Maitland and Lyle, 2005



Citation


Maitland, P.S. and Lyle, A.A. (2005) Ecology of Allis Shad Alosa alosa and Twaite Shad Alosa fallax in the Solway Firth, Scotland. Hydrobiologia, pp. 305-221

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Alosa fallax Spawning conditions Mating system After spawning females move downstream again, whilst males remain awaiting the chance to spawn with other females No category
Alosa alosa Spawning conditions Spawning temperature 15-24 19.5 °C
Alosa fallax Spawning conditions Spawning period duration Males migrate to the spawning grounds first and wait there for the females which only move in when they are close to spawing No data
Alosa fallax Spawning conditions Spawning water type Lower reaches of the large accessible rivers along the coasts No category
Alosa alosa Female Maximum GSI value Max 21.63 21.63 percent
Alosa fallax Female Maximum GSI value 23.31 23.31 percent
Alosa alosa Male Maximum GSI value 8.6% 8.6 percent
Alosa fallax Male Maximum GSI value 11.82 11.82 percent
Alosa alosa Female Age at sexual maturity 3-5 [Male] 4.0 years
Alosa fallax Female Age at sexual maturity 3-5 [Male] 4.0 years
Alosa alosa Spawning conditions Spawning migration distance It originally migrated over 100 km upstream 100.0 km
Alosa alosa Spawning conditions Spawning season April-July ['April', 'May', 'July', 'June']
Alosa alosa Female Length at sexual maturity 48.1 48.1 cm
Alosa fallax Female Length at sexual maturity 36.4 36.4 cm
Alosa alosa Male Length at sexual maturity 42.1 42.1 cm
Alosa fallax Male Length at sexual maturity 34.1 34.1 cm
Alosa alosa Female Age at sexual maturity 4-6 [Female specified] 5.0 year
Alosa fallax Female Age at sexual maturity 4-6 [Female specified] 5.0 year
Alosa alosa Spawning conditions Parity Most die after spawning Semelparous
Alosa fallax Spawning conditions Parity Many twaite shad recover to spawn again next year No category