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> Name of MY edible fish & Fish eating concern, Fish name in Malaysia & mercury in fish Q&A

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6216
post Jan 19 2018, 11:59 PM

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Good info on fish here. Thanks.



QUOTE(gark @ Jan 17 2018, 11:39 AM)
Anyway.. not only Mercury.. but lead, arsenic, cadmium.. is also a concern..
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QUOTE(gark @ Jan 17 2018, 01:38 PM)
No need professor level.. just read the contents like a book.

Here i summarize for you.

1. Mercury content is co-related to length and weight = ie. eat smaller fish
2. Fish near large cities have higher mercury concentration = ie. east fish from east coast or northern malaysia
3. Low mercury = Spanish mackerel, perch and sardines
4. Medium mercury = Indo-Pacific mackerel, promfet, longtail tuna, snapper, bream (redfish)
5. Highest mercury = tongkol, selar (Both sample from selangor fish market)
6. Lowest mercury level is fish sample from langkawi
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Are you referring to total As & Hg? Or they're already speciated? Fishery Dept does speciation? If they do, the LC has a tendency to transform while separating due to metal in the pathway as not everything is Peek. Secondly, is the ICP-MS sensitive enough?
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post Jan 20 2018, 12:15 AM

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QUOTE(xxhenry89xx @ Jan 20 2018, 12:08 AM)
Whoa, hold your horses.  biggrin.gif

English, please?  tongue.gif too many scientific words.
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They use an ICP-MS to determine heavy metals, but that can only give you total content and not the types of say, organic and inorganic. That has to go through separation by either a liquid or ion chromatography. I'm not too sure if MY uses speciation techniques or not but if they do, it's probably a liquid chromatography instrument which has metal parts that might transform the methylmercury back to normal, so you won't be able to detect it anyway.
6216
post Jan 20 2018, 01:10 AM

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QUOTE(xxhenry89xx @ Jan 20 2018, 12:48 AM)
Let me get this straight.
What you mean is if the list by Malaysia are research result that use a liquid chromatography instrument, the methylmercury contents in a fish are not accurate?
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High probability. But in metal analysis, you use ICP or ICP-MS. Only when you need to speciate for organic and inorganic, then you need a chromatograph in front of the ICP-MS when you want to look at the species for eg, Hg2+, MeHg, EtHg and PhHg. Otherwise for T-Hg, an ICP will suffice.
6216
post Jan 23 2018, 02:14 PM

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QUOTE(upcars @ Jan 23 2018, 12:19 PM)
inside a fish, u cant . in the waters, u can.
i dont know what's the damn scare with mercurial poisoning. u'd need quite a bit to poison yourselves with it. consuming shit loads of fish wont be enough to poison u unless those fish are caught in waters that are laden with high conductivity. if its too much mercury, the fish will die first before u even get to it. if it's swimming, its fine.

more than 65% of your fish is now farmed. i have inspected many hatcheries and grow-out premises and i find that they are all good and doing well. regardless taiwan, msia, thailand, norway, indoensia, all their hatcheries and grow out are in good conditiion.

The ones using RAS & CRAS farms are the best. No contaminants at all. As a certified personnel in the aquafarming industry, u guys should just relax and eat up. If its caught in the natural, then u can raise some flags. If its farmed, which most likely it is, then eat with ease.
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Errr.....

QUOTE(upcars @ Jan 23 2018, 01:45 PM)
i'm not in traditional farming. nobody is in traditional farming. yield is too low using traditional farming. its 2018.

and sardines is in their list of safe to eat seafood ? lol. u should consume more.

genetic mod like what ? durian ? i dont think any of our durians are GMO. only cross breeding, which isnt genetic mods. neither is your grouper species cross breeding a genetic mod. our palm oil also isnt genetically modded. only cross breeding. AFAIK GMO not available for any marine species otherwise u'd see some giant sized snappers and giant sized mackerel and some giant sized oysters. u have giant sized patin which is called Mekong but that's in its original form still.

