Mayer et al, 1990


Mayer, I. and Shackley, S.E. and Witthames, P.R. (1990) Aspects of the reproductive biology of the bass, Dicentrarchus labrax L. II. Fecundity and pattern of oocyte development. J. Fish Biol., pp. 141-148

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Dicentrarchus labrax Egg Oocyte diameter The postvitellogenic oocytes rapidly increasing volume by about 250% until they reach the hyaline stage 1.0-1.1 mm 1.05 mm
Dicentrarchus labrax Egg Egg size after water-hardening 1.2 1.2 mm
Dicentrarchus labrax Egg Egg Buoyancy Small pelagic eggs Pelagic
Dicentrarchus labrax Female Relative fecundity 273-538 [Also 293-358, or 492-955] 405.5 thousand eggs/kg
Dicentrarchus labrax Female Absolute fecundity 290-2000.043 1145.02 thousand eggs
Dicentrarchus labrax Female Oocyte development Bass shows group-synchronous oocyte development, at least two populations ('clutches') of oocytes can be distinguished in the ovary Group-synchronous
Dicentrarchus labrax Female Onset of oogenesis Recruitment of primary oocytes into secondary (vitellogenic) growth, continues through August and September, by the end of which time the ovaries have reacehd maturity stage III. From mid-October, oocyte development starts to accelerate. ['August', 'September', 'October']
Dicentrarchus labrax Female Resting period From June to early August, oocyte development is minimal 3.0 months
Dicentrarchus labrax Spawning conditions Spawning season April-May [Nothern Bristol Channel] ['April', 'May']
Dicentrarchus labrax Spawning conditions Spawning season Main spawning period : April-May ['April', 'May']
Dicentrarchus labrax Spawning conditions Spawning release Fractional spawner [Once spawning has started, successive clutches appear to be recruited in quick succession from the large hetegogeneous population of smaller secondary oocytes. The first cluth contained 30-50% of the total number of seconday oocytes and that successive clutches contained relatively fewer oocytes. Spawn three or four seperate clutches in quick succession, successive clutches containing fewer oocytes. No secondary oocytes are 'held over' for the subsequent reproductive season.] Total