Murex trunculus is a gastropod who lives in eutrophical environment and specially in coastal zones where bivalves are dying. It loves indeed putrefaction  and, so, it is  fished in traps (here in the Bizerte lagoon) where the bait is some putrefied meat.
That fishing  method is, to day, in Tunisia exactly the same  as  the description done by Pline  2000 years ago.
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Monastir lagoon, march 1999
10 murex are laying their eggs -they are all one year old, the eggs are brigth yellow.