Passing times of two types of feeds in wels (Silurus glanis) at three different temperatures

• Published in: Aquaculture international Vol. 21; no. 4; pp. 861 - 867
• Main Authors: Havasi, Máté, Oláh, Tamás, Felföldi, Zoltán, Nagy, Szabolcs, Bercsényi, Miklós
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.08.2013; Springer Nature B.V
• Subjects: Aquaculture; Aquariums; Biomedical and Life Sciences; Body weight; Feeds; Fish; Forage; Freshwater & Marine Ecology; High temperature; Life Sciences; Low temperature; Metabolism; Physiology; Silurus glanis; Variance analysis; Water quality; Water temperature; Zoology; Hungary; Pannonia; Wels; Temperature; Feed passing time
• ISSN: 0967-6120; 1573-143X
• DOI: 10.1007/s10499-012-9564-y

Passing times of two different types of feeds were determined in cases of wels ( Silurus glanis ) by measuring the body weight at three different temperatures. Fingerlings, 38.03 ± 8.04 g, were fed by an artificial dry feed (commercial catfish feed) or forage fish. The treatments were carried out (11 fish/aquaria) in 3 replicates. Fish were individually tagged by pit tags. Temperatures applied were the following: 15, 20 and 24 °C. The appetite of fish highly depended on temperature. At 15 °C, only 42.4 % of the experimental fish accepted the granulated feed, while this ratio was 90.9 % in the forage fish fed group. At higher temperatures, 100 % of the experimental fish accepted feed in both feeding groups. The daily mean value of consumed feed at 15 °C was 3.20 % of body weight in the case of forage fish and 1.36 % in the case of dry feed. At 24 °C, this ratio was 10.68 % of body weight in cases of forage fish and 4.46 % in cases of artificial feed. At low temperature (15 °C), the quantity of consumed feed met the measurement’s error threshold, which made the determination of passing time uncertain. At 20 °C, the evacuation started 20 h after feeding and lasted for 18 h, while at 24 °C, it started 11 h after feeding and lasted for another 16 h.