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Migratory Fish Research Iflsritufe and Depcaras~serzb o j ' Z o~&~g y , U~~iversiQ of Maine ar Orcmo, Oroncr, ME 04469, USA KORNPIELD, I., B. B. SIDELL, AND P. S. GAGXON. 1982. Stock definition in Atlantic herring (Clupea haremgrxs haremgcts): genetic evidence for discrete fall and spring spawning populations. Can. J . Fish. Aquae. Sci. 39: 16310-1621.Ripe Atlantic herring (Cbupea harelagrrs harengks~s.) were sampled from seven discrete spawning grounds in the Gulf of Maine and Gulf of St. Lawrence over a period of 3 yr. Genetic polymophisrns were observed at 13 enzyme loci by starch gel electrophoresis. Five highly polymorphic loci were used to assess population structure of herring stocks by ctantingency analysis of log-likelihood differences in gene frequencies. Significant temporal variation was observed at several localities. Within both spring spawning and faII spawning populations, significant spatial heterogeneity was noted for particular years, but was not temporally stable. By contrast. overall heterogeneity between spring and fall spawning populations was highly significant indicating genetic isolation of spring spawning populations in the Gulf of St. Lawrence frcxn fa11 spawning aggregates in the Gulf of St. Lawrence and Gulf of Maine. The low levels of genetic heterogeneity and absence of both temporal stability within fall spawning samples aand spatial stability among sansples is not consistent with the existence of more than a single genetic population of fall spawning herring in the northwest Atlantic. KORNAELD, I., B. D. SIDELL, AND P. S. GAGNON. 1982. Stock definition in Atlantic herring (Clupea harengus harengus): genetic evidence for discrete fall and spring spawning populatioass. Can. J . Fish. Aquat. Sci. 39: 1618-1621.Nsus avons prblev6 des 6chantillons de harengs de I'Atlantique (CCupen hur-engm hurengus) sur le point de frayer a hept fray2res distinctes dta golfe du Maine et du golfe da~ Saint-Laurene sur une pCriode de 3 ans. L'klectrophorese sbnr gel d'amidsn a perrnis d9obser-vcr un plymorphisme gCnCtiquc 5 13 loci d'enayrne. NOUS en VOWS choisi cinq nettement poiyrnnrphes pour tvaluer la structure de population de stocks de harengs par analyse Je contingence des diffkreances de prokabilitb dans la fr@quence des gkneb. On a trouwC une variation temporelle significative B plusieurs endroits. Dans des annkes particuli?res, nous avons not6 une h6tCrogdnCit6 spatlak significative tant dans Ies populations de repr06iucteurs de printen~ps qlac dam cellcs des reproducteurs d'aueomne. Cette hCtCrogenCit6 n9est toutefois pas stable dans le temps. Par contre, 19hCtCrogCn6itC entre reprcpducteurs de prineernps ea rcproducteurs d9automne est trcs significative, signc d'une skparation g6nCtique entre les populations de reproducteurs de printernps du golfe du Saint-Lauren1 et tobates Ies agglomkrations reproduetrices du golfe du Saint-Laurent ct du goIfe du Maine. La faible hCeCrog6w6itk gCnktique 28 19absence, a la fois de stabilitk ternporelle dans les 6chantillons de reproducteurs d'autornne et d...

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Progeny from single pair crosses of Atlantic herring were examined to determine the heritability of genetic variation at seven polymorphic allozyme loci. Mendelian inheritance of codominant autosomal alleles was established for IDH-2, LDH-1, LDH-2, ME-2, PGM-1, and PGI-2. This demonstration of Mendelian inheritance is essential for accurate interpretation of allozymic variation among natural populations of this pelagic species.

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