| Summary: | The Dhir becl, one of the major live becls of the Brahmaputra basin, Assam, has anarea of 689 ha and is situated in Dhubli district of Assam. The dominance of fresh·watershari<., Wal/ago attu (8.10%) in the becl is a striking feature. Restricted breeding of W. attu. once a year from June to Septemebr ·was obsen'ed. The. mean obset'\'ed length was 37.5,65.0, 84.5 and 99.0 em in the 6th, 12th, 18th and 24th months of age respectively. The lengthgrowth coefficient (K), the asymptotic len!,Jfh (Loc ), and the arbitrary origin of the growthcurve (to), for W. attu were estimated to be 0.054484 per month, 136.16 em and 0.0355 monthrespectively. The calculated life span (Toe) of the fish is 123.86 months (about 10 years). Theweight growth parameters were estimated where the monthly growth coefficient (K), theas:vmptotic \Veight (Woc) and the arbitrary origin of' the growth cun'e (to) were found to be0.0743 j>er month, 7636,92 gram and 0.431908 month respectively. The length - weightrelationship follows the cube law
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