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Some aspects on ecotoxicology and Ecophysiology of shrimp Penaeus semisulcatus (De haan, 1844) to copper, Cadmium and zinc (TH 117)

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Relation http://eprints.cmfri.org.in/7193/
 
Title Some aspects on ecotoxicology and
Ecophysiology of shrimp Penaeus
semisulcatus (De haan, 1844) to copper,
Cadmium and zinc (TH 117)
 
Creator Sabu, A S
 
Subject Fish Toxicology
Fish Biotechnology
Theses
 
Description The thesis highlights the effect of copper, cadmium and zinc in green tiger
prawn Penaeus semisu/catus, one of the penaeids occurring throughout the
Indian coastal waters particularly in the Gulf of Mannar and Palk Bay. Acute
toxicity bioassays were conducted for copper (Cu), cadmium (Cd) and zinc (In ).
The 96 h LCso for copper, cadmium and zinc were 6.98 ppm, 2.8 ppm and 5.00
ppm respectively. The degree of toxicity of the three metals were in the order Cd
> In > Cu. Based on the LCso values, two sublethal concentrations of copper (0.7
ppm and 1.4 ppm), cadmium (0.25 ppm and 0.5 ppm) and zinc (0.5 ppm and
1.00 ppm) were selected for bioaccumulation, physio-biochemical and
histopathological studies. In all the lethal and sublethal exposures, blackening of
the gill lamellae and exoskeleton was noticed. The accumulation of metals was
pronounced in the hepatopancreas, gills, muscle, tail and carapace. The results
of the study suggest that the shrimps could not regulate the accumulation of Cu.
Cd and In . The bioaccumulation in the selected organsltissues was found to be
dose dependent. In the physio-biochemical studies. an increase in the respiration
rate was found in shrimps exposed to lethal concentrations of copper. cadmium
and zinc. The biochemical components, carbohydrate, protein and lipid were
found to get reduced during the various phases of metal exposure. The observed
change in the proximate components is attributed to the alterations in the
enzymes involved in cellular energy generation processes. inhibition of protein
synthesis by the alteration in the DNA and RNA content and increases in the free
fatty acid content due to changes in the synthesis and mobilization of lipids.
Histopathological changes include haemocy1ic infiltration. swelling of gill
lamellae. fusion of gill lamellae. lifting of lamellar epithelium. fusion and necrosis
of secondary gill lamellae in gills and tissue debris, necrotic tubules, swelling and
abnormal lumen in hepatopancreas. Ultrastructural changes in gills include
damaged nuclear membrane. disrupted mitochondria, distorted endoplasmic
reticulum. apical cell damage, and damage to mitochondrial and nuclear
membrane. In hepatopancreas vacuole formation. breakage of cell membrane.
swelling of nuclear membrane. condensed nucleus. aggregations in nucleus.
disrupted endoplasmic reticulum and formation of electron dense bodies were
the major changes.
 
Date 2003
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7193/1/TH-117.pdf
Sabu, A S (2003) Some aspects on ecotoxicology and Ecophysiology of shrimp Penaeus semisulcatus (De haan, 1844) to copper, Cadmium and zinc (TH 117). ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Central Institute of Fisheires Education, Versova, Mumbai.