Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 52. (Budapest 1960)
Berinkey, L.: Further morphological and osteological investigations on the hybrids of Hungarian Cyprinids
either almost straight or only slightly curved, its ventral outline strongly arched. Its mouth is directed upwards, its eyes big. The pectoral and ventral fins are small, the pectorals do not reach the ventrals, with a scale-free edge between the ventral and the anal fins. The anal fin is of a medium length, its height strongly decreasing backwards. The caudal peduncle is long and low. The short dorsal fin begins midway between the ventral and anal fins. The anal fin begins in line with the end of the dorsal one, it is of a medium length, its edge straight, the height of the rays considerably decreasing backwards. The fin ray and scale formulas are : D. III—IV (7) 8 (9), A. Ill (14) (15) 16—19 (20), lin. lat. (45) 7—9 46 52 (53—55). Vertebrae 42—44 (45). Spinae branchiales 18—22. Dentés 3-4 pharyngeales 2,5—5,2, rarely 2,5—4,2, or 2,5—5,3. The teeth are weakly serrated, their ends slightly hooked. The coloration of the body is greenish-blue on the back, silvery shining on its sides and belly. Its scales fall off easily. The fins are grey. The body of the rudd (Scardinius erythrophthalmus) is squat, high. The dorsal edge is strongly arched. Its head and eyes are comparatively small. Its mouth opens strongly upwards, its jaw highly prognathous. The pectorals do not reach the ventrals. The dorsal fin begins midway between the ventral and anal fins. The anal fin is short, commencing well behind the end of the dorsal one ; the edge of the fin is concavely arched. The caudal peduncle is stocky, short and high. There is a line covered by scales on the belly, between the ventral and anal fins. The large scales are strongly affixed.The fin-ray and scale formulas are: D. Ill 8—9 (10), A. Ill (9) 10—11 (12), lin lat. (37) 38 ?_ 8 42 (43). Vertebrae 37—39. 3—4 Spinae branchiales 11—12. Dentés pharyngeales 3,5—5,3 ; the teeth are much flattened laterally, densely serrated, with a strong hook on their end. The coloration of the body is greenish-blue on the back, yellowish grey on the sides, and silvery white on the belly. The lower fins and the caudal fin are lively red. Two specimens of the hybrids of the two above species found their way into the Ichthyological Collection of the Hungarian Natural History Museum. Their data are as follows : Nr. 1—2. Rakaca, Meszes, 30—31 May 1959 ; inventory number : 59.222.l./l— 2. leg. L. B e r i n k e y. I found no differences in shape between the two specimens, they much resembled the bleak. The bodies of the hybrids are elongated, much flattened laterally ; the highest point of the body lies scarcely higher than in the bleak. The dorsal edge is almost completely straight, the ventral edge is strongly arched. The eyes are large, the mouth turns wholly upwards, but the jaw is not as prognathous as in the rudd. The pectorals and ventrals are longer than those of the bleak. The dorsal fin is high, it begins at one-third of the distance between the ventral and the anal fins, behind the ventral one. A scaly ridge extends between the ventrals and anals. The most conspicuous feature of the fish is the short anal fin, originating directly in line with the end of the dorsal fin, its height does not diminish backwards (as in the bleak), but its edge is straight. The caudal peduncle is long and high, higher than in the bleak. The scales are relatively large. The scales on the sides and the belly do not have the same vivid silvery shine as in the bleak. The lateral line is strongly arched. The fins are grey. Comparing the fin-rav formulas, the characteristic scale-number of the bleak is A. Ill (14—15) 16—19 (20), D. III—IV (7) 8 (9), while that of the rudd:
