The distribution of transferrin alleles in haddock stocks

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Abstract
This paper concerns the use of transferrin alleles for discriminating between natural populations of haddock. Electrophoretic analyses of blood plasma in haddock ( Melanogrammus aeglefinus L.) have revealed qualitative variations in transferrin molecules. The variations are attributed to a series of 21 co-dominant alleles at the Tf gene locus in haddock and were used in a study of haddock in the vicinity of the British Isles between 1976 and 1983. Haddock were sampled extensively over the northern North Sea and at Faroe, the Hebrides, and Rockall. The material contained fifteen consecutive year broods which were spawned from 1967 to 1981. Sexes were determined. Blood specimens were tested for isoallelic forms of transferrin Statistical analyses of the geographical distribution of transferrin alleles indicated two races of haddock in the North Sea, and at least three, and possibly four, distinct races of haddock in the surveyed areas. A genetically continuous race of haddock in Scottish waters extends around the Hebrides, the Northern Islands, and the east coast. A different race of haddock occurs in the eastern longitudes of the North Sea. The latter race is almost indistinguishable from the haddock at Faroe, but the Faroe haddock population contains a higher incidence of rare alleles. Rockall haddock is another distinctive race.

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