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Net avoidance behaviour among larval, juvenile and adult euphausiids

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Relation http://eprints.cmfri.org.in/1083/
 
Title Net avoidance behaviour among larval, juvenile and adult euphausiids
 
Creator Mathew, K J
 
Subject Phytoplanktons
 
Description During the present investigations all attempt was made to assess the degree of net avoidance
capability of euphausiids at the larval, juvenile and adult levels. The study was faciliated by a series
of zooplankton samples collected during both day and night from 5 m above bottom to the surface.
In spite of sampling from' almost' bottom, striking difference in the avilability was observed especially
for the adults of several species being, in most of the cases, more in the night samples. The results
obtained have led to derive some conclusions on the behaviour of euphausiids.
The present studies indicated that as far as the larvae were concerned, the degree of variation in
abundance was least between day and night and this speaks for their inability to avoid an approaching
net in the da> light. However, marked increase in number was osbserved with the juveniles in the
night samples. A night time increase by 57 times was observed with the juveniles of Euphausia
diomedeae, a surface shoaling species, whereas Stylocheiron affine, a mesopelagic species showed an
increase by 0.21 times only in the night samples. The adults also showed marked difference of
occurrence between day and night. An increase in number by 65.7 times was noticed
in the night abundance of Euphausia sibogae, again a surface swarming species, over the day
time occurrence. However, in the case of S. affine the night time increase was of the magnitude of
2.3 times only.
 
Publisher MBAI
 
Date 1988
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/1083/1/Math_93-98.pdf
Mathew, K J (1988) Net avoidance behaviour among larval, juvenile and adult euphausiids. Journal of the Marine Biological Association of India, 30 (1&2). pp. 93-98.