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The impact of riverine iron on eels in the Hanö bay

Börjesson, Lina LU (2013) MVEM12 20132
Studies in Environmental Science
Abstract
Since 2009, fish have been reported to avoid the coastline of Hanö bay and appear to be in a poor condition. Observations of a browner water led to the assumption that river water may affect the water quality in the coastal zone. Organic matter and iron are known to affect water color and are both found in high concentrations in the main river draining into the bay. In this study I explore available monitoring data, to understand if river borne iron and organic matter may be factors explaining decreasing fish landings in the Hanö bay area. In an experiment I mixed riverine water with saline water and studied potential effects of iron aggregation on the gills of eels. The result suggests that iron rich river water can affect the respiratory... (More)
Since 2009, fish have been reported to avoid the coastline of Hanö bay and appear to be in a poor condition. Observations of a browner water led to the assumption that river water may affect the water quality in the coastal zone. Organic matter and iron are known to affect water color and are both found in high concentrations in the main river draining into the bay. In this study I explore available monitoring data, to understand if river borne iron and organic matter may be factors explaining decreasing fish landings in the Hanö bay area. In an experiment I mixed riverine water with saline water and studied potential effects of iron aggregation on the gills of eels. The result suggests that iron rich river water can affect the respiratory function of the eel under saline conditions. Further, data on wind direction and water chemistry indicate that river water may accumulate along the coast during prevailing easterly winds. A decline in eel catches has been reported along the western parts of the bay but not along the eastern. Thus, the decline in eel catches may be related to the conditions along the coastline where the main river drains into the bay. Easterly winds may also affect the contribution of nutrients through upwelling, which is common with southwesterly winds. (Less)
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author
Börjesson, Lina LU
supervisor
organization
course
MVEM12 20132
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Hanö bay, Hanöbukten, Iron, Järn, Eel, Ål
language
English
id
4193292
date added to LUP
2014-03-07 13:36:10
date last changed
2014-03-07 13:36:10
@misc{4193292,
  abstract     = {Since 2009, fish have been reported to avoid the coastline of Hanö bay and appear to be in a poor condition. Observations of a browner water led to the assumption that river water may affect the water quality in the coastal zone. Organic matter and iron are known to affect water color and are both found in high concentrations in the main river draining into the bay. In this study I explore available monitoring data, to understand if river borne iron and organic matter may be factors explaining decreasing fish landings in the Hanö bay area. In an experiment I mixed riverine water with saline water and studied potential effects of iron aggregation on the gills of eels. The result suggests that iron rich river water can affect the respiratory function of the eel under saline conditions. Further, data on wind direction and water chemistry indicate that river water may accumulate along the coast during prevailing easterly winds. A decline in eel catches has been reported along the western parts of the bay but not along the eastern. Thus, the decline in eel catches may be related to the conditions along the coastline where the main river drains into the bay. Easterly winds may also affect the contribution of nutrients through upwelling, which is common with southwesterly winds.},
  author       = {Börjesson, Lina},
  keyword      = {Hanö bay,Hanöbukten,Iron,Järn,Eel,Ål},
  language     = {eng},
  note         = {Student Paper},
  title        = {The impact of riverine iron on eels in the Hanö bay},
  year         = {2013},
}