8 documents found, page 1 of 1
The effect of tank cover on welfare of farmed Nile tilapia
Saraiva, João L.; Nogueirinha, Margarida; Teodósio, Rita; Aragão, Cláudia; Engrola, Sofia; Arechavala Lopez, PabloWelfare in aquaculture is a pressing topic. One of the main measures to improve the life of farmed fish is implementing environmental enrichment, which can include the addition of structural covers to rearing tanks. Here we test the effects of tank covers (fully covered, 50 % covered and uncovered) in an all-male population (N = 75 tagged individuals: 5 individuals per tank, 5 tanks per treatment) of farmed Nil...
Effects of structural environmental enrichment on welfare of juvenile seabream ...
Arechavala Lopez, Pablo; Diaz-Gil, C.; Saraiva, João L.; Moranta, D.; Castanheira, Maria Filipa; Nuñez-Velázquez, S.; Ledesma-Corvi, S.; Mora-Ruiz, M.R.Current production systems of finfish aquaculture, and in particular intensive farming systems, can cause welfare problems leading not only to poor condition of the fish but also to a decrease in product quality. Adding structural environmental enrichment (EE) to bare rearing environments may improve the welfare of certain cultured fish. In this study we experimentally demonstrate the positive effects of adding...
Welfare of fish—no longer the elephant in the room
Saraiva, João L.; Arechavala Lopez, PabloThe concept of fish welfare is fairly recent and was overlooked for many years, based on a popular misconception that fish were “stupid” creatures devoid of any kind of sentience or mental capability [...] (excerto da primeira página).
Taxonomic re-evaluation of the non-native cichlid in Portuguese drainages
Carecho, João; Baduy, F.; Silva, FBV; Guerreiro, Pedro; Saraiva, João L.; Ribeiro, Filipe; Veríssimo, AnaA non-native cichlid fish firstly reported in Portugal in 1940 was originally identified as Cichlasoma facetum (Jenyns 1842) based on specimens reported from “Praia de Mira” (Vouga drainage, northwestern Portugal). Currently, the species is known only from three southern Portuguese river drainages, namely Sado, Arade and Guadiana, and no other record has been made from Praia de Mira or the Vouga drainage since ...
A multi-component pheromone in the urine of dominant male tilapia (Oreochromis ...
Keller-Costa, Tina; Saraiva, João L.; Hubbard, Peter C.; Barata, Eduardo N.; Canário, Adelino V. M.Males often use scent to communicate their domi- nance, and to mediate aggressive and breeding behaviors. In teleost fish, however, the chemical composition of male pher- omones is poorly understood. Male Mozambique tilapia, Oreochromis mossambicus, use urine that signals social status and primes females to spawn. The urinary sex pheromone di- rected at females consists of 5β-pregnane-3α,17α,20β-triol 3- glucur...
A multi-component pheromone in the urine of dominant male tilapia (Oreochromis ...
Keller-Costa, Tina; Saraiva, João L.; Hubbard, Peter; Barata, Eduardo Nuno; Canário, Adelino V. M.Males often use scent to communicate their dominance, and to mediate aggressive and breeding behaviors. In teleost fish, however, the chemical composition of male pheromones is poorly understood. Male Mozambique tilapia, Oreochromis mossambicus, use urine that signals social status and primes females to spawn. The urinary sex pheromone directed at females consists of 5 beta-pregnane-3 alpha,17 alpha,20 beta-tri...
Environmental modulation of androgen levels and secondary sex characters in two...
Saraiva, João L.; Gonçalves, David M.; Oliveira, Rui F.Morphology and endocrinology were studied in two populations of the peacock blenny Salaria pavo, with different regimes of sexual selection imposed by differences in nest site availability. The peacock blenny is a small, sexually dimorphic benthic fish that presents exclusive paternal care of the clutch and inhabits rocky shores of the Mediterranean and adjacent Atlantic areas. In a population from the Gulf of ...
The effect of nest aggregation on the reproductive behaviour of the peacock ble...
Barata, Eduardo N.; Saraiva, João L.; Canário, Adelino V.M.; Oliveira, Rui F.The effect of nest aggregation in courtship behaviour was tested experimentally in an ecologically constrained, sex-role reversed population of the peacock blenny Salaria pavo. Mixed sex groups of eight males and eight females were tested in experimental tanks, containing eight potential nests either aggregated or dispersed. In the aggregated treatment, males spent more time inside their nests and monopolized o...