Marcy, 1972


Marcy, B.C.Jr. (1972) Spawning of the American shad, Alosa sapidissima in the lower Connecticut River. Chesapeake Sci., pp. 116-119

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Alosa sapidissima Egg Egg Buoyancy Calculations based on eggs ages when collected indicate most eggs traveled only 1 to 4 miles from where spawned. Pelagic
Alosa sapidissima Egg Incubation time Eggs were fertilized and reared in the laboratory at temperatures similar to those in the river (13.8-23.0°C). Hatching occurred 71 to 86 hours after fertilization 18.4 days
Alosa sapidissima Spawning conditions Spawning season Spawning occurred between 13 May and 27 June, the peak being June in 1967 and May in 1968. ['May', 'June']
Alosa sapidissima Spawning conditions Spawning temperature Mean water temperature was 11°C in May 1967 and 15°C in May 1968 11.0 °C
Alosa sapidissima Spawning conditions Spawning water type Current velocities ranged from 0.5 to 2 ft/sec. Flowing or turbulent water
Alosa sapidissima Spawning conditions Spawning depth Eggs were found at depths of 0.6 to 7.3 m. An almost equal number of eggs/hr were collected above 3 m as below 7.3 m
Alosa sapidissima Spawning conditions Nycthemeral period of oviposition Spawning was seen only on dark afternoons and during the evening Day
Alosa sapidissima Spawning conditions Mating system Spawning involves pairs of fish, or presumably several males and a single female. In group spawning, fish swam with their backs exposed. They splashed about forming a closely-packed circle Promiscuity