First record of important biological parameters of Badis badis: A small indigenous species in Bangladesh

Abstract

A total of 286 Badis badis were collected from the Sutiyahali Reservoir in Mymensingh from January to December 2022, and their sex ratios, first sexual maturity, length-weight relationships and condition factors were evaluated. The weight and length of B. badis varied from 0.81 to 1.01g (0.89±0.30) and 4.08 to 4.60cm (4.36±0.31), respectively. Logistic curves depicting a sex ratio and 50% maturity (L50) estimated at 4.5cm for females and 4.05cm for males, as well as males reaching first sexual maturity with a shorter length than females. Regression coefficients in every month differ significantly (p<0.05), according to the regression equations. Each month, the values of the exponent b were less than 3 (b<3), with the highest value of b recorded in August (2.80) and the lowest value recorded in January (2.33). This led to a monthly negative allometric growth being seen. A strong positive relationship is evident from the coefficient of determination (r2) values, which ranged from 0.92-0.98 with an average of 0.961. During the study, the average condition factor (Kn) value for B. badis was found to be 1.02±0.13, which is a positive indicator of the fish's physical well-being. The condition factor values varied between 0.84 to 1.39, making it abundantly clear that B. badis are in good health and the waterbody is an ideal habitat for their survival. Relative condition factor (Kr) values, which varied between studies and ranged from 0.78 to 1.01, also exhibited a noteworthy difference (p<0.05). For its long-term management, the above findings will be very helpful.

First report on population dynamics and stock status of Badis badis in a wetland ecosystem (NW Bangladesh): Insights from new recorded maximum length

“…Information on B. badis population parameters are quite scarce in literature from Bangladesh and neighboring countries. A recent study was conducted on important biological parameters of B. badis [ 26 ]. As fisheries management relies on other factors, having specific data about population parameters like growth, death rates, and recruitment is crucial for the implementation of proper management policies [ [46] , [47] , [48] ].…”

“…The current study found that the b values for B. badis was below 3.00, indicating negative allometric growth. Previous research revealed that the b value varied from 2.25 to 2.80 in Sutiyakhali Reserve, Mymensingh, Bangladesh [ 26 ]. Similar growth patterns were noted by Kaushik et al [ 28 ] in their study on the Ranganadi River in Assam, India, which exhibited a b value of 2.96.…”

“…Maturity was observed in 50 % of the female specimen which measured 7.50–8.50 cm in TL and BW between 6.50 and 7.55g. In a recent study, the L m was determined 4.50 cm for female and 4.05 cm for male [ 26 ]. The length of first sexual maturity was higher than the recent conducted study.…”

“…Most studies on this species tend to focus on its taxonomy, behavior, and ecology rather than its economic significance in fisheries. Some available studies ( Table 1 ) have been conducted on this species, including intra-population diversity [ 17 ], genetic diversity [ 18 ], population and hierarchical genetic structure [ 19 ], genetic diversity and population differentiation analysis [ 20 ], analyses of genetic diversity [ 21 ], new record of Blue Perch [ 22 ], effects of carotenoid supplementation [ 23 ], feeding and reproductive biology [ 1 ], mosquito control [ 24 ], indigenous ornamental freshwater [ 25 ], biological parameters [ 26 ], length-weight relationships [ 27 , 28 ], and morphological characterization [ 29 ]. There are no previous studies on population dynamics and stock status of B. badis that have been carried out in our studied ecosystem of Bangladesh.…”