Abstract

The main aim of this study was to carry out the estimation of Length-Weight Relationship (LWR) and condition factor of five cultrinae fish species collected from Dianshan Lake, Shanghai, China investigated using specimens obtained from fishers. The sampling duration was from January to December 2013 by using fishing gears such as trawls and gillnets. Fish specimens were selected, morphometrically identified and measured. Specimens collected were stored in coolers containing ice then transported to the laboratory for further analysis. Fork length and body weight were measured using standard methods; the mean lengths and weights of the species were used for data analysis. Linear regression analysis was executed for the study of length-weight relationship W = aL_b and the respective exponential equations for LWR relationship are Chanodichthys erythropterus (W_t = 0.0065(FL)^3.2019); ^{Chanodichthys mongolicus} (W_t = 0.0022(FL) ^3.562); Hemiculter leucisculus (W_t = 0.1692(FL)1.7) ; Hemiculter bleekeri (W_t = 0.0059(FL)^3.0521) and Culter alburnus (W_t = 0.0014(FL)^3.7429). In the present study, the results revealed that Hemiculter bleekeri bleekeri showed an isometric pattern of growth (b ≈ 3); Hemiculter leucisculus showed a negative allometric growth pattern (b = 1.7); while Chanodichthys erythropterus, Chanodichthys mongolicus and Culter alburnus all exhibited positive allometric growth b≈3.2,3.6 and 3.7 respectively. Studies on condition factor revealed that the fluctuations in K values can be attributed to the spawning cycle as well as feeding intensity. The condition factor ranged from 0.746 (Hemiculter leucisculus) to 2.566 (Chanodichthys mongolicus). New maximum lengths for two species: Hemiculter leucisculus (72.9 cm) and Hemiculter bleekeri bleekeri (19.9 cm) are also reported.

Keywords:

Condition factor, Dianshan Lake freshwater fish, length, species and weight,

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