Black Scorpionfish are solitary and sedentary fish that feed on small fishes like gobies and blennies. Their spines have a venomous sac so it is good that they are not aggressive fish. They don't migrate from their home base that ranges from the Atlantic to the Mediterranean and Black Seas and can blend in with their surroundings with their tassels, warts and coloured specks.
and finally, the Russian sturgeon (sometimes called the Danube sturgeon). It can grow up to over 2.5 metres (8 feet) and weigh 110kg (240lbs) and live to 40 years or more. But it is an endangered species and river damming has decimated the population by as much as 90% in just three generations. The caviar is much sought after and though fishing is now banned it isn't always enforced.
These colourful stamps were issued in 1964 (and represent only 3 of the 9 issued. I didn't want to trail on too long and bore you all, but you can see the entire set here).
You can also see more sea creatures at Sunday Stamps