Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1229
Título: Preferences for the presence of substrate in male cichlid fish: Effects of social dominance and context
Autor: Galhardo, Leonor
Almeida, Olinda
Oliveira, Rui Filipe
Palavras-chave: Preferences
Choice tests
Substrate
Tilapia
Fish welfare
Data: 2009
Editora: Elsevier
Citação: Applied Animal Behaviour Science, 120, 224-230
Resumo: Many cichlid species dig spawning pits or nests in soft bottoms and exhibitmany substrate oriented activities. Despite this fact being of general knowledge, captive cichlids in laboratory and aquaculture set-ups are often kept in the absence of a soft substrate that they can manipulate. This raises a potential welfare issue, depending on how the substrate is valued by cichlid fish. The aim of this study is to assess the importance of substrate for male Mozambique tilapia (Oreochromis mossambicus) in social and non-social contexts. Preferences were established as a measure of time spent in two choice compartments, before and after the presence of a female. Locomotory activity, social interactions and substrate-related behaviours were recorded. Results show that dominant males prefer the area with substrate regardless of social context, and that female’s presence strengthens this preference. The same preference is not apparent in the subordinate males, except for foraging. To draw conclusions on the importance of substrate to subordinates, preferences should also be assessed in agonistic contexts, during which substrate may serve to displace aggression. These results, together with related previous studies, show that the lack of substrate is particularly deleterious in a reproductive context, and thus it is likely to decrease the welfare state of breeding males of Mozambique tilapia.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1229
ISSN: 0168-1591
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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