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  • 1.
    Hinchcliffe, James
    et al.
    University of Gothenburg, Sweden.
    Roques, Jonathan A. C.
    University of Gothenburg, Sweden.
    Roos, Josefin
    University of Gothenburg, Sweden.
    Langeland, Markus
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel. University of Gothenburg, Sweden; SLU Swedish University of Agricultural Sciences, Sweden.
    Hedén, Ida
    University of Gothenburg, Sweden.
    Sundh, Henrik
    University of Gothenburg, Sweden.
    Sundell, Kristina
    University of Gothenburg, Sweden.
    Björnsson, Björn Thrandur
    University of Gothenburg, Sweden.
    Jönsson, Elisabeth
    University of Gothenburg, Sweden.
    High protein requirements of juvenile Atlantic wolffish, Anarhichas lupus: Effects of dietary protein levels on growth, health, and welfare2024Ingår i: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective of the present study was to investigate the optimal dietary protein requirement and the effect of varying protein levels on the growth and health of juvenile, wild-caught Atlantic wolffish, Anarhichas lupus, a promising candidate for cold-water aquaculture diversification. Six iso-energetic (ca. 18.3 MJ kg−1), fish meal-based experimental diets were formulated with crude protein levels ranging from 35% to 60%, with graded increments of 5% in a 12-week feeding trial in a recirculating aquaculture system (RAS). Weight gain, specific growth rate (SGR), and condition factor (K) were evaluated in response to dietary protein levels. Liver, muscle, and blood parameters were assessed for possible changes in protein and lipid metabolism and welfare. Overall growth was highly variable throughout the experiment on all diets, as expected for a wild population. The feed with highest in protein (60%) inclusion resulted in the highest growth rates, with an average weight gain of 37.4% ± 33.8% and an SGR of 0.31% ± 0.2% day−1. This was closely followed by feeds with 55% and 50% protein inclusion with an average weight gain of 22.9% ± 34.8% and 28.5% ± 38.3%, respectively, and an SGR of 0.18% ± 0.3% day−1 and 0.22% ± 0.3% day−1, respectively. Fish fed the high protein diets generally had increased hepatic lipid deposition (17%–18%) and reduced free fatty acid levels (3.1–6.8 μmol L−1) in the plasma relative to fish that were fed the lower protein diets (35%–45%). No effects of diet were found on plasma protein levels or muscle protein content. Furthermore, stress parameters such as plasma cortisol and glucose levels were unaffected by diet, as were plasma ghrelin levels. Overall, these results suggest that a high protein inclusion in the diet for Atlantic wolffish is required to sustain growth with a minimum protein level of 50%.s.

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  • 2.
    Warwas, Niklas
    et al.
    University of Gothenburg, Sweden.
    Langeland, Markus
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Jordbruk och livsmedel. University of Gothenburg, Sweden.
    Roques, Jonathan A. C.
    University of Gothenburg, Sweden.
    Montjouridès, Marie
    University of Gothenburg, Sweden.
    Smeets, Jolie
    University of Gothenburg, Sweden.
    Sundh, Henrik
    University of Gothenburg, Sweden.
    Jönsson, Elisabeth
    University of Gothenburg, Sweden.
    Sundell, Kristina
    University of Gothenburg, Sweden.
    Fish processing side streams are promising ingredients in diets for rainbow trout (Oncorhynchus mykiss) – Effects on growth physiology, appetite, and intestinal health2023Ingår i: Journal of Fish Biology, ISSN 0022-1112, E-ISSN 1095-8649Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Due to the growth of aquaculture and the finite supply of fishmeal and oil, alternative marine protein and lipid sources are highly sought after. Particularly promising is the use of side streams from the fish processing industry, allowing for the recovery and retention of otherwise lost nutrients in the food production chain. The aim of the present study was to evaluate the potential of three fish processing side streams as fish feed ingredients. The side streams originated from different stages of the production chain, were used without further processing, and included sprat trimmings (heads, frames, viscera), marinated herring (fillets) and mackerel in tomato sauce (fillets and sauce). The three side streams contained moderate levels of protein (28–32% dry matter) and high levels of lipid (34–43%). The sprat trimmings included ca. 29% ash and 1.5% phosphorous which may add value due to the high level of essential minerals but needs to be considered in feed formulations. Three diets were formulated to include 50% of each side stream replacing all fishmeal and ca. 80% of the fish oil of the control diet, which contained 35% fishmeal and 10% fish oil. The diets were evaluated in a 12-week feeding trial using rainbow trout (Oncorhynchus mykiss). Fish fed the sprat diet displayed the highest feed intake and growth, and showed no negative effects on the intestinal health. The mackerel side stream displayed a good digestibility but resulted in lower growth rates compared to the sprat trimmings. Fish fed the herring diet, displayed the lowest performance regarding growth, feed intake and digestibility. They further exhibited a reduction in nutrient uptake in both proximal and distal intestine, likely contributing to the observed lower digestibility and growth, and a reduction in plasma ghrelin levels. As part of a circular approach to increase marine lipid and protein production for fish feed, the tested sprat and mackerel side streams are promising raw materials however additional studies using more commercial-like feed formulations are encouraged.

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