Length-weight and length-length relationship of three species of snakehead fish, Channa diplogramma, C. marulius and C. striata from the riverine reaches of Lake Vembanad, Kerala, India

  • Ali A
  • Dahanukar N
  • Raghavan R
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Abstract

Abstract: The length-weight relationship (LWR) and length-length relationships (LLR) of three snakehead fishes, Channa diplogramma, C. marulius and C. striata, exploited by small-scale fishers in the riverine reaches of Lake Vembanad, Kerala were studied using the allometric growth equation Y = aXb . Our analysis shows that the LWR of C. diplogramma and C. marulius is nonisometric with exponents much smaller than the cubic value (b = 3), while that of C. striata is isometric. Channa marulius showed a definite change in LWR with size, with smaller fish growing with positive allometric exponents (b > 3) and larger individuals having negative allometric relationship (b < 3), indicating a possible age-related change in growth pattern. In the case of LLR, all three snakehead species showed non-isometric growth patterns. The caudal fin did not grow substantially with increasing fish length.

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APA

Ali, A., Dahanukar, N., & Raghavan, R. (2013). Length-weight and length-length relationship of three species of snakehead fish, Channa diplogramma, C. marulius and C. striata from the riverine reaches of Lake Vembanad, Kerala, India. Journal of Threatened Taxa, 5(13), 4769–4773. https://doi.org/10.11609/jott.o3353.4769-73

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