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Blueback herring spawn from late March through mid-May, depending on latitude. Females usually mature by age five and produce between 60,000 and 103,000 eggs. Males generally mature earlier at between 3 and 4 years of age and at a smaller size than the females.
River herring commonly refers to two species, Blueback herring (Alosa aestivalis) and alewife ((Alosa pseudoharengus)). Today, 1/2 million river herring and Rainbow smelt (Osmerus mordax) run up the river each year to spawn (although they are not able to ascend the fish ladders and only utilize the tidal portions of the river). [7] [9] [10]
Clupeidae is a family of clupeiform ray-finned fishes, comprising, for instance, the herrings and sprats.Many members of the family have a body protected with shiny cycloid (very smooth and uniform) scales, a single dorsal fin, and a fusiform body for quick, evasive swimming and pursuit of prey composed of small planktonic animals.
River herring, which are a mix of alewives and blueback herring, spend much of the year 150 to 200 miles offshore. There as well, they run into a gauntlet of predators, from seals and whales to ...
Spratelloides delicatulus, the blue sprat, also known as the delicate round herring, blueback sprat, or piha, is a species of marine ray-finned fish belonging to the family Spratelloididae, the small round herrings.
The New Zealand blueback sprat (Sprattus antipodum) is a herring-like, forage fish of the family Clupeidae found in the waters around New Zealand, between latitudes 37° S and 48° S, and longitude 166° E and 180° E, to depths of up to 50 m.
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The peritoneum is light-colored with spots [6] to dusky-appearing, [7] an internal feature that distinguishes alewife from blueback herring (Alosa aestivalis), which have a dark peritoneum. [6] The otolith is shaped like a letter "L", unlike its hooked shape in A. aestivalis . [ 9 ]