Long whiskered catfish, Mystus gulio (Hamilton, 1822), is an omnivorous bagrid fish which is distributed along the shores Bangladesh,

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The study was to examine the effects of dietary L. aspera on growth performance, physio-metabolic response and health status of Rita rita fish reared in tanks for 60 days. Six experimental diets were formulated containing 0 g/kg, 3 g/kg, 6 g/kg, 9 g/kg and 12 g/kg L. aspera and designated as D0, D3, D6, D9 and D12 respectively.The inclusion of L. aspera at graded levels resulted in significantly varying effects on growth performance where the weight gain (%), specific growth rate (SGR) and feed conversion efficiency (FCE) were significantly higher (p<0.05) in D6 and D9 groups than others. The protease and amylase activities were elevated in L. aspera supplemented groups than the control group (p<0.05), whereas lactate dehydrogenase, malate dehydrogenase and serum transaminase enzyme activities were significantly reduced with the increasing level of L. aspera and comparatively higher activities of the respective enzymes were found in the control group. The activities of oxidative stress enzymes were significantly higher (p<0.05) in the D9 group and lower in control. The blood glucose level significantly decreased with the increasing level of L. aspera in the experimental diets. The L. aspera supplemented fish had significantly higher liver glycogen, serum protein, albumin and globulin than control group. Red blood cell count was significantly higher (p<0.05) in D6-D12, whereas white blood cell count and haemoglobin content were significantly higher (p<0.05) in D6 and D9 groups. Regression analysis showed that L. aspera at the level of 7.3-7.9 g/kg is optimum for better growth and feed efficiency.

The present study was carried out to established the relationship of total length and total weight, the relationship of total length (TL), standard length (SL), and fork length (FL) and also condition factor of native fish species Labeo bata from Kolong River of central Brahmaputra valley of Assam. A total of 334 specimens were collected for this present study from May 2018 to April 2019. The length-weight relationship (LWR) was calculated separately with male, female, and pooled data and growth was shown negative allometric (b<3). The length-length relationship (LLR) showed a linear significant relationship between total length and standard length, total length and fork length and standard length and fork length. Information on the length-weight relationship, length-length relationship and condition factor of Labeo bata from central Brahmaputra valley are quite limited. There is no such information of LWRs, LLRs, and condition factor of this fish species from this area so this result which would be helpful for scientific and sustainable management of Indian minor carp fisheries in the Kolong River of central Brahmaputra valley of Assam.

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