Predatory association of Aeolidiopsissp. on Palythoa mutuki (Haddonand Shackleton, 1891) along Gujaratcoast, India
2019
Fishery, population characteristics and stock estimates of grouper
with special reference to Epinephelus malabaricus from Tuticorin
were carried out during 2015-2017. Among the groupers, E.
malabaricus was the dominant resource contributing 42.2%, with
an annual average production of 420t along this region. The
asymptotic length (L∞), growth coefficient (K) and arbitrary origin of
growth (t0) were estimated at 99.75 cm, 0.53 y-1 and 0.18
respectively. The mortality parameters, the instantaneous total
mortality rate (Z), fishing mortality (F) and natural mortality rates (M)
were estimated at 1.14 y-1, 0.62 y-1 and 0.52 y-1 respectively. The
recruitment season was during April to August. The length structured
virtual population (VPA) analysis revealed a heavy fishing pressure
on length group between 40 and 55cm and there is no sign of
recruitment over-fishing in this region. The estimated maximum
sustainable yield (MSY) and annual catch were 384 t and 420 t
respectively. E. malabaricus was optimally exploited as the
exploitation ratio (E) was 0.54 but the study infers that further
increase in effort may have a detrimental effect on the stock of this
species. The results of this study will serve as baseline information
for formulating future management measures for the resource along
the coast.
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