Study on the Physico-Chemical Parameters Present in Shrimp and Shrimp Culture Water for the Improvement of Sea-food Quality of Khulna Region, Bangladesh

Abstract

This research provides guidance on how to develop shrimp quality in aquaculture. Aquaculture development is growing rapidly worldwide due to increasing demands of its products and limited production from Inland and marine capture fisheries. The research studied water of different sources which are used in shrimp culture. The results provided significant information and the values were compared with the current standard values or acceptable physico-chemical factors that affect the quality of shrimp culture water as well the quality of shrimp. The current state of knowledge on the acceptable limits of hazardous chemicals in water used for fisheries and aquaculture and the acceptable concentrations accumulated in the tissue of aquaculture products are also furnished. Shrimp and shrimp culture water were collected and tested from different locations or shrimp farms (Ghcrs). hatcheries and nurseries of Bagerhat, Satkhira and Khulna district. The farms were chosen and designated as 1-9 from Satkhira. 10-1 8 from Khulna and 19-27 from Bagerhat. Different parameters such as, pH, DO, BOD, Fe, salinity, hardness, turbidity and heavy metals were performed. DO, BOD, pH and salinity were measured on the spot after collecting the shrimp culture water from shrimp farms (Ghers), hatcheries and nurseries. Turbidity, hardness. NO3 and Fe were measured in the laboratory with spectrophotometer (DR-4000) in Fisheries office, Khulna. Heavy metals were measured atomic absorption spectrophotomer in atomic energy center. Dhaka. Bangladesh. The values of pH, BOD, salinity and hardness at different location of' Bagerhat were found within standard limits in furms nos. 19 to 27 but DO was found to be high. The values of BOD and iron at different location of Khulna were found within standard limits in farms 10 to 18 but pH, turbidity, salinity, hardness, and DO were found to be high. The values of hardness, BOD and iron at different location of Satkhira district were found within standard limits in farms nos. I to 9 but pH, turbidity, salinity, and DO were found to be high. The values of nitrate in all farms at Satkhira, Khulna and Bagerhat district were low. The heavy metal such as Pb, Cr, Cd and Hg in shrimp culture water were found within standard limit in Satkhira district in farms nos. 1, 4 and 7 and heavy metal in shrimp were found within standard limit in farms nos. 1 to 9. The values of heavy metal Pb in shrimp for shrimp in farms nos. 11, 12,14, 15, 1 7 and 18 of Dumuria, Koyra and Paikgachha of Khulna district were found within standard limit but in farms nos. 10, 13 and 16 were high. The value of Hg in shrimp culture water for shrimp farms of Dumuria, Koyra and Paikgachha of Khulna district were found in farms nos. 10 to 18 within standard limit. The value of Cd in shrimp culture water for shrimp farms of Dumuria. Koyra and Paikgachha of Khulna district were found in farms nos. 10, 12,14,15,17 and 18 within standard limit but in farms nos. 11, 13 and 16 were higher than standard limit. The value of Cr in shrimp culture water for shrimp farms of Dumuria, Koyra and Paikgachha of Khulna district were found in farms nos. 10, 11, 12, 14, 15, 17 and 18 within standard limit but in farms nos. 13 and 16 were higher than standard limit. The values of heavy metals Pb, Hg, Cd, and Cr in shrimp for shrimp farms of Rampal, Mongla and Bagerhat main town of Bagerhat district were found within standard limit in farms nos. 19, 20, 21, 22, 23, 24, 25, 26 and 27. The quality of physico-chemical parameters in shrimp culture water at different locations at Bagerhat was found to be standard and the presence of heavy metals in shrimps at these locations was found to be within standard limit. The physico-chemical parameters such as pH, salinity, hardness. DO, BOD, NO3- Fe and heavy metals in shrimps and shrimps culture water of other areas should be maintain as like as Bagerhat.