Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 52. (Budapest 1960)
Berinkey, L.: Further morphological and osteological investigations on the hybrids of Hungarian Cyprinids
According to Günther (9), it is characteristical of the hybrids that the pharyngeal teeth are strongly serrate, the mouth more or less oblique. The elongatedness, that is, elevation, of the body is considerably varying. The 7 dorsal fin is above the ventral. The scale number of the median line is 40 42, the number of fin-rays D. 13, A. 14—15. 4 Grot e — V o g t — H o f e r (8) complete the above characterization bv adding that the pharyngeal bones are thinner than those of the roach, and that the shoulder of the bone is as broad as in the rudd. The number of the pharyngeal teeth is varying. Jäckel found the following values in 24 specimens : 5—5 in 7 individuals, 5—5,1 in 3, 1,5—5,1 in 3, 6—5 in 3, 1,6—5,2 in 3, 1,5—5 in one, 2,5—5 in one, 5—5,2 in one, 3,6—5,2 in one, and 1,6—5 in one. Concerning the coloration of the hybrids, they state that the dorsal and anal fins are grey, the belly and the pectorals are yellow or reddish. There are 4 specimens of this hybrid in the Ichthyological Collection of the Zoological Department of the Museum. Their data are as follows : Nr. 1—4. Tiszapolgár, the river Tisza, 26 May 1959, leg. I. Vásárhelyi; Inventory number : 59.223.1/1. 2. 3. 4. I let made osteological preparations from Nr. 1. and 3. The most conspicuous feature of the hybrids is that the upper portion of the head is not arched (as in the roach), but straight, yet the angle of its slope is similar to that of the roach ; the mouth turns upward, but not as much as in the rudd. The dorsal fin begins midway between the ventral and anal fins, while the anal begins (on Nr. 2. and 4.) at a small distance behind the line denoting the end of the dorsal, or immediately behind it on Nr. 1. and 3. There is a scaled ridge between the ventral and anal fins on every specimen. The fin-ray and scale formulas of the hybrids are as follows : Nr. 1. : lin. lat. 41 , D. III 8, A III 10; Nr. 2.: lin lat. 38 -, D. III 8, A. III 10; Nr. 3.; 3 7 3 n lin. lat. 40 , D. III 8, A. III 10.; Nr. 4.: lin. lat. 38 , D. III 8, A. III 11. 3 3 The number of oblique scale series agrees with that of the minimal scale-numbers of the rudd in Nr. 2. and 4., while the scale numbers of Nr. I. and 3. are identical with those of both parental species and thus their character cannot be established. The number of longitudinal scale series is uninteresting, due to the same cause. The numbers of the rays of the dorsal fin are decidedly of a rudd character. The same number of the anal is also devoid of interest because of its identical value with those of the parents. The specimens studied by me deviate from the description given by G ü n t h e r (9) in the value of the numbers of the oblique scale series, and in the position of the dorsal fin. According to the above author, the position of the dorsal fin shows a rudd character, to wit, it lies above the ventral one, while it is, in all of my specimens, between the ventral and anal fins, similarly to the roach. In this regard, either one or the other parental feature is obviously the dominating one. The number of the branchial spines on the first arch is 10 in the roach, 11—12 in the rudd, and uniformly 10 in the hybrids, — a wholly roach character. The measurement data of the two parent-species are given in Table II. It shows the averages of the values measured on the parental species as well as the individual and average values of the hybrids. I tabulated those measurements only which are deemed as important.
