[Footnote 4: The parts referred to in the key may be defined as follows: Anal fin, the single fin on the median line of the body, between the vent and the tail; gillrakers, bony protuberances on the concave side of the bones supporting the gills; branchiostegals, small bones supporting the lower margin of the gill cover; pyloric coeca, worm-like appendages of the lower end of the stomach; vomer, a bone in the front part of the roof of the mouth.]
I. Anal fin elongate, with 16 rays; gillrakers 9 +
15 to 19; pyloric coeca 140 to 180; caudal fin considerably
forked; average weight about 20 pounds, maximum 100 pounds.
Chinook or quinnat salmon (Oncorhynchus
II. Anal fin short, with 9 to 12 rays; gillrakers
8 + 12:
branchiostegals 11; pyloric coeca less than 70.
1. Teeth on vomer little developed,
those on shaft few and
deciduous; scales large, about 120 in lateral series;
pyloric coeca 65; caudal fin emarginate; average weight
15 pounds, maximum 40 pounds.
[Illustration: Atlantic salmon (Salmo salar)]
2. Teeth on vomer well developed,
those on shaft of bone
numerous and persistent in a zigzag row or two alternating
series; scales about 150 (130 to 180) in lateral series;
pyloric coeca 42; caudal fin squarely emarginate; average
weight 10 pounds, maximum 20 pounds.
[Illustration: Steelhead trout (Salmo gairdneri)]
Map showing the location of the salmon
weirs and traps fished in Penobscot River and Bay in
***End of the project gutenberg EBOOK the salmon fishery of Penobscot bay and river in 1895-96***
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