Objective:To carry out a detailed three-year observation study on isopod parasites infestation in fish.Methods:Fish samples were collected from different localities in various landing centers along the Tamil Nadu coas...Objective:To carry out a detailed three-year observation study on isopod parasites infestation in fish.Methods:Fish samples were collected from different localities in various landing centers along the Tamil Nadu coastal area.The prevalence and mean intensity were calculated.The proximate composition of infestation and uninfestation were studied in different marine fishes.A comparative analysis of bacteria and fungi in the infected and uninfected regions of fishes were analysed.Results:Tweenty six species including 12 genera of isopods(Cymothoidae)distributed in 39 species of marine fishes along the Tamil Nadu coast.The isopod parasites were attached in three different microhabitats in host fishes viz.,buccal,branchial and body surfaces.They exhibited host and site specific occurrence.Maximum prevalence 17.11%was recorded in March 2010 and minimum 0.27%in Febuary 2010.The intensity ranged from 1 to 1.7 parasites per fish during the different months from Decmber 2008 to November 2011.There was a decrease in the protein,carbohydrate and lipid content in the infested fishes compared to uninfected fishes.A comparative analysis of bacteria and fungi in the infected and uninfected region of fishes were analysed.It revealed that infected portions had dense bacterial load as observed in the lesions of infected fishes than uninfected fishes.Conclusion:Factors which are able to induce parasitic manifestation are stock quality,stocking density,environmental conditions,biological and physiological characteristics of parasite,zoo technical measures,food quantity,feeding strategies,etc.展开更多
基金Supported by Department of Science and Technology(Grant No:SR/FF/LS-088/2007)Ministry of Environment&Forest,Government of India(Grant No:22-18/2008-CS-I).
文摘Objective:To carry out a detailed three-year observation study on isopod parasites infestation in fish.Methods:Fish samples were collected from different localities in various landing centers along the Tamil Nadu coastal area.The prevalence and mean intensity were calculated.The proximate composition of infestation and uninfestation were studied in different marine fishes.A comparative analysis of bacteria and fungi in the infected and uninfected regions of fishes were analysed.Results:Tweenty six species including 12 genera of isopods(Cymothoidae)distributed in 39 species of marine fishes along the Tamil Nadu coast.The isopod parasites were attached in three different microhabitats in host fishes viz.,buccal,branchial and body surfaces.They exhibited host and site specific occurrence.Maximum prevalence 17.11%was recorded in March 2010 and minimum 0.27%in Febuary 2010.The intensity ranged from 1 to 1.7 parasites per fish during the different months from Decmber 2008 to November 2011.There was a decrease in the protein,carbohydrate and lipid content in the infested fishes compared to uninfected fishes.A comparative analysis of bacteria and fungi in the infected and uninfected region of fishes were analysed.It revealed that infected portions had dense bacterial load as observed in the lesions of infected fishes than uninfected fishes.Conclusion:Factors which are able to induce parasitic manifestation are stock quality,stocking density,environmental conditions,biological and physiological characteristics of parasite,zoo technical measures,food quantity,feeding strategies,etc.
