BIOTIC Species Information for Venerupis senegalensis
|Researched by||Will Rayment||Data supplied by||MarLIN|
|Refereed by||This information is not refereed.|
||Feeding method||Active suspension feeder
|Typical food types||Suspended organic matter, particularly unicellular algae||Habit||Burrow dwelling|
|Bioturbator||Flexibility||None (< 10 degrees)|
|Height||Insufficient information||Growth Rate||1.3 mm/month|
|Adult dispersal potential||100-1000m||Dependency||Independent|
|General Biology Additional Information||Abundance
Johanessen (1973a) recorded Venerupis senegalensis (studied as Venerupis pullastra) from a sheltered beach in Norway at a mean density of 31 individuals per 0.25 m². Potential production was calculated to be 20 g ash free dry weight per m²/year, including a loss of 9 g due to mortality.
Growth rate of Venerupis senegalensis varies according to environmental conditions. Quayle (1952) investigated growth rates of Venerupis senegalensis (studied as Venerupis pullastra) from Millport, Scotland. In the first year following settlement, mean monthly growth rate was 1.3 mm per month over the growing period of 6 months. Growth rate was found to increase for the first 4 years of life (maximum growth rate was ca 9 mm per season) after which it began to decrease. Within each growing season, growth rate was found to increase up to the point of spawning, after which it levelled off and then decreased. Johannessen (1973b) investigated growth of Venerupis senegalensis (studied as Venerupis pullastra) from a sheltered beach in western Norway. The spherical shell of the free swimming larvae developed into an oblong shape after settlement, presumably to aid burrowing. At a shell length greater than 40 mm, the shell shape tended towards a flattened circular form, the biological significance of which is unclear. The shell growth rate was found to be approximately constant (ca 15 mm per season) up to a shell length of 40 mm, after which it decreased. Short and/or young individuals were found to grow faster than long and/or old ones.
Beiras et al. (1993) investigated the effect of increasing food rations on Venerupis senegalensis (studied as Venerupis pullastra). Increased rations of algal food were found to increase ingestion rate and growth. This relationship was found to hold true up to the maximum ration of 300 algal cells/µl. However, at high food concentrations the returns diminished due to decreased absorption efficiency. The optimum food concentration for growth (i.e. maximum increase in biomass per unit weight of food) was 100 cells/µl.
|Biology References||Fish & Fish, 1996, Hayward & Ryland, 1995b, Hayward et al., 1996, Johannessen, 1973a, Johannessen, 1973b, Quayle, 1952, Beiras et al., 1993,|