Environmental Engineering Reference
In-Depth Information
16
Length-Weight Relationship
and Condition Factor in
Channa
punctatus
(Bloch)
from Hussainsagar Lake,
Hyderabad, Andhra Pradesh, India
S. Anitha Kumari and N. Sree Ram Kumar
Abstract
The present study describes the length-weight relationship and condition
factor in
Channa punctatus
(Bloch) from Hussainsagar lake, Hyderabad
A.P. The work was carried out on 200 ishes ranging from 15 to 30 cm in
length. The value of correlation coeficient was calculated to be 0.991
indicating a high degree of correlation between the length and the weight.
The parabolic and regression equations were found to be
w
= 0.03273
L
2.621
and log
W
= −1.485 + 2.621 log
L
, respectively. Deviation in the cube law
was observed, and the condition factor showed continuous decrease with
increase in length indicating a physiological response of the ishes to
different environmental conditions of the lake waters.
Keywords
Length-weight•
Channa punctatus
•Fish•Hussainsagarlake
model between the length and the weight so as to
derive one from the other (Beverton and Holt
1957
; Wooton
1990
) and, secondly, to compute
the departure from the expected weight for length
of the individual ish or a group of ishes as an
indicator of fatness or degree of well-being of
ish. This relationship is called the condition
factor (Wooton
1990
).Further,thelength-weight
relationship inds signiicance in the assessment
of the growth of ish in different environments
(Mirza et al.
1988
). Many reports are available on
the study of length-weight relationship of ishes
subjected to pollution stress. Hence, the present
study was undertaken to estimate the length-
weight relationship and condition factor so as to
Introduction
The study of length-weight relationship is an
important tool in ishery biology, and according
to Lecren (
1951
), it is pursued with two
objectives: irstly, to describe the mathematical
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