【摘要】 <正> 滩头鱼Leuciscus brandli(Dybowski)又名三块鱼、远东雅罗鱼或勃氏雅罗鱼,为鲤科少有的河口性鱼类。繁殖季节溯河而上,在急滩上产卵,故名滩头鱼。在我国,分布于东北地区的图们江、绥芬河流域和台湾省。滩头鱼为图们江的主要经济鱼类之一。 有关滩头鱼的生物学研究,国内尚无正式报道。1977年4—10月,我们调查图们江流域的鱼类,同时收集了滩头鱼标本1,317尾,其中用于解剖的1,215尾材料,取自珲春河下游,滩头鱼主要产卵场东岗子(距图们江干流约1公里)。习性观察及人工授精工作均在更多还原

【Abstract】 The far-eastern dace, Leuciscus brandti (Dybowski). an anadromous cyprinid fish, is one of the most important commercial fishes in Tumen River. Morphologically, it differs from the sympatric but much less abundant species Leuciscus hakonensis Gunther in having more predorsal and lateral-line scales, and in having- the postocular commissure of the cephalic lateral-line system connected with the preoperculomandibular canal.Ecological studies were carried out in Douggangzi, one of the spawning grounds of the far-eastern dace, lying about 1 kilometer above the mouth of Hungchun River, a tributary of Tumen River, 95 kilometers away from the sea.Spawning takes place from early May to late July, but most frequently in June. Spawning fish are mainly 4 years of age, the smallest female collected being 27,8 mm in length, and the male 223 mm (one year younger). The individual absolute fecundity of fishes 284-405 mm in length and 326-432 g in weight varies from 17,760 to 57,037 (26500 on the average). Its relation to body length maybe described by N=284.9503L -64901.4263, and to body weight by N=55.6378W-3643.3953. Eggs, measuring 1.7-1.3 mm in diameter, are deposited on and adhere to the gravel bottom. At a temperature of 17-21.2℃, artificially fertilized eggs hatch out indoors in about 67 hours.Food ingested in river by this dace covers a broad range and consists mainly of humus, algae, zooplanktons, and benthic invertebrates. But the spawners seem to have 110 or a poor appetite.Scales were used for aging fish, though opercles and vertebrae were also studied for comparison. Three-year-old fishes measure on an average 259 mm in length, four-year-old 292 mm, five-year-old 330 mm, six-year-old 377 mm. These measurements are somewhat longer than the respective body lengths calculated by means of the scale radial lengths. The length-weight relationship for males may be calculated by the equation W=0.006745L2.2297, while for females by W=0.008913L2.2570Suggestions concerning fishery management and culture of this dace are proposed.更多还原