Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore
KRISHI: Publication and Data Inventory Repository
View Archive InfoField | Value | |
Title |
Immediate effects of experimental otter trawling on the physico-chemical parameters of seawater off Mangalore
Not Available |
|
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
|
|