Journal
AQUACULTURE INTERNATIONAL
Volume 26, Issue 2, Pages 629-644Publisher
SPRINGER
DOI: 10.1007/s10499-017-0233-z
Keywords
Proales similis; Marine algae; Growth rates; Live food; Aquaculture
Categories
Funding
- PAPIIT [IN216315]
- FES Iztacala (Division of Investigation and Postgraduate Studies)
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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 x 10(6), 1.00 x 10(6) cells ml(-1) of Nannochloropsis oculata at 25 A degrees C) and salinities ranging from 10 to 30aEuro degrees. 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 x 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.
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