Faecal waste characteristics of yellowtail kingfish (Seriola lalandi) fed with pelleted and natural feed

• DOI: 10.1016/j.anifeedsci.2023.115625
• Publication Date: 2023-03-07T07:05:00Z
• Authors: Peter Horstmann; Roel M. Maas; Xander V. de Boer; Thomas W.O. Staessen; Fotini Kokou; Johan W. Schrama
• Keywords: Ingredient; Seriola quinqueradiata; Commercial fish feed

Yellowtail kingfish (Seriola lalandi) is a fast-growing fish species. One of the challenges farming yellowtail in recirculating aquaculture systems their poor faeces integrity, also referred to as ‘diarrhoea-like’ faeces. Whether diarrhoea-like occur under conditions when feeding on its natural feed items or are diet induced, unclear. This study assessed effect type (pelleted vs. feed) faecal characteristics and waste production kingfish. Three dietary treatments were studied over 35-d experimental period: pelleted based marine ingredients (Marine; open formula); an ingredient composition commercial (Commercial Dummy, CD; closed composed four, individually fed raw (unprocessed) dummy pellets at ratio 1:1 dry matter basis (Natural Commercial NCD). The NCD treatment was intended clarify whether naturally occurring Each tested four tanks, which stocked with 27 (mean initial weight 39 g). Fish apparent satiation twice daily for 1 h. For each tank nutrient digestibility measured. inclusion reduced (p < 0.001). Furthermore, integrity not (not diarrhoea-like). At treatment, excreted short strings, observed other treatments. Faecal collected from receiving only classified diarrhoea-like. highest removal efficiency by settling compared Consequently, lowest amount non-removed per intake 0.001) (62.9 g OM/kg OM FI), followed Marine (101.1 FI) Dummy (111.7 FI). In conclusion, this shows potential interventions alter waste. offers possibilities reduce total suspended solid load systems.