antibiotics do not work in saltwater where salinity is high. neither does FGH.
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Palm oil no GMO? You sure? I wonder what we're sequencing in ACGT, Sime Darby, MARDI, etc? Antibiotics given in feed can still accumulate in fish. They also accumulate in the sediments in cages.
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post Jan 23 2018, 02:59 PM

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QUOTE(upcars @ Jan 23 2018, 02:34 PM)
few months ago i was in a discussion with PORIM about the effects of fertilizer and pesticide impact on conventional aquaculturing. i also did ask them naturally about GMO on Palm Oil trees and other variable enhancements. I was told there was no genetic modifications going on and that they would know cause they are the board.

antibiotics inserted into feed is mainly for freshwater farms, specifically prawn farms. no one in the aquamarin industry would pile on costs to give antibiotics as it is just added cost with very little value or no value. cages is soon to be a thing of the past, and i dont know many who give pellet feed when grow-out is done in cages. most of those i know have a diff diet for those grow-outs in cages out in the sea.
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Nahhh..MPOB isn't the sharpest knife in the kitchen. They are genetically modded to increase yield, lower cost, resistance to pest, etc. The problem with these plantations, they don't talk to each other and they don't tell MPOB everything. Too many trade confidentiality. MPOB, 3-MCPD pun tak pandai nak buat efficiently. Dioxin pun belum tahap expert lagi. When we validate their NGS, at least 40% short read errors, like we have to redo, and not cheap wei.

Much uneaten feed, waste, etc laden with peroxide, antibiotics, copper etc end up there la, bro. While you may not actively supply, they still end up at the same place. We find a/b in farmed salmon too. Fish are full of zoonotic pathogens. Also some antibiotic is use as growth promoters. You may not use it, others may. The fertiliser and pesticide you mentioned, also gets back into the water system and might end up at the fish farm.

Back to Hg....a total Hg analysis isn't going to cut it now that we know MeHg is toxic....to us when we ingest some over a period of time.
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post Jan 23 2018, 03:22 PM

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QUOTE(upcars @ Jan 23 2018, 03:19 PM)
no choice, in this industry what they say we have to follow. if they say dont have, then dont have. we aren't gonna be the ones arguing with the board, otherwise we jeopardize our business.

your zoo plankton only applicable to very few types of marine species. siakap , jenahak and those ikan merah tahan lasak types. kerapu, tongkol and others cannot. only use pure cultivated rotifer and artemia. even copipot also we leave out. i know someone who owns a mahi-mahi farm here in malaysia. doing pretty well, and he is only purely on 0.03 micron artemia.

you are partially right but still uninformed. the trend is already moving away from conventional farming of grow-out in sangkar. those are the ones baru nak masuk join in the crowd or yang takde modal. every medium sized player has already moved to partial RAS. low discharge, sludge kek, low maintanence, high efficiency. works well especially for those located at perairan selat melaka. those who export gotta comply with LKIM and their respective jabatan perikanan (moa). since i'm qualified, i was put to certify a few plants and premises and all i see are RAS and CRAS systems. no foreign objects, no foreign modules, no foreign particles, no foreign matter.

the only reason why there was a discussion between us and MPOB is the worries of the discharge flow, industrial waste and the pesticide/ferti that seeps into the soil and slushed away by rainfall into the sea. palm oil plantation and aquafarming dont really work hand in hand. we're more like i hate u, u hate me kind of thing.

but do rest assure, majority are moving or have moved to RAS. its the only way to obtain a higher yield and control diseases and water quality. the protein skimmer, degasser, inducer, ozone and biomedia + UV is enough. conductivity is monitored constantly so i can assure u, there are little or next to no elements of metal. its pretty much a stripped up clean water pretty close to De-ionised water system (cept we retain salinity)
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We'll see....I just hope we don't impose a voluntary ban like we did a few years ago. Better that than getting banned by EU.

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