Laboratory of Zoology, Department of Biological Applications and Technologies, University of Ioannina, 45 110, Ioannina, Greece.
J Fish Biol. 2010 Aug;77(3):570-84. doi: 10.1111/j.1095-8649.2010.02699.x.
The gynogenetic population of Prussian carp Carassius gibelio in Lake Pamvotis (north-west Greece) included a small percentage of males (2-3%). Cytogenetic analysis revealed heterogeneity of the population at the ploidy level: all females were triploid (modal chromosome number 156-162 chromosomes) while the males were either triploid (modal number 156-158 chromosomes) or tetraploid (modal number 200-214 chromosomes). Morphometric analysis revealed significant differences in body shape among these three groups. The males were more slender than females, while the triploid males could be discriminated from the tetraploid by the morphology of their caudal peduncle. The males attained a significantly lower asymptotic standard length (L(S)) (25.04 cm) than females (29.75 cm) and had lower exponent b of the L(S) and mass relationship. Under laboratory conditions, intraspecific crossings of C. gibelio males with females could give viable all-female offspring; in comparison with goldfish Carassius auratus males, the fertility of the C. gibelio males was generally reduced but remained highly variable among individuals.
帕姆沃提斯湖（希腊西北部）中的史氏鲟 Carassius gibelio 雌核发育种群中包含少量雄性个体（2-3%）。细胞遗传学分析显示，该种群在倍性水平上存在异质性：所有雌鱼均为三倍体（模式染色体数为 156-162 条），而雄鱼则为三倍体（模式染色体数为 156-158 条）或四倍体（模式染色体数为 200-214 条）。形态计量学分析显示，这三个群体的体型存在显著差异。雄鱼比雌鱼更为细长，而三倍体雄鱼可以通过尾柄的形态与四倍体雄鱼区分开来。雄鱼的渐近标准体长（L(S)）显著低于雌鱼（25.04 厘米比 29.75 厘米），且 L(S)和质量关系的指数 b 也较低。在实验室条件下，史氏鲟 C. gibelio 雄鱼与雌鱼的同种内杂交可产生完全为雌性的后代；与金鱼 C. auratus 雄鱼相比，史氏鲟雄鱼的繁殖力通常较低，但在个体间仍存在高度变异性。
