Journal of Food, Agriculture and Environment

Vol 12, Issue 3&4,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Seasonal elemental variations of Fe, Mn, Cu and Zn and conservational management of Rastrelliger kanagurta fish from Karachi fish harbour, Pakistan


Quratulan Ahmed 1, Farzana Yousuf 2, Maliha Sarfraz 3, Nor Kartini Abu Bakar 4, Mansour A. Balkhour 5, Muhammad Aqeel Ashraf 6*  

Recieved Date: 2014-07-06, Accepted Date: 2014-09-24


Fish samples of Rastrelliger kanagurta of various lengths (cm) and weight (g) were collected from the coast of Karachi fish Harbour during August, 2006 to December, 2011. Samples were analysed as seasonal variation for Fe, Mn, Cu and Zn by using Atomic Absorption Spectroscopy. The highest (24.0±1.75) and the lowest mean (23.5±1.65) lengths of fish were measured in 2009-2010 and 2010-2011. The maximum (132±22.76) and minimum (126±18.65) weights were also measured in 2009-2010 and 2010-2011. The highest (498.21±161.37 µg/g) and lowest (16.74±14.07 µg/g) mean concentrations of Fe were recorded in liver and gonads of fish during 2007-2008. Maximum (18.23±9.46 µg/g) and minimum (0.51±0.45 µg/g) concentrations of Mn were determined in liver and gonads during 2006-2011.  Fishing operations can cause ecological impacts of different types: by catches, damage of the habitat, mortalities caused by lost or discarded gear, pollution, generation of marine debris, etc. Periodic reassessment of the R. kanagurta potential is also required with adequate inputs from exploratory surveys as well as commercial landings and this may prevent any unsustainable trends in the development of the tuna fishing industry in the Arabian Sea.


Heavy metals, Rastrelliger kanagurta, fish harbour, Karachi, Pakistan

Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Environment
Pages: 405-414

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