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Publication
Behavioural differences in Mozambique tilapia (Oreochromis mossambicus)
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Abstract(s)
As diferenças comportamentais sempre foram visualmente observadas em animais de diversas espécies e, nas últimas décadas, deu-se início a uma série de estudos que pudessem aprofundar este conhecimento.
Pelas suas características e pela sua importância comercial, a tilápia de Moçambique também tem sido alvo de estudo e as suas diferenças comportamentais têm-se mostrado relevantes e fáceis de observar. Esta tese propôs-se verificar a existência das diferenças comportamentais entre os indivíduos observados e se estas diferenças seriam consistentes ao longo de vários contextos e correlacionáveis entre si. Seis testes deram lugar a um conjunto de resultados que divulgaram padrões comportamentais de agressão, atividade, exploração e reatividade. Estes três últimos padrões revelaram uma correlação positiva entre si, mas negativa com o padrão de agressividade. Estas correlações podem ser expressivas de diversas adaptações ao meio ambiente circundante. Os três grupos de animais observados mostraram diferenças de comportamento significativas que podem ser explicadas pela diferença de idades e experiência prévia.
ABSTRACT: Behavioural differences have always been visually observed in many species and, in the last few decades, a series of studies was initiated to better our knowledge on the subject. Due to its characteristics and its commercial importance, the Mozambique tilapia has also been the subject of study and their behavioural differences have been shown to be relevant and easy to observe. This thesis set out to verify the existence of behavioural differences between the observed individuals and if these differences would be consistent over different contexts and correlated with each other. Six tests were carried out and gave place to a set of results that revealed behavioural patterns of aggressiveness, activity, exploration and reactivity. These last three patterns disclosed a positive correlation among them but a negative one with the aggressiveness pattern. Such correlation may express diverse adaptations to the surrounding environment. The three groups of observed animals showed significant behavioral differences that might be explained by age differences and previous experience.
ABSTRACT: Behavioural differences have always been visually observed in many species and, in the last few decades, a series of studies was initiated to better our knowledge on the subject. Due to its characteristics and its commercial importance, the Mozambique tilapia has also been the subject of study and their behavioural differences have been shown to be relevant and easy to observe. This thesis set out to verify the existence of behavioural differences between the observed individuals and if these differences would be consistent over different contexts and correlated with each other. Six tests were carried out and gave place to a set of results that revealed behavioural patterns of aggressiveness, activity, exploration and reactivity. These last three patterns disclosed a positive correlation among them but a negative one with the aggressiveness pattern. Such correlation may express diverse adaptations to the surrounding environment. The three groups of observed animals showed significant behavioral differences that might be explained by age differences and previous experience.
Description
Dissertação de Mestrado apresentada ao ISPA - Instituto Universitário
Keywords
Diferenças comportamentais Tipos comportamentais Tilápias de Moçambique Behavioural differences Behavioural types Mozambique tilapias