Factors affecting the food value of diatom strains for post-larval abalone Haliotis iris

Kawamura, Tomohiko; Roberts, Rodney D.; Nicholson, Christine M.

doi:10.1016/s0044-8486(97)00223-8

Cited by 69 publications

(45 citation statements)

References 11 publications

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“…Individuals of a cohort, alike in age and grown under the same conditions, present a heterogeneous distribution of sizes. Examples have been described for clams (Malinowski 1988), oysters (Pit and Souhgate 2003), abalone (Kawamura et al 1998;Mgaya and Mercer 1995;Steinarsson and Imsland 2003;Heath and Moss 2009), among others. Given the variances in the growth rates, a cohort attains a specific market size in different spans, which affects the efficiency of production (Malinowski 1988).…”

Section: Introductionmentioning

confidence: 99%

Bioeconomic effect from the size selection in red abalone intensive culture Haliotis rufescens as a production strategy

et al. 2011

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The variability in growth is a common characteristic in mollusks breeding. Effects rising from the variability in the individual growth rate and the consequent dispersion of sizes in cultivation are important in financial terms. To manage this heterogeneity many firms use size selection, which can happen in two stages: toward the end of the stage of growing, or in the phase of growing of seeds. A bioeconomic model simulating the operation of a firm producing red abalone was implemented in spreadsheets. The firm produces 70 tons yearly. The model was structured in three sub-models. A biological sub-model detailed a batch's dynamics, in terms of survival and growth, considering individual variation of size around a central value for each age. A technological sub-model described raw materials, the quantity of food and the energy required. Finally, the simulation model is completed with an economic integrated sub-model, where net present value is calculated considering income and costs over the time. Results of the alternative production strategies (with or without selection) are assessed according to: quantity of larvae and necessary spawners to reach the desired level of production; net present value (NPV) and necessary time to recover the investment. The number of larvae was approximately 17 millions larger for the case of the strategy of production with sizes selection and 73% more of available spawners is required for this larger amount of larvae. In the short term, the size-selection strategy increases the production costs at the initial time, compared with the strategy without selection. However, in the long term, this strategy generates greater NPV. The span for investment recovery was shorter for the case of the strategy with size selection and living product (nearly 2,140 days) than frozen (nearly 2,232 days); while without sizes selection a 15-year simulation showed the investment is not recovered. Finally, could be verified that size selection can be an interesting strategy to explore, since it improves the financial result, the same way other more expensive technological changes would.

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Section: Introductionmentioning

confidence: 99%

Bioeconomic effect from the size selection in red abalone intensive culture Haliotis rufescens as a production strategy

et al. 2011

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“…For instance, Kawamura & Takami (1995) reported very low digestion efficiency (8.5%) for a certain species of Nitzschia. In a subsequent study, however, Nitzschia ovalis was observed to have a digestion efficiency of 32.3% while another species of Nitzschia had a rather high digestion efficiency of 92.7% (Kawamura et al, 1998). These studies simply demonstrate the varying digestion efficiencies among different species of Nitzschia alone and possibly similar nature or disposition may hold true for other diatom species.…”

Section: Introductionmentioning

confidence: 79%

“…These cues can be an appropriate substrate (Woodin, 1991;Hadfield et al, 1994), a food source (Hadfield, 1978;Garland et al, 1985) or a biochemical signal (Hadfield, 1977;Pavlik, 1992). Benthic diatoms are important components in the haliotid diet where extracellular substances from these microalgae served as essential food of the young postlarval abalone (Kawamura & Takami, 1995;Kawamura, 1996;Takami et al, 1997a, Kawamura et al, 1998. The inductive effects of the chemical compound, GABA, on the larval settlement and metamorphosis of temperate, semi-tropical or tropical abalone species are well documented (see Morse et al, 1979;Morse & Morse, 1984;Barlow, 1990;Searcy-Bernal et al, 1992;Yang & Wu, 1995;Roberts & Nicholson, 1997;Searcy-Bernal & Anguiano-Beltran, 1998;Bryan & Qian, 1998;Gapasin & Polohan, 2004).…”

Section: Introductionmentioning

confidence: 99%

Response of the Tropical Abalone, Haliotis asinina, Larvae on Combinations of Attachment Cues

Gapasin

Polohan

2005

Hydrobiologia

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The effects of different diatom species and types of substrates in combination with 0.45 lM GABA on the metamorphosis of Haliotis asinina larvae were tested. Diatom slurry elicited the best metamorphic response followed by Amphora sp., Amphora + Nitzschia and Nitzschia cf. frustulum in that order. With regards to substrate types, roughened plexiglass seemed to be the most preferred while fibrocement the least preferred surface. Overall, diatom slurry grown on plexiglass surface promoted the greatest number of metamorphosed H. asinina postlarvae. For economic considerations and practical reasons, chemical inducers like gamma-aminobutyric acid (GABA), should be used singly or separately from other settlement-inducing cues, such as the ''substrate-diatom'' complex.

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“…A limited number of diatoms showed high digestion efficiencies and induced rapid growth in larger postlarvae 14,15,28 . Attachment strength of diatoms was one of the factors that affected the diatom digestibility for postlarval abalone.…”

Section: Changes In Digestibility Of Diatomsmentioning

confidence: 99%

Dietary Changes in the Abalone, Haliotis discus hannai, and Relationship with the Development of the Digestive Organ

Takami

Kawamura

2003

JARQ

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The feeding habits of the Ezo abalone, Haliotis discus hannai, changed with growth. Three major changes in the feeding of H. discus hannai were identified by reviewing recent studies on the feeding habits of this species. The first change occurred at the time of the metamorphosis, namely a shift from lecithotrophy to particle feeding. In the second change, when the shell length (SL) reached values of about 0.6-0.8 mm, post-larvae were able to digest diatom diets and they grew more rapidly on efficiently digested strains. The final change consisted of a shift from a biofilm-dominated diet to a macroalgal-dominated diet. Post-larval abalone (> 1.8 mm SL) were able to utilize juvenile macroalgae efficiently. These changes in the feeding habits were closely related to ontogenetic changes in the digestive enzyme activities and the development of the radula morphology.

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Factors affecting the food value of diatom strains for post-larval abalone Haliotis iris

Cited by 69 publications

References 11 publications

Bioeconomic effect from the size selection in red abalone intensive culture Haliotis rufescens as a production strategy

Bioeconomic effect from the size selection in red abalone intensive culture Haliotis rufescens as a production strategy

Response of the Tropical Abalone, Haliotis asinina, Larvae on Combinations of Attachment Cues

Dietary Changes in the Abalone, Haliotis discus hannai, and Relationship with the Development of the Digestive Organ

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