Comparison of the performance of six artificial feeds for Dover sole (Solea solea)

This document reports the performance of six artificial diets for Dover sole, which has been assessed in a feeding trial. The feeding trial had two contractors: Nutreco and Solea bv. As a result some of the diets in the experiment will be kept anonymous to each of the contractors. This report has been written for Nutreco. It is concluded that among the Nutreco feeds none of the feeds yields better performance in terms of SGR and FCR than any of the other Nutreco feeds

Betere kwaliteit vis door bedwelmen voor de slacht?

Supermarkten stellen in toenemende mate eisen aan de wijze waarop de productieomstandigheden en het welzijn van gehouden vissen worden afgestemd. In het kader van deze ontwikkeling is het van belang dat gehouden vissen eerst bewusteloos worden gemaakt voordat ze worden gedoo

Test for potential protective effects of Catosal on mortality of fish due to temporary hypoxia

Studies with several fish species have shown that fishes during transport are exposed to different stressful stimuli that may cause adverse physiological reactions, which may lead to mortality. Given the fact that ornamental fish represent a high economical value, reduction of stress in ornamental fish during transport to minimise mortality is essential

Welfare aspects of live chilling and freezing of farmed eel (Anguilla anguilla L.): neurological and behavioural assessment

Firstly, 19 eels with an average live weight of 758±44 g were restrained and equipped with EEG, ECG electrodes and a temperature sensor inside the body. Then, they were placed in the ice water. Indices for the induction of unconsciousness and insensibility were the appearance of theta and delta waves and no response on pain stimuli, which disappeared at a body temperature of 8.0±2.1 °C after 12±5 min in 15 eels. The responses to pain stimuli did not disappear in three eels. Within a confidence level of 95°the percentage of eels that is not effectively stunned during the procedure in ice water of <5 °C was at least 5&Eth;The heart rate decreased from 24±10 beats/min (n=14) to 7±4 (n=11) and became irregular during cooling down. When placed in the brine water of -18 °C, the EEG showed rapid and extreme depolarisation of the membranes, which started after 27±17 s (n=18). The ECG showed fluttering of the heart in all eels. None of the eels recovered after this procedure. For 10 eels with an average live weight of 128±27 g, it was observed that the body temperature decreased from 17.1±0.6 to 4.0±0.5 °C in the ice water. After 15 min in the brine water of -16.1±2.2 °C, the body temperature decreased to -3.1±2.3 °C. Finally, three groups of seven eels and eight single eels were placed in ice water of -0.0±0.1 °C. The observation of unrestrained eels revealed four phases. Animals were (1) swimming around in the water, (2) attempting to escape from the ice water, (3) pressing their nose to the wall or corner while showing clonic muscle cramps, and finally (4) breathing only, while all other muscle activity was totally suppressed. Afterwards, they were transferred to cold brine at -18 °C, and none of the eels recovered. The eight control eels, which were transferred to water at 18 °C, swam around, except for one that was lying in an S-shape position at the bottom. After 570 and 605 s, two eels tried to escape from the box. The obtained results show that the eels, which were transferred from water at 18 °C to ice water, might be stressed, a specific behaviour and an irregular heart rate were observed. From an animal welfare point of view, it is therefore not recommended to stun eels by live chilling. Moreover, at least 5 f the eels will not be stunned at a body temperature of <5 °C. Placing eels in brine water of -18 °C is an effective method to kill the eels before slaughter. However, it cannot be recommended to place conscious eels in cold brine water, because it takes more than 27 s before unconsciousness may be induced