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

Abstract

For evaluation of Fulton's condition factor (CF f ), relative body weight (BW r ) and form (a 3.0 ) factor affecting growth, 5 fishes (Aspidoparia jaya, Gagata cenia, G. youssoufi, Salmophasia bacaila and S. phulo) were collected from the Atari River in Dinajpur district of Bangladesh. Significant differences (p < 0.05) were recorded among the values of CF f (0.47-1.56) but not for BW r (79.60-128.39). Based on CF f values, analysis of similarities (ANOSIM, p < 0.01) revealed that maximum distances (R = 0.9946) were found between G. youssoufi and S. bacaila while lowest (R = 0.2175) between G. cenia and S. phulo. Using two-dimensional nMDS scaling of CF f and BW r , G. youssoufi showed good health condition (CF f = 1.22±0.01; BW r = 100.63±0.79) and were separated (stress = 0.0003) from other fishes. Lowest a 3.0 value was noted for S. bacaila (0.004) and highest for G. youssoufi (0.012). Therefore, G. youssoufi showed healthier and former body with more adaptability in this river than those of others. These are the first records for proper management of above mentioned fish species and future research in the near future.

Evaluating biometric indices for Indian Gagata, Gagata cenia (Hamilton, 1822) through multi-model inferences

“…According to Froese [ 57 ]; prohibiting catching first mature fish and letting them grow up to optimum length of 6.0 cm and greater than 5.5 cm size fish as well as 6.0–6.5 cm size group of G. cenia are suggested for exploitation. Comparing this value with the calculated L m of other water bodies, it’s found that the values are almost similar to the calculated value of the Atrai River, Dinajpur, Bangladesh [ 32 , 36 ] and Payra River, Bangladesh [ 33 ], but is much lower than the calculated value of the Ravi River, North-western India ( Table 5 ), which may be attributed to the geographical variation. Tactlessly, this research conveys the first effort to estimate the size at sexual maturity and optimum catchable length for this fish, hence comparisons with other findings will be required in the future.…”

“…Froese [ 42 ] suggested, the form factor assists to check whether or not the body form of individual fish in a particular population or else explicit species is considerably divergent from others. In this current study, the a 3.0 value was 0.0172 while Islam and Azom [ 36 ] reported a 3.0 value of 0.008 for this species from the Atrai River, Dinajpur, Bangladesh. The assessed a 3.0 for the population of G. cenia was inside the cutoff points 0.0172–0.0193 narrated by Froese [ 42 ]; proposing short and deep body shape in the Jamuna River.…”

“…The a 3.0 was observed as 0.0172 for combined sexes of G. cenia in the Jamuna River and the estimated value signifies this fish is short and deep in body shape. Furthermore, using existing data, a 3.0 of G. cenia obtained from different waters around the world was calculated and represented in Table 5 [ 32 – 36 ].…”

“…It was not feasible to sample G. cenia smaller than 2.7 cm in TL in this study, which might be owing to a lack of smaller individuals in the fishing grounds or the selectivity of fishing gears [ 18 , [60] , [61] , [62] , [63] ] and additionally since smaller fish is thrown away by the fishers [ 64 , 65 ]. Besides, the maximum size of G. cenia was recorded as 8.5 cm TL which is lower than the maximum recorded value of 15 cm SL [ 4 ] and also recorded (11.7 cm TL) from Payra River, Bangladesh [ 33 ]; however higher than 7.3 cm TL by Islam and Azom [ 36 ]. The consistency could be due to the choice of fishing gear or simply because the fishers did not go to the spots with larger fish [ 18 , 66 ].…”

“…Only few studies have been done on this species from different water bodies such as length-weight and length-length relationships by Islam and Mia [ 32 ] from the Atrai River, Bangladesh; [ 33 ] from the Payra River, Bangladesh; Nahar et al [ 34 ] from the Ravi River, India; condition factor Sharma et al [ 35 ] from the Padma River, Bangladesh; and parameters associated with growth factors [ 36 ] from the Atrai River. Nonetheless, a study on G. cenia from the Jamuna River in detail [ 3 ] has not been carried out yet.…”