Growth, food conversion and agonistic behaviour in common dentex(Dentex dentex)juveniles fed on pelleted moist and dry diets.

Efthimiou, Stefan, Divanach, Pascal and Rosenthal, Harald (1994) Growth, food conversion and agonistic behaviour in common dentex(Dentex dentex)juveniles fed on pelleted moist and dry diets. Aquatic Living Resources, 7 (4). pp. 267-275. DOI 10.1051/alr:1994029.

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Abstract

Juveniles of the common dentex (Dentex dentex) (2.4 g mean weight), were grown over a 6 week period, fed exclusively on a commercial sea bream diet or an isocaloric moist pellet diet, which was produced on site. Ambient temperature (24.4-26.2 °C) and oxygen content (4.8-5.9 mg/L), as well as the relatively low stocking density (max. 2.62 kg/m3) provided favourable rearing conditions. Survival (63.8% vs 51.6%), specific growth rates (6.1% vs 4.5%) and food conversion efficiency (115.8% vs 76.3%) were considerably elevated in the group fed on moist pellets. The growth performance parameters recorded are considered to be favourable for aquaculture requirements. Agonistic behaviour (particular biting of the tail) was found to be the main cause of the continuous mortality that occurred in both feed groups (78% and 64.8% of total mortality in the dry- and moist-pellet group, respectively). These biting attacks targeted the smallest individuals in a tank, whose mean individual weight made up 49-62% (with dry pellet diet) and 28.9-46.6% (with moist pellet diet) of the respective mean weights. The results indicate a strong relationship between nutrition, size variation and agonistic behaviour in the rearing of cornmon dentex juveniles.

Document Type: Article
Keywords: Dentex dentex, Sparidae, feeding, survival, growth, food conversion, agonistic behaviour, aquaculture
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1051/alr:1994029
ISSN: 0990-7440
Date Deposited: 09 Apr 2018 13:34
Last Modified: 09 Apr 2018 13:34
URI: http://oceanrep.geomar.de/id/eprint/42650

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