Beitrag
Aspects of the population ecology of a tropical freshwater atyid shrimp Caridina fernandoi ARUD. & COSTA, 1962 (Crustacea: Decapoda: Caridea)
Kumari De Silva, P.; De Silva, K. H. G. M.
Archiv für Hydrobiologie Volume 117 Number 2 (1989), p. 237 - 253
19 Literaturangaben
veröffentlicht: Dec 20, 1989
DOI: 10.1127/archiv-hydrobiol/117/1989/237
ArtNo. ESP141011702007, Preis: 29.00 €
Abstract
A population of Caridina fernandoi in a small reservoir in Sri Lanka was studied for two years by monthly sampling. The breeding and recruitment of the shrimp continued throughout the year, but was enhanced during the rainy period probably because of the availability of increased number of suitable habitats during this period. The male to female sex ratio of the population was 0.9. Females grew to a larger size than males and there were more females than males in the higher length classes. Females appear to grow faster than males, and males appear to have a higher mortality rate in the higher length classes. Brood size, which varied between 98—271, was positively correlated with body length. Life expectancy of the shrimp is about one year. The density of shrimps in the lake littoral was extremely low, possibly because of the paucity of macrophytes in the lake.
Schlagworte
Sri Lanka • macrophytes • shrimp • Caridina fernandoi