title: Relationship between European eel Anguilla anguilla infection with non-native parasites and swimming behaviour on encountering accelerating flow.
abstract: The effect of Anguillicola crassus, Pseudodactylogyrus bini and Pseudodactylogyrus anguillae infection on the behaviour of downstream migrating adult European eels Anguilla anguilla as they encountered accelerating water velocity, common at engineered structures where flow is constricted (e.g. weirs and bypass systems), was evaluated in an experimental flume. The probability of reacting to, and rejecting, the velocity gradient was positively related to A. crassus larval, adult and total abundance. High abundance of Pseudodactylogyrus spp. reduced this effect, but A. crassus was the strongest parasitic factor associated with fish behaviour, and abundance was positively related to delay in downstream passage. Delayed downstream migration at hydraulic gradients associated with riverine anthropogenic structures could result in additional energetic expenditure for migrating A. anguilla already challenged by A. crassus infection.
authors: The International Centre for Ecohydraulics Research, Faculty of Engineering and the Environment, Highfield Campus, University of Southampton, Southampton, Hampshire SO17 1BJ, U.K.
authors: L R
authors: LR
authors: Newbold
authors: F A
authors: FA
authors: Hockley
authors: C F
authors: CF
authors: Williams
authors: J
authors: J
authors: Cable
authors: A J
authors: AJ
authors: Reading
authors: N
authors: N
authors: Auchterlonie
authors: P S
authors: PS
authors: Kemp
mesh_terms: D000811:Anguilla / Q000469:parasitology* / Q000502:physiology*; D025041:Animal Migration; D000818:Animals; D001522:Behavior, Animal; D017176:Dracunculoidea; D005393:Fish Diseases / Q000469:parasitology*; D007814:Larva; D013550:Swimming; D014200:Trematoda
keywords: Anguillicola crassus; Anguilliformes; Pseudodactylogyrus anguillae; Pseudodactylogyrus bini; barriers; migration