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Title: River Axe Fish Study - Evaluation of Fish Movements in the Estuary
Author: J.S. Alabaster
Document Type: Monograph
Annotation: Report from J.S. Alabaster collection
The option under consideration is the abstraction of up to 25 Ml/d (0.289 nr/s) of surface water from the R. Axe near the tidal limit, leaving an assumed minimum residual flow of 0.625 nr/s which would result in a reduction in freshwater flow to the estuary and the sea and which might affect fish migration through the estuary. Salmon (Salmo salar L.) and seatrout (Salmo trutta L.) are present in the river and traverse the estuary, seawards as smolts, and landwards as returning adult fish and, being the most conmon, are the main species at risk. Eel (Anguilla anguilla L.), sea lamprey (Petromyzon marinus L.) and, rarely, Twaite shad (Alosa fallax Lacep6de) also migrate through the estuary, and flounder (Platichthys flesus L.) and mullet (Mugil sp.) enter tidal waters from the sea; neither these, nor brown trout (Salmo trutta L.), roach (Rutilus rutilus L.) and dace (Leuciscus leuciscus L.), which have been caught near the tidal limit (Champion & Swain, 1974), will be considered further in this report. The nature of the movement of salmonid fish in the estuary has not been observed directly but must be infered from observations elsewhere and from data on catches in the R. Axe by commercial seine netting at the mouth of the estuary, rod fishermen on the river and also the experimental trap operated by the Ministry of Agriculture, Fisheries and Food (MAFF) for several years (1960-1976) near the tidal limit and about 3 km from the sea. The potential impact of the proposed abstraction on fish movements in the estuary will, therefore, be assessed by relating these catches to river flow and other relevant factors
Publisher: Mander, Raikes & Marshall on Water Resource Development in East Devon
Publication Date: 1986
Publication Place: Bristol
Subject Keywords: EstuariesTidal riversFreshwater fishesEstuarine fisheriesMigrationMovementWater abstractionCatchesAnglingFlow rateWater qualityWater levelsNet fishingLine fishingEnvironmental factors
Geographic Keywords: EnglandAxe Estuary
Taxonomic Keywords: Salmo salarSalmo truttaAnguillidaeAnguilla anguillaPetromyzon marinusAlosa fallaxPlatichthys flesusRutilus rutilusLeuciscus leuciscus
Extent: 14
Total file downloads: 155

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