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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Seasonality and heterogeneity of live fish movements in Scottish fish farms
Author(s): Werkman, Marleen
Green, Darren
Munro, Lorna Ann
Murray, Alexander G
Turnbull, James
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Keywords: Disease transmission
Contact structure
Atlantic salmon Diseases
Atlantic salmon Ecology
Issue Date: 2011
Date Deposited: 20-Mar-2012
Citation: Werkman M, Green D, Munro LA, Murray AG & Turnbull J (2011) Seasonality and heterogeneity of live fish movements in Scottish fish farms. Diseases of Aquatic Organisms, 96 (1), pp. 69-82.
Abstract: Movement of live animals is a key contributor to disease spread. Farmed Atlantic salmon Salmo salar, rainbow trout Onchorynchus mykiss and brown/sea trout Salmo trutta are initially raised in freshwater (FW) farms; all the salmon and some of the trout are subsequently moved to seawater (SW) farms. Frequently, fish are moved between farms during their FW stage and sometimes during their SW stage. Seasonality and differences in contact patterns across production phases have been shown to influence the course of an epidemic in livestock; however, these parameters have not been included in previous network models studying disease transmission in salmonids. In Scotland, farmers are required to register fish movements onto and off their farms; these records were used in the present study to investigate seasonality and heterogeneity of movements for each production phase separately for farmed salmon, rainbow trout and brown/sea trout. Salmon FW-FW and FW-SW movements showed a higher degree of heterogeneity in number of contacts and different seasonal patterns compared with SW-SW movements. FW-FW movements peaked from May to July and FW-SW movements peaked from March to April and from October to November. Salmon SW-SW movements occurred more consistently over the year and showed fewer connections and number of repeated connections between farms. Therefore, the salmon SW-SW network might be treated as homogeneous regarding the number of connections between farms and without seasonality. However, seasonality and production phase should be included in simulation models concerning FW-FW and FW-SW movements specifically. The number of rainbow trout FW-FW and brown/sea trout FW- FW movements were different from random. However, movements from other production phases were too low to discern a seasonal pattern or differences in contact pattern.
DOI Link: 10.3354/dao02382
Rights: Published in Diseases of Aquatic Organisms. Copyright © 2011 Inter-Research.

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