12/31/2023 0 Comments Circuli vs annuli![]() The posterior field is clear and some circuli may extend into it. They are generally continuous between the lateral and anterior fields, but a small number of discontinuous circuli can be present. The circuli are concentric with the scale outline. Overall Scale Shape: circular to somewhat oval anterior field, the posterior field can be irregular.įocus and Circuli: focus is clearly defined and often centralized between the fields often just anterior to the interface of the posterior field. Position of Scale on Body: in rows above the lateral line canal 118-147 also on the lateral line canal 121-140 ( Hart, 1973). Predators: larger fish species including other salmon (on young), sea birds, marine mammals, and terrestrial mammals.ĭistribution: North Pacific Baja, California to Alaska to Kamchatka, to Korea. ![]() Season: spawns in the fall (October-November) fry appear in spring and usually spend one year in freshwater (sometimes longer) smolts will spend time in inshore waters before retreating to deeper offshore waters.ĭiet: freshwater fry eat insects and larvae young at sea feed on coastal plankton (e.g., copepods) adults feed on other forage species (e.g., herring, sand lance, greenlings, eulachon) and various planktonic crustaceans (e.g., copepods, euphasiids), squid. Habitat: open Pacific offshore waters, coastal streams, and also lakes. Mouth: large, terminal, directed forward upper jaw extends beyond the posterior edge of orbit snout is narrow in both spawning males and females the jaws are hooked inwards lips fleshy, teeth well developed and needle-like no black colouration at the base of teeth, in spawning individuals the teeth become larger and hooked inwards (more expressed in the males).īody: elongate caudal peduncle compressed caudal fin slightly indented adipose fin small and slender 19-25 widely spaced gill rakers over the first gill arch.Ĭolor: metallic blue on dorsal with silver on the sides, the ventral area and the caudal peduncle black spots on the upper lobe of the caudal fin spawning males have bright red sides, bright green on the dorsal surface and head, with dark bellies. (Other common names: Silver Salmon, Hooknose)
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