Investigations on unexplored brachyurans (Decapoda), Charybdis hoplites (Wood-Mason, 1877) and Charybdis smithii MacLeay, 1838, from trawl discards of the Southeast Arabian Sea ecosystem

in Crustaceana
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Abstract

The effectiveness of GIS-based resource mapping to strengthen the database for Ecosystem-Based Fisheries Management (EBFM), was tested in an attempt at resolving the existing gap in the data on non-commercial resources. In this paper we describe the result of that try by giving an example of one of the most important influential species in the benthic ecosystem of the Southeast Arabian Sea (SEAS). An estimated 2803 t of Charybdis hoplites, a relatively little known species from the coast, are yearly caught and discarded by trawlers operating from the Mangalore fisheries harbour. A GIS-aided study on distribution and abundance estimated, that the average biomass of the species is 322.7 t, at any time in the area covered. This study brings out the fact that a number of non-commercial biota are serving as non-detectable factors in sustaining productivity. The identification of their role and the quantification of their biomass thus constitute important data for an effective implementation of EBFM.

Investigations on unexplored brachyurans (Decapoda), Charybdis hoplites (Wood-Mason, 1877) and Charybdis smithii MacLeay, 1838, from trawl discards of the Southeast Arabian Sea ecosystem

in Crustaceana

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Figures

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    Map of the southwestern part of the coastline of India, showing the area in the Southeastern Arabian Sea (SEAS) that encompasses the fishing grounds and that was selected for this study.

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    Frequency of days of occurrence of the various crab species in the trawl catch during 2009-2012. The species found were: Portunus pelagicus (Linnaeus, 1758), P. sanguinolentus (Herbst, 1783), Thalamita crenata Rüppell, 1830, Portunus gracilimanus (Stimpson, 1858), Podophthalmus vigil (Fabricius, 1798), Myra fugax (Fabricius, 1798), Leucosia pubescens Miers, 1877 [currently also known as Seulocia pubescens (Miers, 1877)], L. anatum (Herbst, 1783), Etisus laevimanus Randall, 1840, Doclea ovis (Fabricius, 1787), D. hybridoidea Bleeker, 1856 [currently also known as Doclea muricata (Herbst, 1788)], Cryptopodia angulata H. Milne Edwards & Lucas, 1841, Charybdis smithii MacLeay, 1838, C. riversandersoni Alcock, 1899, C. lucifera (Fabricius, 1798), C. hoplites (Wood-Mason, 1877), C. feriata (Linnaeus, 1758), Calappa lophos (Herbst, 1782), C. granulata (Linnaeus, 1758), and C. gallus (Herbst, 1803).

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    Commercial crab landings at Mangalore fisheries harbour in 2009-2012: Charybdis feriata (Linnaeus, 1758), Portunus pelagicus (Linnaeus, 1758) and P. sanguinolentus (Herbst, 1783).

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    Spatial distribution of Charybdis hoplites (Wood-Mason, 1877) and Charybdis smithii MacLeay, 1838 in the prospected area along the southwestern coast of India.

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    GIS aided biomass estimation of Charybdis hoplites (Wood-Mason, 1877).

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