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VOL. 11, ISSUE 2 (2026)
Seasonal impact on length-weight relationship and condition factor of Mystus dibrugarensis: A focus on gender differences
Authors
Bhenila B
Abstract

Length-weight relationships (LWRs) and relative condition factors are of great importance in fisheries management for comparative growth studies since it provides information about the growth of the fish and well being of the species. In the present study LWRs for Mystus dibrugarensis collected from the Dihing River were established, and their growth condition was evaluated. The results indicated that almost all captured specimens exhibited a negative allometric growth. The exponential value b was found significantly less than 3 in both sexes that indicates the rate of increase in body length is not proportional to the rate of increase in body weight. LWR was calculated separately for both sexes. From the study, it was observed that the regression coefficient of females is found to be higher than the male. From this trend, it may be presumed that the female of M. dibrugarensis gained more weight with an increase in length than the male. This study was also conducted with respect to different seasons. The intercept ‘a’ of all the seasons and all the length groups was found to be negative for M. dibrugarensis, indicating a perfect linear relationship between length and weight. Correlation coefficients (r value) were found to fluctuate in different months in different sexes. Seasonally female showed better correlation than males.

Condition (K) value increased proportionately with the length of the fish. It was observed that the highest K value was found in smaller fishes. Seasonally higher K value during pre-monsoon and monsoon months (spawning months) was mainly due to the maturity of gonads in both sexes. Condition factor in female M. dibrugarensis was found to increase during the breeding season, i.e., from March onwards, and reached a peak in June, and again it dropped down in August when spawning activity was over.
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Pages:367-372
DOI:
https://doi.org/10.66856/ijer.2026.11.2.11186
How to cite this article:
Bhenila B "Seasonal impact on length-weight relationship and condition factor of <i>Mystus dibrugarensis</i>: A focus on gender differences". International Journal of Entomology Research, Vol 11, Issue 2, 2026, Pages 367-372
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