|Adult at the Dorée Tropical Aquarium|
Cyclopterus lumpus, the lumpsucker or lumpfish, is a species of marine fish in the family Cyclopteridae (lumpsuckers). It is the only member of the genus Cyclopterus. It is found in the North Atlantic and adjacent parts of the Arctic Ocean, ranging as far south as Chesapeake Bay (rare south of New Jersey) on the North American coast and Spain on the European coast.
Males typically reach 30–40 cm (12–16 in) in length and the larger females rarely surpass 50 cm (20 in) in length and 5 kg (11 lb) in weight. The maximum is 61 cm (24 in) in length and 9.5 kg (21 lb) in weight. In the brackish water of the Baltic Sea it usually does not surpass 20 cm (8 in). The body is ball-like. It has a knobbly, ridged back and three large bony tubercles on each flank. Its pelvic fins form suction discs which it uses to attach strongly to rocks or other surfaces. The head and the pectoral fins of males are larger than those of females. It has a jelly-like layer of fat under the skin which makes it appear to quiver when held in the hand. Its colour is highly variable; bluish, greyish, olive, yellowish or brownish. Mature males, which turn orange-reddish during the breeding season, are brighter than females.
After hatching, lumpfish will spend their first few months in tidal pools, or in association with floating seaweed clumps. As they grow they migrate out into open water far from land where they live in the pelagic zone feeding upon gelatinous zooplankton, fish eggs and small crustaceans. When they reach maturity they will migrate to coastal areas in spring to breed. The female can carry 100,000–350,000 eggs, which are laid in a "nest" that is made in relatively shallow water by the male. The male also guards and cares for the eggs by fanning them with his fins during the month-long incubation period.
Several aspects of their biology (i.e. lack of a swimbladder, its pelvic suction disc) led some to believe that they were a bottom dwelling species. Lumpfish are frequently caught in pelagic fishing nets, however, capture in bottom trawls is also common. An investigation using electronic data-storage tags attached to the fish have confirmed that, at least during its breeding migration, this fish will spend time associated with the sea bed, and also some time in the pelagic zone. As the fish came close to breeding, they began to spend a greater amount of time in the pelagic zone. With the lack of a swim bladder, the fish were able to make rapid movements through the water column, moving between surface waters and depths of over 300 m (980 ft) within one day. Data from research surveys and data-storage tags show that adult lumpfish alter their behaviour between night and day with the fish spending more time in the pelagic zone at night and found associated with the seabed during the day, the reasons for this are unclear. This fish is now considered to be a semi-pelagic/semi-demersal fish.
Fisheries in Iceland and Greenland are the main contributors to the worldwide catch of lumpfish. Historically, Norway and Canada also contributed significant amounts but due to a decrease in the price of salted roe, and a severe population decline in Canada, the contribution from these countries has decreased. Denmark and Sweden have also contributed but the amount has been low in comparison with the other countries. Female fish are the main target for the fishery which utilizes the roe to make lumpfish caviar. Lumpfish are targeted close to the shore, where they come to spawn, using small fishing boats (generally less than 15 m or 49 ft) with large mesh gillnets. Due to the smaller size of the male, very few are caught in the large meshes. Traditionally, the roe would be removed at sea and the bodies disposed of. In Iceland, it is now mandatory for the bodies to be landed; these are now frozen and exported, mainly to China.
In Iceland, there is also the tradition of catching the male fish, mainly for the local market. This is done using gillnets with a smaller mesh size than that used for the females. The males are targeted in January–February, which is earlier than the females which are targeted from March until August.
The roe of the fish, a good source of omega-3 fatty acids, is used to produce relatively inexpensive imitation "caviar", with the eggs dyed either red or black, pasteurised then packed with a mould-inhibitor such as sodium benzoate (E211). In Scandinavia the flesh of the fish is eaten.
They are used as "cleaner fish" to reduce the parasite burden on salmon farms in Scotland and Norway
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