Fish welfare: Current issues in aquaculture

Ashley, Paul J.

doi:10.1016/j.applanim.2006.09.001

Cited by 842 publications

(681 citation statements)

References 222 publications

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“…A change in responses to the CS+ or CS-may indicate a change in memory, motivation, arousal, or impulsivity, rather than changes in judgements about ambiguity. Additional indicators of arousal may include glucocorticoid levels and locomotion (fish: Ashley, 2007; reptiles: Silvestre, 2014).…”

Section: How To Design a Judgement Bias Study: A Step-by-step Guide Amentioning

confidence: 99%

A “How-To” Guide for Designing Judgment Bias Studies to Assess Captive Animal Welfare

Bethell

2015

Journal of Applied Animal Welfare Science

114

130

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Section: How To Design a Judgement Bias Study: A Step-by-step Guide Amentioning

confidence: 99%

A “How-To” Guide for Designing Judgment Bias Studies to Assess Captive Animal Welfare

Bethell

2015

Journal of Applied Animal Welfare Science

114

130

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“…In fact, as seen in a previous work with these same fish (Gatica et al 2008), a low muscle pH and an increased rate of onset of rigor mortis was seen as transport proceeded and specially after the pumping, but some recovery was seen after resting in cages. When moving fish, the use of fish pumps and transfer pipes appears to be preferable in terms of welfare and they should be as short as possible (Ashley 2007). According to Benson (2004) 3 , any delay over a maximum of 2 minutes can have an adverse effect and increase stress levels.…”

Section: Discussionmentioning

confidence: 99%

“…Harvest also entails a fasting period of one to three days, depending on the water temperature (Wall 2001). From a welfare point of view, fasting should be as short as possible (Ashley 2007, Stevenson 2007. Acute disturbances produced during harvest cause proportional physiological changes and these can be useful indicators of the degree of stress experienced by the fish (Barton 2000).…”

Section: Effects Of Commercial Live Transportation and Preslaughter Hmentioning

confidence: 99%

Effects of commercial live transportation and preslaughter handling of Atlantic salmon on blood constituents

et al. 2010

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RESUMENSe evaluaron los efectos de la cosecha con transporte en wellboat y el manejo ante mortem sobre los constituyentes sanguíneos relacionados al estrés en salmones (Salmo salar). Diez peces fueron muestreados en cada una de las seis etapas denominadas: centro; después de la carga; después del transporte; después de la descarga; después del reposo y después del bombeo hacia la planta procesadora. Se determinaron las concentraciones sanguíneas de cortisol, glucosa, lactato, sodio, cloruro y osmolalidad. En cada etapa, las concentraciones de los constituyentes sanguíneos analizados cambiaron de acuerdo con la severidad del tratamiento aplicado. Los resultados de este estudio indican que una de las etapas más estresantes fue el bombeo desde las jaulas de reposo hacia la planta de proceso. La concentración de todas las variables estudiadas disminuyó después de 24 horas en las jaulas de reposo, y todas, a excepción de la glucosa, aumentaron después de que los peces fueran bombeados a través del salmoducto desde las jaulas de reposo a la planta de proceso. Esto confirma que este último manejo es la etapa más estresante de las estudiadas durante este transporte comercial.

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“…Fish in aquaculture farms are often subjected to acute or chronic stressors such as handling, transportation, sorting, temperature change, high rearing density and poor water quality. These factors affect fish physiology and their growth, behavior, welfare and reproduction, which cause high mortality and severe economic losses (ASHLEY, 2007;BRINN et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Ectocommensal and ectoparasites in goldfish Carassius auratus (Linnaeus, 1758) in farmed in the State of São Paulo

Moysés

Spadacci-Morena

Xavier

et al. 2015

Rev. Bras. Parasitol. Vet.

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Concomitant infections by several parasitic genera are rare, very debilitating and often lethal to fish reared under commercial breeding conditions. Were describe a multiple and concurrent parasite infestation in cultured goldfish Carassius auratus with skin damage (nodules and/or ulceration). Fish with skin lesions underwent necropsy, and the skin and gills were scraped and examined. Histopathological examination with Hematoxylin-Eosin and Giemsa stain, and an ultrastructure study using transmission and scanning electron microscopy were conducted. In the skin, we identified multiple-parasite infestations by Gyrodactylidae, Epistylis sp., Trichodina sp., Ichthyophthirius multifiliis, Tetrahymena sp. and Ichthyobodo necator, associated with epithelial cell hyperplasia and epidermal sloughing. Although no gross lesions were observed, were identified a large number of parasites in the gills (Epistylis sp., Piscinoodinium sp., Ichthyophthirius multifiliis, Trichodina sp., Apiosoma sp., Hexamita sp. and cysts of a trematode digenean). The observed trematodes were not identified. The associated microscopic lesions were epithelial hypertrophic and hyperplasic and exhibited fusion of secondary lamellae and epithelial cell detachment. This is the first description of a protozoan Vorticella sp. parasitizing goldfish in Brazil. Multiple ectoparasitism by protozoa and Platyhelminthes, with or without apparent tissue damage, can be fatal for goldfish raised on farms with poor management.Keywords: Carassius auratus, digenean trematodes, fish diseases, infection protozoan, parasites. ResumoA infestação concomitante por vários gêneros de parasitas é uma condição rara, debilitante e letal para os peixes e está geralmente associada aos problemas ambientais e de manejo. Com o objetivo de descrever os ectoparasitos presentes em kinguios Carassius auratus com lesões cutâneas, cultivados em fazenda comercial, foram analisados 30 exemplares de peixes por esfregaços de pele lesionada e de brânquias; exame histopatológico de tecidos corados pela técnica de Hematoxilina-Eosina e Giemsa e estudo ultraestrutural por microscopia eletrônica de transmissão e varredura de tecidos coletados após necropsia. Nas lesões cutâneas, foram observados os parasitos: Gyrodactylidae, Epistylis sp., Trichodina sp., Ichthyophthirius multifiliis, Tetrahymena sp. e Ichthyobodo necator, associados à hiperplasia epitelial, descamação epidérmica e presença de infiltrado inflamatório. A infestação das brânquias, mesmo sem lesão macroscópica, evidenciou Epistylis sp., Piscinoodinium sp., I. multifiliis, Trichodina sp., Apiosoma sp., Hexamita sp. e cistos de trematódeo associados à hipertrofia e hiperplasia epitelial, fusão de lamelas secundárias, descamação epitelial e presença de infiltrado inflamatório. Os trematódeos observados não foram identificados. É a primeira descrição do protozoário Vorticella sp. parasitando kinguios no Brasil. O ectoparasitismo múltiplo por protozoários e platelmintos, com ou sem lesão aparente, pode ser fatal em peixes cultiva...

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Fish welfare: Current issues in aquaculture

Cited by 842 publications

References 222 publications

A “How-To” Guide for Designing Judgment Bias Studies to Assess Captive Animal Welfare

A “How-To” Guide for Designing Judgment Bias Studies to Assess Captive Animal Welfare

Effects of commercial live transportation and preslaughter handling of Atlantic salmon on blood constituents

Ectocommensal and ectoparasites in goldfish Carassius auratus (Linnaeus, 1758) in farmed in the State of São Paulo

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