Lengths, length-length relationships and condition factor of Indian catfish Gagata cenia (Hamilton, 1822) from the Padma River, Bangladesh

Abstract

This study described some biological parameters including lengths, length-length relationships and Fulton’s condition factors of Gagata cenia in the Padma River of Bangladesh, based on 1120 specimens collected from May to November, 2012. Maximum 39.78% female fishes were belonging to the length category of 55-60 mm whereas 51.06% male were belonging to 50-55 mm. The highest mean total lengths were found 66.51±10.28 mm (combined sex), 70.12±09.49 mm (female) and 61.08±09.45 mm (male) in the month of June. Similar findings are also presented for standard length, fork length, body depth, dorsal length, pectoral length, pelvic length and anal length. Linear relationships were also studied among mentioned lengths. Strong positive correlations were observed in all cases. Speraman’s Rank test indicated that there was a strong, positive correlation between total length and condition factor in female, which was statistically significant (rs=0.210, P=0.044). In male, there was no significant correlation between these two (rs=0.167, P=0.262). The Mann-Whitney U-test showed that the female individuals had the highest condition factor (Mean rank of 79.76). There was a statistically significant differences in the Fulton’s condition factor between males and females (two tailed, Mann-Whitney U = 1324).

Parameters associated with growth factors of five fish species in the Atrai River, Dinajpur, Bangladesh

“…Form factor (a 3.0 ) was used to discern body shape of a fish or population from others. To the best of knowledge, it was not possible to judge the present findings against others due to lack of literature on condition (except CF f of G. cenia by Chaki et al 2013; S. bacaila by Masud and Singh, 2015) and form factors (a 3.0 ). The present mean values of TL and BW are higher than the values for A. jaya (2.75-7.81 cm and 0.14-3.67 g, Kaushik et al, 2015) relative body weight; n, specimen size; ns, not significant at any level; **, highly significant at 1% level (p < 0.01); *, significant at 5% level ( p <0.05) Table II.…”

“…The present CF f value of G. cenia (0.74±0.005) is out of range (1.62±0.28 to 2.01±0.26) report by Chaki et al (2013) may be due to food staff and gonad maturation (Gupta et al, 2011). BW r is used to know the prey availability, food abundance and sexual maturity of fishes (Anderson and Neumann, 1996).…”

“…Based on Spearman rank test, CF f was significantly (p < 0.01 or < 0.05) associated with BW for G. cenia, G. youssoufi and S. phulo (p < 0.01 or < 0.05), but not for A. jaya and S. bacaila. TL, SL and BW s were correlated (p < 0.01 or < 0.05) with CF f only for S. bacaila excluding other fishes which was differed for G. cenia (Chaki et al, 2013) may be due to temporal and sexual variations. Again, BW r was significantly (p < 0.01 or < 0.05) interrelated with BW for all fishes except S. bacaila while no significant relationships were observed with lengths (TL and SL).…”

“…The Atrai River, major river in Dinajpur district of Bangladesh, is a suitable ground for 74 freshwater fishes (Chaki et al 2014) where Aspidoparia jaya, Gagata cenia (Hamilton 1822), G. youssoufi (Rahman 1976), Salmophasia bacaila (Hamilton 1822) and S. phulo are common native species. Therefore, aim is to explore sufficient information on CF f , BW r and a 3.0 for these small fishes (except G. cenia reported by Chaki et al, 2013) in the Atrai River which might be helpful as a guidance future research workers.…”

A preliminary study on fish fauna of the Passur River in Bangladesh

“…Among them, some species are commonly found in many water bodies of the country (for example, Gagata sp.) Chaki et al, 2013). Global conservation status of the fish species are shown in Figure 4.…”