Rapid visual assessment of spawning activity and associated habitat utilisation of sea lamprey ( Petromyzon marinus Linnaeus, 1758) in a chalk stream: implications for conservation monitoring.

The article focuses on a study conducted for a requirement of conservation monitoring of population and habitat utilization of sea lamprey Petromyzon marinus fishes in chalk streams of Great Britain. Topics include population decline of fishes due to river fragmentation and habitat loss, utilisation of spawning habitats, migration of fish species, observation of water temperature, nest counting in chalk streams and rivers and assessment methodologies for protection of spawning habitats.