There's this kind of fish in the market which you'd usually find it in fillets form comes from Vietnam. I don't know what kind of fish but they call it Bassa. I used to cook it and eat it until one day an asian guy advised not to buy it as I was standing in line to check out. Said he knew what kind of fish that was and how/where they thrived them. In sewage!!! I'm alright but a relative of mine started having problems in her stomach for she did not stop consuming it like I did years ago and doctors are still putting her through more tests to know what her problem is. Could it be it??? Is it harmful eating fish which thrived in sewage?
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safe consumption of fish is entirely contingent upon safe handling of the fish prior to consumption -- this includes understanding what fish are eating.
for example, today, tilapia (whole and fillets) are cheap and readily available in supermarkets. They are farmed (often in prison work farms) and harvested and brought to market under the best aquaculture conditions. However, despite that, many of the older generation in Hawaii still refuse to even consider eating it because when they were growing up, tilapia generally thrived in the waste water pools in the cane fields and often eating human waste effluents from overflowing cesspools. The people that knew how to prepare tilapia knew that after they were caught, the tilapia had to be kept in a tub of clean water and fed a steady diet of frozen peas or other "good quality" food for at least a week -- to purge their systems of toxins -- prior to preparation for consumption. Failure to do so resulted in sickness most memorable. Just being witness to the sickness resulting from someone eating unclean tilapia was equally memorable -- hence, many of the older generation in Hawaii will always refuse to eat tilapia.
another good example is ciguitera -- a neurotoxin that does not metabolize that is produced in some algaes that enters the food chain when it is consumed by small fish that are subsequently consumed by large fish. as a result, many of the wild pelagic (and best eating) fish caught from around areas where ciguitera is known to exist are not safe for consumption. to make those species available, extensive aquaculture efforts have been made and proven largely successful for bringing those excellent fish back to the table.
So what it boils down to is this : do you know under what conditions your fish was prepared for consumption? if not, then you're safer not buying it.
for example, today, tilapia (whole and fillets) are cheap and readily available in supermarkets. They are farmed (often in prison work farms) and harvested and brought to market under the best aquaculture conditions. However, despite that, many of the older generation in Hawaii still refuse to even consider eating it because when they were growing up, tilapia generally thrived in the waste water pools in the cane fields and often eating human waste effluents from overflowing cesspools. The people that knew how to prepare tilapia knew that after they were caught, the tilapia had to be kept in a tub of clean water and fed a steady diet of frozen peas or other "good quality" food for at least a week -- to purge their systems of toxins -- prior to preparation for consumption. Failure to do so resulted in sickness most memorable. Just being witness to the sickness resulting from someone eating unclean tilapia was equally memorable -- hence, many of the older generation in Hawaii will always refuse to eat tilapia.
another good example is ciguitera -- a neurotoxin that does not metabolize that is produced in some algaes that enters the food chain when it is consumed by small fish that are subsequently consumed by large fish. as a result, many of the wild pelagic (and best eating) fish caught from around areas where ciguitera is known to exist are not safe for consumption. to make those species available, extensive aquaculture efforts have been made and proven largely successful for bringing those excellent fish back to the table.
So what it boils down to is this : do you know under what conditions your fish was prepared for consumption? if not, then you're safer not buying it.
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NONE.