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The biology and population dynamics of the spadenose shark Scoliodon laticaudus in the coastal waters of Maharashtra State, India

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Relation http://eprints.cmfri.org.in/194/
 
Title The biology and population dynamics of the
spadenose shark Scoliodon laticaudus in the
coastal waters of Maharashtra State, India
 
Creator Mathew, C Joseph
Devaraj, M
 
Subject Population Dynamics
 
Description The study of the biology and dynamics of Scoliodon laticaudus indicates a fast
growth of 21.8 cm, 54.5 cm and 65.5 cm, in the first, second, and third year
respectively. The von Bertalanffy growth equation was fitted to the above
values for which the parameters calculated (on an annual basis) were : K =
0.6812, L^ = 74.023 cm, T_ = 12 years and t„= -0.01 year. The maximum length
of this shark in the Mumbai waters is about 66 cm (3.1 years). The weight
growth parameters (on an annual basis) for sexes combined by the VBGF are
K = 0.5823, W_ = 1756.93 g, t^ = 0.0032 year. The length at birth is 14 cm
with a gestation period of 4 months. The ovarian and uterine cycles operate
concurrently with broods being released once a month. The average fecundity
was 11 embryos per female. The LJL^ was estimated to be 0.47 - 0.54. Scoliodon
laticaudus is an active carnivore with a mixed diet composing of small
sized teleosts, prawns, squilla and molluscs. There is no evidence of
cannibalism. The study of the dynamics of Scoliodon laticaudus indicates that
the stock is exploited at its optimum level. Therefore any increase in effort
from the present level may not increase the yield and it is advisable to sustain
the effort at the present level. For the sharks (all species combined) and the
elasmobranchs there is still some scope for increasing the effort in order to
reach the MSY level.
 
Publisher CMFRI/ICAR
 
Date 1997
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/194/1/Article_04.pdf
Mathew, C Joseph and Devaraj, M (1997) The biology and population dynamics of the spadenose shark Scoliodon laticaudus in the coastal waters of Maharashtra State, India. Indian Journal of Fisheries, 44 (1). pp. 11-27.