Large‐scale anthropogenic river modifications have caused the loss of critical floodplain nursery habitats for riverine fish, leading to population declines. Restoration efforts have been implemented to recover these habitats, but with varying success. Understanding how larval and juvenile fish use habitats in dynamic river environments is essential for improving restoration strategies. We assessed ontogenetic shifts in habita...

White spot syndrome virus (WSSV), the etiological agent of white spot disease (WSD), is a significant pathogen affecting shrimp farming industry worldwide. White spot syndrome virus is a generalist virus mainly infecting decapod crustaceans. The aims of this review were to: (1) Re‐evaluate and update the status of reported WSSV host and vector species based on the methods used when detecting replication and transmission to shr...

The large‐scale degradation of riparian ecotones and of the connectivity between rivers and their floodplains has resulted in a drastic decline of rheophilic fish populations in European temperate lowland rivers. Recent river restoration projects have had variable success in effectively restoring these fish populations. Knowledge on nursery habitat requirements is considered essential for effective population restoration. Howe...

Dendronereis spp. (Peters) (Nereididae) is a common polychaete in shrimp ponds built on intertidal land and is natural food for shrimp in traditionally managed ponds in Indonesia. White spot syndrome virus ( WSSV ), an important viral pathogen of the shrimp, can replicate in this polychaete (Desrina et al . 2013); therefore, it is a potential propagative vector for virus transmission. The major aim of this study was to determi...

The objective of this study was to assess whether and how coping strategies affect the welfare of African catfish Clarias gariepinus housed at low and high densities. Group composition influenced feed intake; re‐active groups (comprised of 100% re‐active fish) had a lower specific growth rate ( G ) and feed intake and a higher feed conversion ratio ( R FC ) than pro‐active groups. Furthermore, re‐active groups had a lower ener...

Soybean meal (SBM) induces enteritis in the distal intestine of Atlantic salmon. The present study assesses the effects of SBM concentrations on the kinetics of the enteritis process. Fish of 300 g, kept at 12 °C, were fed diets with different SBM inclusions: 0%, 10% and 20% SBM for 57 days. Samples of the distal intestine of five fish per treatment were taken for histological and electron microscopical analysis. A semi‐quanti...

Soybean meal‐induced enteritis was characterized by the disappearance of the supranuclear vacuoles (SNV) in the enterocytes of the distal intestine of Atlantic salmon Salmo salar . The loss of SNV was correlated with an endocytosis uptake block as shown with ferritin as a marker molecule.

This study shows that in African catfish Clarias gariepinus feed intake ( I F ) is stimulated by the presence of conspecifics resulting in higher I F and growth rate. The feeding duration and the frequency of feeding acts were lower in isolated fish as compared with non‐isolated fish, indicating a decreased feeding motivation when fish are held individually. Isolation per se , however, seems not to act as a stressor in the sho...

Short periods of light or no light (18D : 06L and 24D : 00L) resulted in an increased growth compared to extended periods of light (06D : 18L and 12D : 12L) in African catfish Clarias gariepinus . Fish under longer periods of light (12D : 12L and 18D : 06L) showed higher swimming activity, more aggression (injuries on the body) and higher lactate, free fatty acids and cortisol levels compared to those who were reared at shorte...