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NISCAIR PUBLICATIONS >
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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(1) [February 2011] >
| Title: | Population dynamics of Bombay duck Harpadontidae nehereus (Ham. 1822) (Teleostomi / Harpadontidae) from Mumbai waters, India |
| Authors: | Balli, Johnson J.
Chakraborty, S K
Jaiswar, A K |
| Keywords: | Population dynamics
Growth parameters
Mortality parameters
H. nehereus |
| Issue Date: | Feb-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Growth parameters were estimated for H. nehereus are  =434 mm, K= 0.81 / yr and to= 0.0406 yr. Total, natural
and fishing mortality were estimated as 4.33, 1.30, and 3.03 respectively. The
M/K ratio was found to be 1.60. Length at first capture was found as at the place
of found 210 mm. Present exploitation ratio (E) was calculated as 0.70.
According to knife edge selection, the optimum E should be 0.66 at which at
least 20% of virgin biomass is still available for exploitation. However, the
catch has declined and mesh size regulation is difficult to implement as the
dol net is a multispecies gear. One of the best measures for the fishery to sustain
is by fishers themselves is that they suspend fishing activities when the catch
is poor and non-remunerative. |
| Page(s): | 67-70 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.40(1) [February 2011]
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