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Show 1884.] ON RACES AND HYBBIDS AMONG THE SALMONID^*. 581 6. On Races and Hybrids among the Salmonidae.- Part III. By FRANCIS DAY. [Received November 24, 1884.] (Plates LVI. & LVII.) On May 20th I read a paper before this Society1 wherein I detailed the results of some experiments made at Howietoun on the breeding and hybridization of the Salmonidae. I now propose to continue their history up to the middle of November this year. It will be remembered that in December 1880 some ova and milt were obtained from Salmon in the Teith, which were subsequently hatched at Howietoun, and in their early life were kept in the central wooden pond, from which they were transferred to pond no. 72. During the month of May 1884 16 jumped out of the pond and were found dead, and in all their breeding-organs were observed becoming well developed. On August 28th an examination was made of pond no. 7, and a grilse of 1| lb. weight was removed. On being opened it proved to be a female with its ova well forward, the largest being 0*1 of an inch in diameter. The fish measured as follows :- Total length Length of head Length of pectoral fin Length of caudal fin Height of body Eyes, diameter Eyes from end of snout Eyes, apart Distance from snout to first dorsal fin 112 rows of scales along the lateral line, 10 from the adipose dorsal fin downward and forwards to the lateral line ; the rows of scales from the head to the base of the first dorsal fin irregular in their course. The longest outer caudal ray 2*2 inches, middle rays 1*0 inch ; length of the base of the first dorsal fin 1*6 inch, interspace between it and the adipose fin 3*4 inches. Caecal pylori 60, the longest 0*8 inch. Colours-two large black spots behind the eve, one on the upper portion of the preopercle and 2\ on the opercle ; numerous black spots on the body above the lateral line, and anteriorly a few halfway down to the abdominal edge, and some in one line posteriorly. Dorsal fin grey with a lightish edge, and a 1 See Proc. Zool. Soc. 1884, p. 376. 2 See Proc. Zool. Soc. 1884, pp. 20, 21. inch. 14*1 2*8 1*9 2*2 3*2 0*55 0*8 11 5*7 |
