 1822) (Mugiliformes: Mugilidae) is the only representative of the genus Rhinomugil Gill, 1863, and is found in freshwater and brackish habitats. A study was carried out on R. corsula in the four major estuaries of Gujarat (Sabarmati, Mahi, Narmada and Tapi) from June 2017 to March 2018. A total of 680 specimens were examined (115-245 mm TL). Male R. corsula from all four estuaries showed positive allometric growth (b 3), while females had negative allometric growth (b 3). Length-weight relationships (LWR) of the four populations indicate that Mahi estuary has the best growing conditions for R. corsula, followed by Narmada and Tapi. Condition factor (K) estimates for females were 1.245 0.216 (Mahi), 1.269 0.243 (Narmada), and 1.231 0.138 (Tapi), while males had K values of 1.014 0.081 (Sabarmati), 1.226 0.274 (Mahi), 0.845 0.180 (Narmada) and 1.045 0.134 (Tapi). Assuming fitness of the population is high when K is close to 1, the males were more fit than the females in all four estuaries. Fitness of the male population was highest in Sabarmati estuary followed by Tapi, Narmada and Mahi. Females of Tapi estuary were more fit than in Mahi and Narmada. The present study provides information regarding biological aspects of the species which can be used in fisheries management and potential application by the aquaculture sector.
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