Mathematical model for predicting oxygen concentration in tilapia fish farms

Abstract

The main aim of this research is to develop a mathematical model to predict the dissolved oxygen in recirculating aquaculture system. The oxygen consumption of the model through the fish respiration and nitrification and the oxygen addition of the model through oxygen generator and water pumping. The effect of different water temperatures (24, 26, 28, 30 and 32 °C) on the dissolved oxygen consumption through fish respiration, biofilter and nitrification and fish growth were studied. An experiment to measure oxygen consumed by fish respiration and biofilteration and fish growth with the growth period and to validate the model results was carried out. The oxygen consumption predicted by the model was in a good agreement with those measured by the system. The oxygen consumption by fish respiration ranged 12.04 to 47.53 g O2 m−3 h−1 experimentally, while it was from 12.01 to 46.06 g O2 m−3 h−1 theoretically. The predicted and measured oxygen consumption through biofilteration values ranged from 0.43 to 21.91 and 0.45 to 23.09 g O2 m−3 h−1, respectively. The individual fish weight from the system ranged from 3.00 to 209.52 g experimentally while it was from 3.00 to 226.25 g theoretically during the whole period.

Comparative Study of Flesh Quality, Blood Profile, Antioxidant Status, and Intestinal Microbiota of European Catfish (Silurus glanis) Cultivated in a Recirculating Aquaculture System (RAS) and Earthen Pond System

“…Water recirculation systems are a reliable technological source being used in aquaculture to intensify fish production. Depending on the species, it is known that one of the limiting factors in such systems is the oxygen concentration [ 30 , 38 , 39 ]. At the same time, the fish’s defensive antioxidant system can be influenced by the oxygen concentration and toxins in the water and the fish’s temperature, age, feeding behavior, stress, etc.…”

Osmoregulation performance, condition factor, and gonad maturity of tilapia (Oreochromis niloticus) in Cengklik reservoir, Boyolali

“…Kondisi perairan yang baik merupakan kebutuhan untuk kelangsungan hidup dan pertumbuhan ikan karena semua proses kehidupan ikan sangat bergantung pada kualitas lingkungan hidupnya (Devi et al, 2017). Oksigen terlarut atau dissolved oxygen (DO) adalah variabel kualitas air yang sangat penting pada budidaya ikan, dimana rendahnya DO dapat mengurangi nafsu makan yang kemudian mempengaruhi pertumbuhan (Khater et al, 2021). Konsentrasi DO optimum untuk pertumbuhan ikan nila adalah di atas 5 mg/L dengan DO minimum 3 mg/L, sedangkan kisaran pH antara 6,5 -9 adalah optimum untuk pertumbuhan ikan nila (Makori et al, 2017).…”