Demographic and competition studies on Brachionus ibericus and Proales similis in relation to salinity and algal (Nannochloropsis oculata) density

We isolated the rotifers Brachionus ibericus and Proales similis from the sediment of shrimp tanks and studied their individual demographic characters and competition between them at two food levels (0.25 × 10 6 , 1.00 × 10 6 cells ml −1 of Nannochloropsis oculata at 25 °C) and salinities ranging fr...

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Bibliographic Details
Published in:Aquaculture international 2018-04, Vol.26 (2), p.629-644
Main Authors: Rebolledo, Uriel Arreguin, Nandini, S., Sarma, S. S. S., Reyes, José Cristóbal Román, Montes de Oca, Gustavo Alejandro Rodríguez
Format: Article
Language:English
Subjects:
Algae
Aquaculture
Biological competition
Biomedical and Life Sciences
Brachionus
Cells
Competition
Fecundity
Females
Food
Foods
Freshwater & Marine Ecology
Growth rate
Life history
Life Sciences
Life span
Longevity
Marine crustaceans
Marine invertebrates
Nannochloropsis oculata
Population dynamics
Population growth
Proales similis
Rotifera
Salinity
Tanks
Zoology
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Summary:We isolated the rotifers Brachionus ibericus and Proales similis from the sediment of shrimp tanks and studied their individual demographic characters and competition between them at two food levels (0.25 × 10 6 , 1.00 × 10 6 cells ml −1 of Nannochloropsis oculata at 25 °C) and salinities ranging from 10 to 30‰. Our hypothesis was that growth rates would be higher with increasing food levels and salinities. Observations were taken twice a day for life table studies and daily once for population growth experiments. Using survivorship and fecundity data, we derived various life history variables. Although the average life span (7.6 ± 0.4 days) and gross reproductive rate (33.8 ± 2.9 neonate female −1  day −1 ) of B. ibericus were higher than those of P. similis (average life span 5.4 ± 0.6 days and gross reproductive rate 13.0 ± 0.6 neonate female −1  day −1 ), the population growth experiments showed that P. similis had higher r values (0.32 ± 0.005 day −1 ) than B. ibericus (0.23 ± 0.002 day −1 ) at 1.0 × 10 6 cells ml −1 of N. oculata . The rotifer P. similis was more adversely affected due to the presence of B. ibericus than vice versa. The data are important for developing techniques for a large-scale culture of these rotifers as food in aquaculture.
ISSN:0967-6120
1573-143X
DOI:10.1007/s10499-017-0233-z