Distribution of organochlorine pesticides and heavy metal residues in fish and shellfish from Calicut region, Kerala, India
Introduction
OCPs are ubiquitous and persistent pollutants due to bioaccumulation in the food chain either as such or as their metabolites, thus causing concern on the animals at the top of the food chain. Though many persistent OCPs are restricted or banned in developed countries, they are still produced and used to a large extent in developing counties. Agriculture and health sector are the major consumers of pesticides in India. About 145 pesticides were registered in India in the mid nineties and the production was approximately 85 000 metric tons (Gupta, 2004). Aldrin, BHC, chlordane, endrin heptachlor and dieldrine are included in the list as banned pesticides and DDT and lindane are included in the list of pesticides restricted for use in India by the Central insecticides Board and Registration committee.
Even though India occupies fourth position in terms of fish production, the per capita consumption of fish in India is only 4.8 kg year−1 (http://www.st.nmfs.gov/st1/fus/us04/08perita2004.pdf). India exports shrimp and fish to the world market and majority of the population along the coastal regions consume fish.
Presence of OCPs in water and sediments has been extensively studied (Haynes and Johnson, 2000, Haynes et al., 2000, Guruge and Tanabe, 2001, Fillmann et al., 2002, Doong et al., 2002). Monitoring of fish and shellfish serves as an important indicator of the water ecosystem (Fairey et al., 1997) where there is a vertical transport of OCP leading to accumulation in the benthic organisms (de Brito et al., 2002). Presence of some of the forbidden pesticides in shrimp at critical concentrations and the drastic metabolic changes related to its bioaccumulation in the tissue have been reported by Harrison et al. (1996). Reports are available in plenty indicating the presence of OCP in a variety of commercial fish species in many countries (Itawa et al., 1993, Kannan et al., 1995, Grobler et al., 1996, Pastor et al., 1996, Fairey et al., 1997, Anon, 1998, Spiric and Saisic, 1998, Chan et al., 1999, Monirith et al., 1999, Cleeman et al., 2000, Zhulidov et al., 2000, Jabbar et al., 2001). Compared to this only few reports are available on the presence of pesticide residues in fish from Indian waters (Radhakrishnan et al., 1986, Radhakrishnan and Antony, 1989, Radhakrishnan, 1994a, Das et al., 2002, Karuppiah et al., 2005).
Heavy metals from natural and anthropogenic sources continuously enter the aquatic ecosystem where they pose serious threat because of their toxicity, long persistence, bioaccumulation and biomagnification in the food chain (Papagiannis et al., 2004). Increased industrialization and agricultural activities contribute to their increased levels in the natural waters (Tarras-Wahlberg et al., 2001). Fish being at the higher level of the food chain accumulate large quantities of these xenobiotics and the accumulation depends up on the intake and the elimination from the body (Karadede et al., 2004). However, the accumulation of heavy metals in fish and other aquatic lives is of great importance to man as fish is consumed by a large section of the population. Heavy metal accumulation in different species depends on the feeding habits (Amundsen et al., 1997, Romeoa et al., 1999), size and length of the fish (Al-Yousuf et al., 2000) and more particularly their habitat (Canli and Atli, 2003). Among the different aquatic lives clams and mussels accumulate large quantities of heavy metals due to their habitat and feeding habits.
Reports on heavy metal contamination in fish (Chan, 1995, Edwards et al., 2000, Kucuksezgin et al., 2002, Watanabe and Tanabe, 2003) oysters and clams (Lakshmanan, 1988, Radhakrishnan, 1994b, Trocine and Trefry, 1996, Senthilnathan and Balasubramanian, 1998), seals (Watanabe et al., 2002), whale (Law et al., 1997, Mendez et al., 2002) and fish products (Voegborlo et al., 1999) are available in plenty indicating a wide variation in the level of these toxicants in the organisms which could be attributed to many factors. Therefore it is very important that a carefully planned documentation taking in to account the possible variables is essential for generating a reliable database on the levels of these toxicants in aquatic organisms. For elucidating the present status of chemical contaminants viz., OCPs and HM in fish and shellfish of commercial importance, samples were collected from different habitats from the Calicut region, Kerala, India.
Section snippets
Chemicals
Petroleum spirit (60–80), diethyl ether, acetonitrile and sodium sulphate were purchased from Merck, Germany. Florisil (60/100 mesh) was purchased from Sigma, USA. The pesticide standards and heavy metal standards were purchased from Suppelco, USA (Cat No. 47557-U) and Merck, Germany, respectively.
