Length‐weight relationships of ornamental fish species from Amanã Lake, Amanã Reserve, Amazonas, Brazil

Abstract

Length‐weight relationships (LWRs) were estimated for 16 ornamental fish species from Amanã Lake and nine tributary streams, in Central Brazilian Amazonia. Sampling was carried out bimonthly for a year (2007–2008), using two sets of four gillnets (20 m × 2 m, 2,5; 3,5; 04; 4,5 cm stretch mesh size); trawls were performed with seine nets (35 m × 6 m, 3 mm stretch mesh size); native fish‐traps (fyke‐net like fish‐traps woven from local lianas), and dip nets (0.5 m × 0.5 m stretch mesh size). Measurements were done for standard length (SL – 0.1 cm precision) and total weight (Wt – 0.01 g precision). This study provides information on the length–weight relationships for all sampled species and, in addition, provides new maximum standard lengths for six species.

Length–Weight Relationships and Diversity Status of Fishes in the Midstream of the Jialing River, a Tributary of the Upper Yangtze River, China

“…LWRs were proposed by Keys [16] and have been widely used in fish growth and stock dynamic studies. For example, Hercos [17] researched the length-weight relationships of ornamental fish species from Amanã Lake, Brazil and proposed that the data not only comprised important information on population and community ecology, but can also serve as a baseline for local ornamental fish trade management. However, fundamental data of the LWRs for fishes in the Jialing River are not available and few fish species (Gnathopogon herzensteini, etc.)…”