Abstract
Assessment of length-weight relationship (LWR), length-length relationship (LLR) and condition factor was carried out for Bangana dero in northeastern India, mainly from the Brahmaputra and Irrawaddy (Manipur) River system. We report a value of ‘b’ 3.1269 and 3.1426 for LWR with respect to total length and standard length respectively, indicating positive allometric growth. The value of ‘b’ for LLR is less than one, which indicates that growth in total length is less with per unit increase in standard length. The value of ‘K’ and ‘Kn’ is 0.91 and 0.72 depicts normal well being of fish in its habitat.
Highlights
The inland fisheries sector of the country shares more than 50% of the total production
The length-weight relationship (LWR) for B. dero is assessed for total length and standard length separately in relation to total weight
Depending on the value of ‘b’ of LWR, the growth in fishes can be said as isometric (b = 3), positive allometric growth (b > 3) and negative allometric growth (b < 3) (Tesch 1971; Ricker 1975); LeCren’s Cube Law states that the value of ‘b’ remains 3 for ideal fish and follows isometric growth
Summary
The inland fisheries sector of the country shares more than 50% of the total production. The significance of length-weight relationship (LWR) relies on the estimation of relationship between weights at different size of fish It is useful in assessing the normal well being of fish under different physiological, climatic and environmental conditions to evaluate the ontogeny of fish stocks of different regions (Anwa-Udondiah & Pepple 2011). The condition factor describes the degree of robustness or plumpness of fish to determine whether fishes are in better or poorer condition (Koushlesh et al 2017). It depends on physiological features such as maturity, spawning and food availability
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