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Environmental influences on the trawl catches in a bay-estuarine system of Goa, west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Environmental influences on the trawl catches in a bay-estuarine system of Goa, west coast of India
 
Creator Ansari, Z.A.
Sreepada, R.A.
Dalal, S.G.
Ingole, B.S.
Chatterji, A.
 
Subject environmental impact
trawlers
demersal fisheries
multivariate analysis
fishery management
estuarine fisheries
coastal fisheries
catch statistics
 
Description The degree of relationship between trawl catch and environmental variables was assessed in a bay-estuarine system of Goa, west coast of India using multivariate techniques. The demersal fish assemblage was dominated by the families, Leiognathidae, Sciaenidae, Clupeidae, Cynoglossidae and Stromateidae and were considered to be typical for the Indo-Pacific. Patterns in community-structure were analyzed by principal component analysis (PCA) which identified five major species-groups that explained 66% of the variation in absolute fish biomass. PCA was also performed using 13 environmental variables to reduce data set variability to four components which accounted for 75% of environmental variation. The model that best explained variation in absolute biomass based on maximum R u2 (adjusted) and minimum Mallows' Cdp statistic was 71% and included six variables such as dissolved oxygen, macrobenthic density, sediment pH, photosynthetic pigment (Chl a), particulate organic carbon (POC) and seston. The regression coefficients were significant (P is less than 0.05) and small values of Cdp indicated the preciseness of the developed model. Path analysis was used to construct a hypothetical causal path diagram to depict the interaction between fish biomass and environmental variables. The study demonstrated the most important variables with regard to environmental-biotic interactions, although the measured variables did not account for all the variation in trawl catches. Further studies elucidating ecologically meaningful relationships should be helpful in bay-estuarine fisheries management.
 
Date 2008-07-18T05:07:19Z
2008-07-18T05:07:19Z
2003
 
Type Journal Article
 
Identifier Estuarine, Coastal and Shelf Science, Vol.56; 503-515p.
http://drs.nio.org/drs/handle/2264/1208
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Elsevier