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A system for model-based biomass estimation of larvae in intensive cod larvicultures

Alver, Morten O., Alfredsen, Jo A., Øie, Gunvor
Aquaculture international 2005 v.13 no.6 pp. 519-541
Gadus morhua, biomass, cod (fish), feed intake, foods, larvae, larval development, models, mortality, rearing
High and unpredictable mortality rates are observed in the larval rearing of cod (Gadus morhua). As a means of addressing this problem, we present a model-based estimator system which can be used to indirectly measure the larval density through monitoring the live food dynamics and larval growth. The estimator has been evaluated in a conceptual context using a preliminary model formulation, and the observability of the process has been investigated. It was found that the two parameters, live food dynamics and larval growth, contain enough information for the larval density to be estimated under noisy conditions, given the correct model. When the system is applied practically, the estimation error will depend on the measurement and model accuracy; this is especially true with respect to the predictability of the feed intake rate of the fish.