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- Title
Dietary value of benthic diatoms for post-larval abalone Haliotis diversicolor associated with feeding transitions.
- Authors
Onitsuka, Toshihiro; Kawamura, Tomohiko; Ohashi, Satoshi; Horii, Toyomitsu; Watanabe, Yoshiro
- Abstract
The feeding behavior and growth of post-larval Haliotis diversicolor with initial shell lengths (SL) of approximately 500 μm (Exp. 1-1 and 1-2), 800 μm (Exp. 2), and 1200 μm (Exp. 3) were studied in a laboratory setting while they fed on four species of benthic diatom Achnanthes longipes, Cocconeis sublittoralis, Cylindrotheca closterium, and Navicula ramosissima. Exp. 1-1 and 1-2 revealed no marked differences in post-larval growth rates (mean 24–39 μm SL/day) among the diatom species. However, marked differences in growth rates among the species were revealed in Exp. 2 and 3. Three species, A. longipes, Co. sublittoralis, and Cy. closterium, produced faster growth (Exp. 2 mean 29–51 μm/day, Exp. 3 mean 36–44 μm/day) than N. ramosissima (Exp. 2 mean 18 μm/day, Exp. 3 mean 23 μm/day). Post-larvae fed N. ramosissima had lower digestion efficiency (42.8%) than those fed other diatom species (90.7–100%). Diatom extracellular substances appeared to be principally used from post-settlement to 800 μm SL, and diatom cell contents were required to produce rapid growth of larger post-larvae (>800 μm SL). It is likely that the availability of each diatom for post-larvae was affected by diatom morphology, attachment strength, frustule strength, and post-larval size.
- Subjects
ANIMAL feeding behavior; DIATOMS; HALIOTIS diversicolor; ABALONES; LARVAL physiology; DIGESTION; ANIMAL nutrition; ANIMAL species; DEVELOPMENTAL biology
- Publication
Fisheries Science, 2007, Vol 73, Issue 2, p295
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1111/j.1444-2906.2007.01335.x