ABSTRACT Sechura Bay receives domestic and industrial discharges from nearby cities, fishery indu... more ABSTRACT Sechura Bay receives domestic and industrial discharges from nearby cities, fishery industries and oil companies. Bottom and suspended long-line culture are the two common systems performed in scallop aquaculture, the latter has been more implemented because leads to high growth rates, less mortality and major production. The aim of this study was to investigate the Cd and Pb accumulation in gonad and muscle of A. purpuratus during January to April 2010. For the experiment among systems, a first group of 1800 medium size (50-65 mm) individuals were distributed in pearl nets at 3 (PN3) and 6 (PN6) meters depth, and in a corral at the bottom (12m) (CB12M). A second group of 600 large size (70-80 mm) individuals were distributed in a second corral (CB12L) for the experiment among sizes. The remaining 500 individuals (both range size) were considered as control. Tissue Cd levels were the highest during the 30-70 days for PN3 and PN6, while an increasing trend was observed in CB12M and CB12L. Gonad [Pb] was also higher during the same period for all cultured systems. Muscle exhibited no considerably variations in [Pb]. Among systems or depths, tissue [Cd] and [Pb] were greater in deeper culture systems. PN6 exhibited significantly higher gonad Cd (March) and Pb (March and April) levels compared to PN3, and in muscle [Pb] during February and March. CB12M led to significantly higher muscle [Cd]. There were no significant differences in Cd and Pb accumulation between range sizes.
In order to understand the effect of different culture systems on Cd and Pb accumulation, suspend... more In order to understand the effect of different culture systems on Cd and Pb accumulation, suspended long-line and bottom cultures of Argopecten purpuratus were conducted during January until April 2010 (120 days). The Cd tissue levels were the highest at the middle of the experiment (30-d till 70-d) for suspended-cultured individuals, while bottom-cultured individuals showed an increasing trend. Gonad Pb levels were also higher during the same period for all cultures, while adductor muscle exhibited no considerable variations. Cd and Pb tissue concentrations were mainly greater in deeper cultures. There were no significant differences in Cd and Pb accumulation between individual sizes. The Cd and Pb levels in edible tissue (gonad + adductor muscle) did not exceed the EU and FDA maximum levels. Based on the target hazard quotient (THQ) and the provisional tolerance weekly intake (PTWI), no risk (THQ < 1 and %PTWI < 30) was found for human consumption.
ABSTRACT Sechura Bay receives domestic and industrial discharges from nearby cities, fishery indu... more ABSTRACT Sechura Bay receives domestic and industrial discharges from nearby cities, fishery industries and oil companies. Bottom and suspended long-line culture are the two common systems performed in scallop aquaculture, the latter has been more implemented because leads to high growth rates, less mortality and major production. The aim of this study was to investigate the Cd and Pb accumulation in gonad and muscle of A. purpuratus during January to April 2010. For the experiment among systems, a first group of 1800 medium size (50-65 mm) individuals were distributed in pearl nets at 3 (PN3) and 6 (PN6) meters depth, and in a corral at the bottom (12m) (CB12M). A second group of 600 large size (70-80 mm) individuals were distributed in a second corral (CB12L) for the experiment among sizes. The remaining 500 individuals (both range size) were considered as control. Tissue Cd levels were the highest during the 30-70 days for PN3 and PN6, while an increasing trend was observed in CB12M and CB12L. Gonad [Pb] was also higher during the same period for all cultured systems. Muscle exhibited no considerably variations in [Pb]. Among systems or depths, tissue [Cd] and [Pb] were greater in deeper culture systems. PN6 exhibited significantly higher gonad Cd (March) and Pb (March and April) levels compared to PN3, and in muscle [Pb] during February and March. CB12M led to significantly higher muscle [Cd]. There were no significant differences in Cd and Pb accumulation between range sizes.
In order to understand the effect of different culture systems on Cd and Pb accumulation, suspend... more In order to understand the effect of different culture systems on Cd and Pb accumulation, suspended long-line and bottom cultures of Argopecten purpuratus were conducted during January until April 2010 (120 days). The Cd tissue levels were the highest at the middle of the experiment (30-d till 70-d) for suspended-cultured individuals, while bottom-cultured individuals showed an increasing trend. Gonad Pb levels were also higher during the same period for all cultures, while adductor muscle exhibited no considerable variations. Cd and Pb tissue concentrations were mainly greater in deeper cultures. There were no significant differences in Cd and Pb accumulation between individual sizes. The Cd and Pb levels in edible tissue (gonad + adductor muscle) did not exceed the EU and FDA maximum levels. Based on the target hazard quotient (THQ) and the provisional tolerance weekly intake (PTWI), no risk (THQ < 1 and %PTWI < 30) was found for human consumption.
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