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The eulachon (/ ˈ j uː l ə k ɒ n / (Thaleichthys pacificus), also spelled oolichan / ˈ uː l ɪ k ɑː n /, ooligan / ˈ uː l ɪ ɡ ə n /, hooligan / ˈ h uː l ɪ ɡ ə n /), or the candlefish, is a small anadromous species of smelt that spawns in some of the major river systems along the Pacific coast of North America from northern California to Alaska.
Females produce about 100,000 to 300,000 eggs per year, presumably after 2 to 3 years of growth with an average size being 11.8 inches (30 cm) [7] Spawning is thought to occur in the depths of main channel over coarse sand-gravel bars. [11] Spawning temperature range is between 16 and 21 °C (61 and 70 °F). Eggs are broadcast over the ...
Females release an average of 1000 eggs. The eggs are spherical and small compared to other freshwater species and have a drop of oil to increase buoyancy. Fertilized eggs float to the surface and usually bind to floating vegetation, becoming larvae. Biting fish reach sexual maturity of three to five years. [11] [12]
The males do this because females will eat the eggs right after spawning if the male does not run her off. [14] The males continue to protect the eggs until they have absorbed their yolk sac and are ready to distribute themselves. [15] Mottled sculpins only mate once a year. The clutch size can vary anywhere from 8 eggs to 148 eggs for females.
Life for the Eurasian ruffe, starts as an egg, like other fish. Egg sizes typically range from 0.34 to 1.3 mm (0.013 to 0.051 in) in diameter , depending on the size of the female. [ 9 ] If the same female has a second batch in the same season, the eggs will be smaller than the first batch.
The eggs have an average diameter of 1 millimetre (0.039 in). The eggs are generally surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish have thick, leathery coats, especially if they must withstand physical force or desiccation. These type of eggs can also be very small and ...
Spawning takes place in spring and summer. Females spawn 40–125 eggs over 7–9 days, generally depositing them at the base of aquatic vegetation. [4] When the young honey blue-eyes hatch, they will usually feed from the surface of the water. The life span of the species is around 1–2 years in the wild, and around 2 years in aquariums. [4]
Pacific ladyfish are pelagic, marine forms preferring either brackish or fresh water unless they are breeding. They prefer specific water depths of no more than 8 m (26 ft). Little is known about the ecology of this species, but they are known to be highly carnivorous, feeding on smaller fish and crustaceans. [ 2 ]