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Title: Myctophid and pelagic shrimp assemblages in the oxygen minimum zone of the Andaman Sea during the winter monsoon
Authors: Karuppasamy, P.K.
Raj, C.M.Lalu
Muraleedharan, K.R.
Nair, Maheswari
Keywords: Micronekton
Vertical migration
Oxygen minimum zone
Winter monsoon
Andaman Sea
Issue Date: Aug-2011
Publisher: NISCAIR-CSIR, India
Abstract: Stratified samples were collected with a Multiple Plankton Net for assessing the myctophid and pelagic shrimps composition from the Andaman Sea during the winter monsoon. Andaman Sea has a fair representation of mesopelagic micronektonic fauna such as the myctophids and pelagic shrimps in the upper 1000 m depth. Among the myctophids, <i>Benthosema fibulatum</i> had the maximum biomass followed by <i>Diaphus lucidus </i>and <i>Benthosema pterotum</i>. Among the pelagic shrimps <i>Sergestus seminudus</i> and <i>Oplophorus types</i> were the dominant species. <i>Sergestes seminudus</i> was present at all depths [up to 1000 m] and its distribution pattern suggested the cocurence of a strong diurnal vertical migration. Temperature decreased from the mixed layer depth downwards. Salinity did not show any significant variation. Dissolved oxygen ranged between 2.8 and 4.8 mL.L<sup>-1</sup> in the upper 75 m and from 0.05 to 0.2 mL.L<sup>-1</sup> in the 150-650 m column, with a gradual increase in the bottom layers [>0.8 mL.L<sup>-1</sup>]. Majority of myctophids and shripms occurred in abundance in the oxygen minimum zone [150-650 m].
Description: 535-541
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.40(4) [August 2011]

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