Many fish species depend on migration for various parts of their life cycle. Well‐known
examples include diadromous fish such as salmon and eels that need both fresh water and …

The development of hydropower and other infrastructure that disrupts river connectivity
poses a serious threat to highly endemic and genetically distinct freshwater fish species in …

Habitat fragmentation is a principal threat to biodiversity and artificial river barriers are a
leading cause of the global decline in freshwater biota. Although the impact of barriers on …

Passage of fish through hydropower dams is associated with mortality, delay, increased
energy expenditure and migratory failure for migrating fish and the need for remedial …

Highlights•Salmon smolts encountered velocity gradients (VGs) when light and dark.•A
hierarchy of behaviours that describes magnitude of avoidance was identified.•Avoidance of …

An increasing presence of instream structures such as weirs, dams, culverts and reservoirs
degrades habitats, fragments rivers and blocks fish movements worldwide. Longitudinal …

During their life cycle, fish carry out distinct movements within rivers and migrate upstream
and downstream to reproduce, to feed, and to shelter in refuge habitats. During downstream …

Background Fish migration has severely been impacted by dam construction. Through the
disruption of fish migration routes, freshwater fish communities have seen an incredible …

Simple Summary Environmental pollution and hydropower development have affected fish
survival and caused the extinction of some fish populations and species. To understand the …

Light intensity is an important environmental factor that affects fish growth and health
through multiple physiological activities and metabolism and eventually impacts aquaculture …