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Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore

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Relation http://eprints.cmfri.org.in/2086/
 
Title Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore
 
Creator Zacharia, P U
Anoop, A K
Durgekar, N Raveendra
Krishnakumar, P K
 
Subject Seawater study
 
Description Experimental otter trawling was carried out for 11 months (May 2001 -November 2002) off Mangalore coast
to evaluate its immediate effect on physicochemical parameters of seawatej. Five stations (1-5) with increasing
depths (]Om, 20m, 30m, 40 m and 50rn) were selected for the study using a systematic BACI (Before1
After and Controlllmpact) design. Trawling impact on the changes in salinity, temperature, dissolved oxygen,
total suspended solids and nutrients (nitrite, nitrate, phosphate and silicate) were assessed. Temperature,
salinity and pH were similar before and after trawling. The results indicate that TSS at surface and bottom
waters increased immediately after trawling which was prominent at the shallow stations with significant
difference (P < 0.05) at station 2. Changes in nutrient load by trawling were occasionally observed. Trawling
had only a minor effect on transparency, dissolved oxygen and nutrients. Multivariate analysis (PCA) also
revealed minor impact on the physicochernical parameters due to trawling.
 
Publisher MBAI
 
Date 2006
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/2086/1/Zacharia_200-205.pdf
Zacharia, P U and Anoop, A K and Durgekar, N Raveendra and Krishnakumar, P K (2006) Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore. Journal of the Marine Biological Association of India, 48 (2). pp. 200-205.