Journal
AQUACULTURE INTERNATIONAL
Volume 30, Issue 5, Pages 2343-2364Publisher
SPRINGER
DOI: 10.1007/s10499-022-00906-7
Keywords
Benthic diatoms; Early juvenile abalone; Feeding periodicity; Feeding preference; Grazing rates; Haliotis asinina
Categories
Funding
- Department of Science and Technology-Philippine Council for Agriculture
- Natural Resources Research and Development under the National Abalone Program of the Philippines [NR04M2009T]
- Aquaculture Department of the Southeast Asian Fisheries Development (SEAFDEC/AQD)
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This study evaluated the suitability of different diatom species as live food for early juveniles of Haliotis asinina. The findings suggest that Cocconeis sp., Nitzschia sp., Amphora sp., and N. ramosissima are suitable for feeding H. asinina early juveniles. This knowledge can contribute to the development of feeding protocols in hatcheries for maximizing production.
This study evaluated the suitability of five diatom species (Amphora sp., Cocconeis sp., Navicula ramosissima, Nitzschia sp., and Tryblionella sp.) as food to abalone Haliotis asinina early juveniles (5-mm shell length). Grazing periodicity, grazing rate, and feeding preference were measured; at the same time, abalone gut content was examined. Grazing incidence appeared to be continuous with significantly higher grazing intensity observed at nighttime from 6 p.m. to 10 p.m. (79%) than at daytime from 10 a.m. to 2 p.m. (40%) (p< 0.05). Grazing rates from 6 p.m. to 10 p.m. were significantly higher on N. ramosissima (1.6 x 10(5)) among diatom species but was not statistically different from Cocconeis sp. (1.1 x 10(5)) (p> 0.05). Broken cells of Amphora sp. (22%) were significantly higher in the gut of H. asinina compared to Cocconeis sp. (2.8%), N. ramosissima, (1.8%), and Tryblionella sp. (0.2%) although the abundance of Nitzschia sp. (6%) was not significantly different from Amphora sp. (p> 0.05). Early juveniles showed significant preference for Cocconeis sp. (18.6%), followed by Nitzschia sp. (16.2%), N. ramosissima (13.9%), and Amphora sp. (13.4%), with the least preference for Tryblionella sp. (7.8%). Survival of H. asinina was similar in 4 diatom species (46-71%) except in Tryblionella sp. (8-12%). These findings suggest that diatom species Cocconeis sp., Nitzschia sp., Amphora sp., and N. ramosissima are the suitable live food for H. asinina early juveniles. Knowledge from this study would contribute to the development of a feeding protocol that would maximize production of H. asinina early juveniles in the hatchery.
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