length-weight relationship and relative condition factor of red-toothed
trigger fish, Odonus niger
R. Mridula1*, K.M. Rajesh2, M.M. Meshram1
and K. Vandana3
Fisheries Resources and Management, College of Fisheries, Mangaluru – 575
Marine Fisheries Research Institute, Mangalore Research Centre, Mangaluru –
575 001, India
Fisheries Economics, Statistics and Extension, College of Fisheries,
Mangaluru – 575 002, India
*Corresponding Author Email : firstname.lastname@example.org
The study aimed to investigate the morphometric and meristic measurements,
length-weight relationship and relative condition factor of Odonus niger
landed along coastal Karnataka.
Methodology: The morphometric and meristic measurements,
length-weight relationship and relative condition factor (Kn)
of O. niger was studied for a period of eight months from August 2019
to March 2020. The different morphometric characters were subjected to
statistical analysis. The length-weight relationship was analyzed for both
the sexes (female and male) and combined data. Monthly relative condition
factor was analyzed for both the sexes and for different size group.
A comparison of different morphometric measurements exhibited good extent of
correlation indicating good extent of interdependence of these characters.
Four out of eight morphometric characters are environmentally controlled and
suggested wide range of zoogeographical distribution of O. niger. The
length-weight relationship is indicated as W = 0.046 L2.565, W =
0.044 L2.589 and W = 0.047 L2.561 with coefficient of
determination (r2) of 0.910, 0.913 and 0.910 for male,
female and combined sexes, respectively. The 'b' values of both the sexes
(male and female) exhibited negative allometric growth (p<0.05) and
appeared to be leaner. There was no significant (p<0.05) variation for relative
condition factor (Kn) among the months and size groups.
However, little higher values were observed during November and February.
Interpretation: The study fills the knowledge gap and
support for developing a suitable management system for this fish species.
Key words: Condition factor, Meristic characters, Morphometry,
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