Blue mussel meal as feed attractant in rapeseed protein-based diets for turbot (Psetta maximaL.)

Abstract

Antinutritional factors in rapeseed products have been identified to reduce feed palatability and growth performance of turbot. Therefore, we evaluated the potential of blue mussel (Mytilus edulis L.) meal as feed attractant in rapeseed protein-based diets for turbot. Triplicate fish groups received isonitrogenous and isocaloric diets with fish meal (FM) protein replacements of 50% or 75% by rapeseed protein concentrate (RPC 50, RPC 75). These diets were supplemented with 0%, 2%, 4% or 8% of blue mussel meal. In contrast with RPC 50 diets, fish fed with RPC 75/0 showed significantly reduced daily feed intake (DFI) and specific growth rate (SGR). With increasing mussel meal inclusion, RPC 75 diets resulted in increased DFI and SGR, suggesting mussel meal as attractant in rapeseed proteinbased diets for turbot. Feed conversion was unaffected by any treatment. Protein productive value and apparent digestibility coefficients were unaffected by either RPC or mussel meal inclusion. With regard to the whole body composition, no differences in crude protein, crude lipid and ash content could be determined. Haematological characteristics were unaffected among the treatments indicating good nourished and unstressed fish. In conclusion, we demonstrated that the utilization of blue mussel meal improved the palatability of rapeseed protein-based diets for turbot.

Partial replacement of fishmeal in diets for turbot (Scophthalmus maximus, Linnaeus, 1758) culture using blue mussel (Mytilus edulis, Linneus, 1758) meat

“…The HSI (1.41 and 1.45) is in the normal range for turbot (Fournier et al., ; Nagel et al., , ; Peres & Oliva‐Teles, ), indicating a good status of energy reserves and no impairment of the health status. The SGR in experiment A is comparable to the SGR in other studies with turbot of the same size (Fuchs et al., ) and seems to be quite good in the 0% diet, which proves the good quality of our test diet.…”

“…Our results indicate that replacement of 10%–25% fishmeal with mussel meal can be recommended in feed for turbot raised in aquaculture. Previous studies already recommended mussel meal as a feed attractant in lower concentrations (Kikuchi et al., ; Nagel et al., ) to disguise an unfavourable taste in plant‐derived alternative protein sources and to encourage feed uptake. A feed formulation combining non‐fish marine protein sources and plant‐derived proteins should be in the focus of future feed stuff research.…”

Administration of host‐derived probiotics does not affect utilization of soybean meal enriched diets in juvenile turbot (Scophthalmus maximus)

“…This is in line with the findings of several other studies on turbot. Here, growth performance and feed conversion were negatively affected by the administration of various plant proteins in general (Fournier, Huelvan, & Desbruyeres, ; Nagel et al, ) or SBM and mixtures of both in particular (Bai et al, ; Bonaldo et al, , ; Gu et al, ; Sevgili et al, ; Yun, Mai, Zhang, & Xu, ).…”

“…Here, we could not detect an obvious aversion against any of the diets offered. The proper palatability was possibly achieved by supplementing our experimental diets with an attracting mussel meal (Nagel et al, ). Only in the SBM + degrad treatment we recognized that fish occasionally disgorged a few feed pellets.…”

A review of the multiple benefits of mussel farming

“…Nagel et al . () demonstrated that the utilization of mussel meal improved the palatability of rapeseed protein‐based diets for turbot, and Mazzoni et al . () used mussel meal as gustatory stimulants to improve the palatability of commercial diet for sole.…”