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

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Title Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore
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Creator Durgekar,N Raveendra
Anoop,A K
Zacharia,P U
Krishnakumar,P K
 
Subject Bottom trawling
physico-chemical parameters
nutrients
Mangalore
 
Description Not Available
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.
Not Available
 
Date 2021-09-08T08:03:25Z
2021-09-08T08:03:25Z
2006
 
Type Article
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/61682
 
Language English
 
Relation Not Available
 
Publisher MBAI