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Registros recuperados: 7
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Agonistic behaviour and feed efficiency in juvenile Nile tilapia Oreochromis niloticus ArchiMer
De Verdal, Hugues; O'Connell, Catherine Maeve; Mekkawy, Wagdy; Vandeputte, Marc; Chatain, Beatrice; Bégout, Marie-laure; Benzie, John A.h..
Given the strong effects of behavioural hierarchies on growth in many cultured species and the key role of feed efficiency in aquaculture economics, understanding the nature of the interaction of these variables is important for the sustainability of aquaculture. The relationship between agonistic behaviour, growth and feed efficiency in Nile tilapia, Oreochromis niloticus, was studied by rearing 120 fish in eight aquaria. Fish were video-recorded to estimate the occurrence of agonistic behaviour during a fasting and a refeeding period. Growth, feed intake and feed conversion efficiency (FCE - calculated as the inverse of feed conversion ratio (FCR)) were subsequently measured individually for each fish. Fish showed 58% less agonistic traits during the...
Tipo: Text Palavras-chave: Agonstic behaviour; Feed efficiency; Nile tilapia; Performances; Correlation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00483/59495/62363.pdf
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Estimation of body weight of European sea bass (Dicentrarchus labrax) and Nile tilapia (Oreochromis niloticus) larvae by image analysis ArchiMer
De Verdal, Hugues; Vandeputte, Marc; Pepey, Elodie; Vidal, Marie-odile; Ouedraogo, C; Canonne, Marc; D'Cotta, Helena; Baroiller, Jean Francois; Baras, E; Chatain, Beatrice.
The present study aimed to develop nondestructive methods to accurately follow the growth of fish larvae and post-larvae. European sea bass (Dicentrarchus labrax) aged 71-100 days post fertilization (dpf; 20-419 mg) and Nile tilapia (Oreochromis niloticus) aged 14 dpf (10-25 mg) were used as model species. Several measurements were performed on digital pictures of larvae to model body weight. Using body surface area, contour, length and depth, it was possible to estimate accurately the body weight of young European sea bass and Nile tilapia (r² of 0.98 and 0.95, respectively).
Tipo: Text Palavras-chave: Image analysis; Body weight; Surface area; European sea bass; Nile tilapia.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00205/31619/30045.pdf
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Improving feed efficiency in fish using selective breeding: a review ArchiMer
De Verdal, Hugues; Komen, Hans; Quillet, Edwige; Chatain, Beatrice; Allal, Francois; Benzie, John A. H.; Vandeputte, Marc.
Improving feed efficiency (FE) is key to reducing production costs in aquaculture and to achieving sustainability for the aquaculture industry. Feed costs account for 30–70% of total production costs in aquaculture; much work has been done on nutritional and husbandry approaches to improve FE but only a limited amount of research has been devoted to using genetics, despite its potential. This paper reviews past work to improve FE in fish using selective breeding and assess future directions. Direct selection on FE traits requires methods to measure individual feed consumption and estimate FE efficiently and accurately. This is particularly difficult to do in fish because of the environment in which they live. Many of the published studies on FE were found...
Tipo: Text Palavras-chave: Feed conversion ratio; Feed efficiency; Feed intake; Fish; Genetics; Selection.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00415/52675/53771.pdf
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Individual growth monitoring of European sea bass larvae by image analysis and microsatellite genotyping ArchiMer
De Verdal, Hugues; Vandeputte, Marc; Pepey, Elodie; Vidal, Marie-odile; Chatain, Beatrice.
The aims of the present study were to develop non-lethal methods to identify individual fish larvae and post-larvae before tagging and accurately follow their growth characteristics. European sea bass (Dicentrarchus labrax) was used as a model species at four different ages ranging from 71 to 100 days post fertilization (dpf). Two different methods were tested for non-lethal tissue sampling from each larva for DNA analysis: 1) using a sterile absorbent paper to sample mucus and/or epithelial cells by rubbing the fish skin and 2) fin-clip of the bottom part of the caudal fin. Whatever the age of the larvae, the genotyping rate (at 12 microsatellite markers) was low with the use of sterile absorbent paper but relatively high with fin-clip sampling at 80 and...
Tipo: Text Palavras-chave: Individual identification; Image analysis; Body weight; Surface area; Perimeter; European sea bass larvae.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00211/32195/30748.pdf
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Measuring individual feed efficiency and its correlations with performance traits in Nile tilapia, Oreochromis niloticus ArchiMer
De Verdal, Hugues; Mekkawy, Wagdy; Lind, Curtis E.; Vandeputte, Marc; Chatain, Beatrice; Benzie, John A. H..
Estimating individual feed intake of fish held in groups has long been a challenge precluding precise knowledge of the individual variation of feed efficiency (FE) in fish. In this study, counts of the number of feed pellets (1.63 mg on average) eaten by individual tilapia (Oreochromis niloticus) held in 8 mixed sex groups of 15 fish were measured from video recordings made over a period of 10 days where fish were fed twice daily to achieve compensatory growth after 10 days of fasting. The initial body weight of the fish was 9.77 ± 2.03 g. Accumulated measures of feed intake (FI) over 11 meals were found to achieve 95% repeatability and a high accuracy of estimation of FI. During the FI measurement period, the average fish growth was 12.0 ± 3.6 g, feed...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00357/46832/46707.pdf
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Quantifying the genetic parameters of feed efficiency in juvenile Nile tilapia Oreochromis niloticus ArchiMer
De Verdal, Hugues; Vandeputte, Marc; Mekkawy, Wagdy; Chatain, Beatrice; Benzie, John A. H..
Background: Improving feed efficiency in fish is crucial at the economic, social and environmental levels with respect to developing a more sustainable aquaculture. The important contribution of genetic improvement to achieve this goal has been hampered by the lack of accurate basic information on the genetic parameters of feed efficiency in fish. We used video assessment of feed intake on individual fish reared in groups to estimate the genetic parameters of six growth traits, feed intake, feed conversion ratio (FCR) and residual feed intake in 40 pedigreed families of the GIFT strain of Nile tilapia, Oreochromis niloticus. Feed intake and growth were measured on juvenile fish (22.4g mean body weight) during 13 consecutive meals, representing 7days of...
Tipo: Text Palavras-chave: Feed conversion ratio; Tilapia; Heritability; Genetic estimations; Correlations.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00469/58115/60551.pdf
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Response to selection for growth in an interspecific hybrid between Oreochromis mossambicus and O. niloticus in two distinct environments ArchiMer
De Verdal, Hugues; Rosario, Westly; Vandeputte, Marc; Muyalde, Nerafe; Morissens, Pierre; Baroiller, Jean-francois; Chevassus, Bernard.
The development of a saline tolerant tilapia strain able to grow fast is of importance in the Philippines, where 240 000 ha of brackish water ponds are available. To this end, founder hybridization between Oreochromis niloticus (with favorable growth traits) and O. mossambicus (with favorable salinity tolerance traits) was performed and followed by backcrossing with O. mossambicus to develop a strain highly tolerant to saline environments. Genetic selection for growth performance was subsequently conducted. The aim of the present study was to estimate growth performance and survival of the hybrid in two rearing environments following four generations of genetic selection. A comparison between the hybrid and an internal reference line was performed in two...
Tipo: Text Palavras-chave: Salinity tolerance; Selection; Hybridization; Genetic gain; Heritability; Survival rate.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00187/29836/28287.pdf
Registros recuperados: 7
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