Sampling
Fish samples were collected from Calicut fish landing center (Puthiyappa harbour – Site 1), rivers (Ferok – Site 2, Korappuzha – Site 3 and Purakkattiri – Site 4) and brackish water area (Korappuzha –
Organochlorine pesticides
The average weight, length and other relevant information on the samples are given in Table 1. The concentrations of OCPs were measured in the fish samples from different habitat viz., marine, brackish water and freshwater. OCPs were detected in all the samples but their concentrations were much below the MRL recommended for human consumption. The highest concentrations of OCPs detected in the edible portion of fish were 10.47, 70.57 and 28.35 ng g−1 in marine, brackish water and freshwater,
Acknowledgements
The authors are thankful to the Director, Central Institute of Fisheries Technology for giving permission to publish this paper. The technical help rendered by the technical staff of the Biochemistry and Nutrition Division is gratefully acknowledged.
References (61)
- et al.
Characteristic levels of some pesticides and heavy metals in imported fish
Food Chem.
(1996) - et al.
Trace metals in liver, skin and muscle of Lethrinus lentjan fish species in relation to body length and sex
Sci. Total Environ.
(2000) - et al.
Metal contamination in freshwater fish from the border region between Norway and Russia
Sci. Total Environ.
(1997) - et al.
The relationships between heavy metal (Cd, Cr, Cu, Fe, Pb, Zn) levels and the size of six Mediterranean fish species
Environ. Pollut.
(2003) Concentrations of copper, zinc, cadmium, and lead in Rabbitfish (Signus oramin) collected in Victoria Harbour, Hongkong
Mar. Pollut. Bull.
(1995)- et al.
Organochlorine pesticide residues in catfish, Tachysurus thalassinus (Ruppell, 1835), from the south patches of the Bay of Bengal
Environ. Pollut.
(2002) - et al.
Composition and distribution of organochlorines pesticide residues in surface sediments from the Wu-Shi river estuary, Taiwan
Mar. Pollut. Bull.
(2002) - et al.
Organochlorines and other environmental contaminants in muscle tissues of sport fish collected from San Francisco Bay
Mar. Pollut. Bull.
(1997) - et al.
Persistent organochlorines residues in sediments from the Black Sea
Mar. Pollut. Bull.
(2002) - et al.
PCBs, chlorinated hydrocarbon pesticides and chlorophenols in the Isipingo Estuary, Natal, Republic of South Africa
Mar. Pollut. Bull.
(1996)
Pesticide exposure – Indian scene
Toxicology
Contamination by persistent organochlorines and butyltin compounds in the West Coast of SriLanka
Mar. Pollut. Bull.
Organochlorines in the coastal marine environment of Vanuatu and Tonga
Mar. Pollut. Bull.
Organochlorine, heavy metal and polyaromatic hydrocarbon pollutant concentrations in the Great Barrier Reef (Australia) environment: a review
Mar. Pollut. Bull.
Pesticide and herbicide residues in sediments and sea grasses from the Great Barrier Reef world heritage area and queensland coast
Mar. Pollut. Bull.
Heavy metals in mullet, Liza abu, and catfish, Silurus triostegus, from the Atatürk Dam Lake (Euphrates), Turkey
Environ. Int.
Organochlorine residues in odontocete species from the southeast coast of India
Chemosphere
Toxic contaminants and their biological effects in coastal waters of Xiamen, China. 1. Organic pollutants in mussel and fish tissues
Mar. Pollut. Bull.
Distribution of DDT residues in fish from the Songkhla Lake, Thailand
Environ. Pollut.
Metals and organochlorines in tissues of a Blainville’s Beaked whale (Mesoplodon densirostris) and a killer whale (Orcinus orca) stranded in the United Kingdom
Mar. Pollut. Bull.
Trace metals in tissues of gray whale (Eschrichtius robustus) carcasses from the Northern Pacific Mexico Coast
Mar. Pollut. Bull.
Persistent organochlorine residues in marine and freshwater fish in Cambodia
Mar. Pollut. Bull.
Organochlorine pesticide residues in sediments and biota from the coastal area of Dar es Salaam city, Tanzania
Mar. Pollut. Bull.
Copper and zinc in four freshwater fish species from Lake Pamvotis (Greece)
Environ. Int.
Bioaccumulation of organochlorinated contaminants in three estuarine fish species (Mullus barbatus, Mugil cephalus and Dicentrarcus labrax)
Mar. Pollut. Bull.
Environmental impacts and metal exposure of aquatic ecosystems in rivers contaminated by small scale gold mining: the Puyango River basin, Southern Ecuador
Sci. Total Environ.
Metal concentrations in sediment, water and clams from Indian river Lagoon, Florida
Mar. Pollut. Bull.
Determination of heavy metals in fish samples of middle Black sea (Turkey) by graphite furnace atomic absorption spectrometry
Food chem.
Mercury, cadmium and lead content of canned tuna fish
Food Chem.
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