Length-weight relationships (LWR) were estimated for four fish species caught in the Tucuruí Lake Conservation Units Mosaic (03°48'15.7"S, 049°033'033,3"W; 04°13'18.2"S, 049°041'038.5"W and 04°17'57.1"S, 049°026'006.3"W). The samples were collected trimonthly between March 2013 and December 2014, using seven different gill nets (20 × 3.0 m; mesh size: 4, 6, 8, 10, 12, 14, and 16 mm between opposing knots) spending for twelve hours per day.
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