262 SALMONID^ OF BRITAIN. 



head and back; a few dark marks also on the sides of the head. Dorsal fin yellow, 

 with black spots and irregular bands, the upper portion of its anterior edge being 

 rather light with a dark base. Adipose dorsal with a black base and two black 

 spots one above the other. Pectoral black-tipped. Anal with the three first 

 rays white, posterior to which the fin is stained with dark gray, especially in its 

 outer portion. Caudal dark-edged, and with a few indistinct bars at its base. It 

 was a male with the milt very fully developed. 



November 12th, 1884. — Pond no. 3 at Howietoun was examined, and the 

 females of the zebra race were not quite ready for breeding, while they appeared 

 to be fewer in number than the males, some of which were ripe. On December 

 24th they were shifted to pond no. 5, a^ud 146 fish were present. September 

 8th, 1885, the largest removed with a landing net was 9| in. long. November 

 5th, 1885, on netting pond 5, all those examined appeared to be sterile, the 

 largest fish being 12| in. long. 



Zebra Hybrids, or between American char and Lochleven trout. 



Day, Proa. Zool. Soc. 1884, p. 379. 



November 29th, 1883. — Three thousand ova were taken from a Lochleven trout 

 of the season of 1875, and milted from a Salmo fontinalis. The number of dead eggs 

 removed was as follows : — December 80, January 66, February 25, or a loss of 

 161, while 296 were found not to have been impregnated, or a proportion of 

 one death to every 17 ova. These young fishes, in March, 1884, were much more 

 advanced than the young dropsies {see p. 259 ante). June 24th, they were removed 

 to the 20 ft. tank near the "Despatch House," where they continued until May 6th, 

 1885, when they were shifted to pond no. 3 ; on June 20th, they were again 

 moved to pond no. 8 ; they now numbered 161. September 8th, a net full was 

 removed, and the largest fish in it was 6f inches long ; on November 26th, they 

 were transferred to pond no. 5. On October 15th, 1886, one 15 inches long, which 

 died of fungus, had milt fairly well developed.* 



Leopard Hybrids, or between Lochleven trout and American char. 



Day, Proa. Zool. Soc. 1884, pp. 31, 32, 379. 



November 15th, 1882. — Eight thousand ova of an American char, Salmo 

 fontinalis, were fecundated with the milt of a Lochleven trout. They hatched on 

 February 7th, or in 84 days; the mortality during incubation was in November 28, 

 December 575, January 1818, February 297, of a total loss of 2718. The young 

 fry were greatly deformed , many had their spines crooked, atrophy was present in the 

 posterior portions of some, and a deficiency of the fins generally, more« especially 

 of the caudal. In May, 1883, the young were about 1 inch in length, and had 

 about 11 par bands, the foremost four of which were mostly below the lateral- 

 line, while the remainder generally crossed it.f On July 20th, the cross bands 

 had become wider passing downwards to the belly and upwards to the back, which, 

 however, they did not extend on to, but small and irregular bars descended 

 towards the interspaces between the cross bands. The broad cross bars on the 

 body were twice as wide as the interspaces, generally about nine in number, 



* December 13th, 1884.— Five hundred eggs, having a diameter 0-18 inches each, were 

 obtained from a dead sea trout which had been gaffed, the wound having extended into the 

 ovary, and possibly water also. The milt of a Howietoun grilse was added, they were put in 

 box 84c on March 1st, one hatched, and it was turned into box 92. On February 24th, 1887, 

 this fish was alive and well along with Salmo irideiis. 



t Sir James Maitland sent me one specimen 0-8 of an inch long ; its head and the anterior 

 part of its body were normal, but posterior to the dorsal fin a general atrophy had taken place, 

 and although the anal fin was fairly developed, the caudal portion was embryonic. It had six 

 bars along each side. 



