the "certificate" i mentioned above is not issued in HK, since there no ornamental fish catching business in HK.
what i meant is the "cert"in PI.
this is an essay written by Mary Middlebrook:
http://www.reefsource.com/MSI%20Articles/cyanide.htm
the article makes a point that the "cert" issued by the MAC(Marine Aquarium Coucil) is just a series of paperworks, no actual CDT(cyanide detection test)was taken.
The official said that they will carry out CDT later, but i have no further infomation.
i read other internet articles saying that the PMP(Filipino for the Federation of Aquarium Fish Gatherers of the Philippines, Inc.),
which is an organisation aiming to train the fishermen to use evirnoment friendly methods to collect fish, such as using fence netting.
their certificate seems to be more reliable than those issued by the
MAC because PMP was originally assisted by
Ocean Voice International and
International Marinelife Alliance .
they have more than one thousand members now and some of them became "instructors" in indonesia, teaching the collectors to use environment freindly methods.
i don't know what is the situation now in PI.
as i am just a amature hobbist who also concerns the destructive influence in coral reefs cause by the aquarium hobby.
a few months ago, someone visited the fishermen in PI and he told me that the fishermen said that half of the fish collectors have abandon using cyanide.
(there are about 2500 fish collectors in PI)
that's all i know from reading the internet and veiwing some documentary videos.
regarding the cyanide food fish trading in HK,
i haven't heard of of any news about cyanide food fish in HK, as least for the past few years.
there were ocassionally, some news about ciguatoxin found in the napoleaon wrasse and groupers.
and ciguatoxin is a result of natural toxin accumulated in the fish body as a result of food chain.
so ppl are advised not to eat large size coral food fish in order to avoid take in the toxin.
destructive fishing methods are prohibited in HK, and there is no "certificated" issued by any bodies.
i am not in the fishery industry, so i am not sure whether laws are enforced effectively, since most of the mass fishing is carried out of HK territories.
however, fishermen from mainland China seem to use dynamite more often. dynamites are often found when some fish boat from mainland China were searhed for inspection.
that's all know about the cyanide fishing.
i hope someone will correct me if i am wrong.