. British and Irish Salmonidae. Salmon. SALMON—DENTITION AND PINS. 53 Teeth—in a single row in the jaws and palatines: rather stouter than those in the mandibles, while the are still smaller. In adults the teeth are often larger in those of the females, while there are from one to three teeth (unless all are absent) on or just behind the head of the vomer*: in grilse, should teeth be present, there are from one to three on the head and one or more in a single row along the body of that bone. But the numbers are very various so soon as the fish arrives at an age to commence its mig- rations sea
. British and Irish Salmonidae. Salmon. SALMON—DENTITION AND PINS. 53 Teeth—in a single row in the jaws and palatines: rather stouter than those in the mandibles, while the are still smaller. In adults the teeth are often larger in those of the females, while there are from one to three teeth (unless all are absent) on or just behind the head of the vomer*: in grilse, should teeth be present, there are from one to three on the head and one or more in a single row along the body of that bone. But the numbers are very various so soon as the fish arrives at an age to commence its mig- rations sea-wards. In the par andsmolt a double row exists along the body of Fig- Teeth 15. on Fig. Teeth 16. on vomer par, 7 long. of in. vomer grilse, lb. wt. of 3i the premaxillary ones being maxillary and palatine ones in the jaws of males than the vomer, while the hind edge of the head of that bone is armed with three or rarely four teeth placed in a single row: some of these commence being shed as the par is becom- ing a smoltjt and the loss rapidly increases in the grilse stage. As a rule there are less teeth on the head of the vomer of a salmon than exists in that of a trout of similar size. There are three to six recurved teeth on either side of the tongue. |. Fig. 17. Outlines of tail fins of salmon at various ages:— 1. Male par, 4-2 inches long; 2. Par, 5'2 inches long; 3. male par, 6-4 inches long; 4. male smolt, 7'8 inches long; 5. Grilse, 3} lb.; 6. Grilse, 4^ lb. * July 12th, 1886, a grilse of BJ lb. weight had two teeth on the head of the vomer and one on its body: vertebrae 59 -|- a;: one of 4^ lb. had only two on the hind edge of the head of that bone: while a large male sahnon, 26 lb. weight, had one tooth on the hind portion of the head of the vomer and a second on the commencement of the body of that bone. t In several par seven inches long taken in September, 1886, the teeth on the body of the vomer were commencing to take on a single row in all, for out of nin
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1887
