Olney, 2001



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Alosa sapidissima Spawning conditions Spawning period duration 10-12 [In most years, spawning begins in late February and ends in early June, But spawning duration are unknown] 11.0 weeks
Alosa sapidissima Female Maximum GSI value Mean 20.5, up to 35.4 20.5 percent
Alosa sapidissima Female Relative fecundity Average batch fecundity (the mean number of oocytes > 1.6 mm per kg of somatic weight) was estimated for six hydrated/running ripe females and ranged from about 20 000 to 70 000 eggs 1.6 thousand eggs/kg
Alosa sapidissima Spawning conditions Spawning migration distance As maturing fish migrate 100 km up the estuary to the freswater spawnig grounds 100.0 km
Alosa sapidissima Female Oocyte development Group-synchronous ovarian development Group-synchronous
Alosa sapidissima Egg Oocyte diameter >1.6 [Hydrated yolked oocytes] 1.6 mm
Alosa sapidissima Spawning conditions Spawning season In most years, spawning begins in late February and ends in early June ['February', 'June']
Alosa sapidissima Spawning conditions Homing Most sexually mature fish return to natal streams to spawn Present
Alosa sapidissima Spawning conditions Spawning release Batch spawner: an individual female spawns repeatedly during each spawning season [Spawning frequency (every four fays) is preliminary] American shad probably exhibit indeterminate fecundity, contradicting previous studies Mutliple
Alosa sapidissima Spawning conditions Parity Populations may be either semelparous in southern rivers from Florida to North Carolina or predominately iteroparous in more northerly rivers No category