Regional maps on aquaculture litter

Get an overview of the available knowledge on marine litter originating from the aquaculture sector.

The following maps are a result of the collection of results from these three different databases (OSPAR, HELCOM and Marine LitterWatch) where the information was recalculated per category to average number of collected items per 100 meter beach, and was later transformed into its visualization on three regional maps representing the North Sea, Baltic Sea and the Mediterranean Sea basins. 

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Greater North Sea.

 

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Baltic Sea.

 

In order to interpret the map above correctly, it should be noted that for Estonia and Poland no data was available on the length of the monitored transect (presumably 100 m) and that surveys were probably carried out between 2011-2018 but no exact dates were registered. In addition, the data for Estonia, Finland, Germany and Sweden was collected using a different coding method. As a consequence, only the category ‘mussel and oyster nets’ for Estonia, Finland and Sweden, and the category ‘plastic sheeting from mussel culture’ for Germany were included in the above map.

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Mediterranean Sea.

 

In addition to the marine litter inventory, all collected literature (2009 - January 2019) was screened for potential reference to quantities of mariculture related litter recovered on beaches, on the seabed or at the sea surface. This information was gathered in combination with the location, litter source, observation period, type of quantification and the item itself. When possible, coordinates of the locations were listed and used to create an overall map of the North Sea, Baltic Sea and Mediterranean Sea.

The unit of the reported quantities are very divergent and can range from items/100m or m² to kg or tonnes/annum. To obtain some consistency in these data, the proportion of aquaculture related litter in relation to the total amount of recovered litter was extracted or calculated from the published data. Hence, the results of most published articles can be compared and visualised geographically (maps below).

The collected data points are mainly located in the Mediterranean Sea, in particular the Adriatic and Ionian Sea. Although the data points are primarily derived from seabed surveys, most publications were based on beach litter monitoring events.


 
The monitored beaches in the North, Baltic and Mediterranean Sea and their reported percentage of aquaculture related litter. 

 

On the map above, the locations of the beach litter monitoring events are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. In some studies, only absolute, and no relative quantities were reported. The latter is indicated on this map in dark grey. The results which can only be linked to aquaculture are illustrated with a square, while more general results (aquaculture/fisheries-related items) are represented by a circle. 


The observational transects in the North, Baltic and the Mediterranean Sea and their reported percentage of aquaculture related litter.

 

On the map above, the positions of the observational transects for floating litter are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. The polygon located partially in the Ligurian Sea and the Gulf of Lion represents a series of transects which were monitored during multiple visual surveys by the same research group.

 

The locations of the seabed surveys in the North, Baltic and Mediterranean Sea and their reported percentage of aquaculture related litter.

 

On the map above, the positions of the bottom trawls and diving campaigns are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. The results which can only be linked to aquaculture are illustrated with a square, while more general results (aquaculture/fisheries related items) are represented by a circle. 
 


For seeing the full report please go to our Deliverables section and download D2.2 Knowledge wave on marine litter from aquaculture sources.

Regional maps on aquaculture litter

The following maps are a result of the collection of results from these three different databases (OSPAR, HELCOM and Marine LitterWatch) where the information was recalculated per category to average number of collected items per 100 meter beach, and was later transformed into its visualization on three regional maps representing the North Sea, Baltic Sea and the Mediterranean Sea basins. 

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Greater North Sea.

 

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Baltic Sea.

 

In order to interpret the map above correctly, it should be noted that for Estonia and Poland no data was available on the length of the monitored transect (presumably 100 m) and that surveys were probably carried out between 2011-2018 but no exact dates were registered. In addition, the data for Estonia, Finland, Germany and Sweden was collected using a different coding method. As a consequence, only the category ‘mussel and oyster nets’ for Estonia, Finland and Sweden, and the category ‘plastic sheeting from mussel culture’ for Germany were included in the above map.

 

Distribution of aquaculture facilities and aquaculture related beach litter in the Mediterranean Sea.

 

In addition to the marine litter inventory, all collected literature (2009 - January 2019) was screened for potential reference to quantities of mariculture related litter recovered on beaches, on the seabed or at the sea surface. This information was gathered in combination with the location, litter source, observation period, type of quantification and the item itself. When possible, coordinates of the locations were listed and used to create an overall map of the North Sea, Baltic Sea and Mediterranean Sea.

The unit of the reported quantities are very divergent and can range from items/100m or m² to kg or tonnes/annum. To obtain some consistency in these data, the proportion of aquaculture related litter in relation to the total amount of recovered litter was extracted or calculated from the published data. Hence, the results of most published articles can be compared and visualised geographically (maps below).

The collected data points are mainly located in the Mediterranean Sea, in particular the Adriatic and Ionian Sea. Although the data points are primarily derived from seabed surveys, most publications were based on beach litter monitoring events.


 
The monitored beaches in the North, Baltic and Mediterranean Sea and their reported percentage of aquaculture related litter. 

 

On the map above, the locations of the beach litter monitoring events are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. In some studies, only absolute, and no relative quantities were reported. The latter is indicated on this map in dark grey. The results which can only be linked to aquaculture are illustrated with a square, while more general results (aquaculture/fisheries-related items) are represented by a circle. 


The observational transects in the North, Baltic and the Mediterranean Sea and their reported percentage of aquaculture related litter.

 

On the map above, the positions of the observational transects for floating litter are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. The polygon located partially in the Ligurian Sea and the Gulf of Lion represents a series of transects which were monitored during multiple visual surveys by the same research group.

 

The locations of the seabed surveys in the North, Baltic and Mediterranean Sea and their reported percentage of aquaculture related litter.

 

On the map above, the positions of the bottom trawls and diving campaigns are plotted in combination with a representation of the amount of aquaculture related litter reported. This is done by a colour scheme which represents the proportion of aquaculture related litter to the total amount of recovered litter. The results which can only be linked to aquaculture are illustrated with a square, while more general results (aquaculture/fisheries related items) are represented by a circle. 
 


For seeing the full report please go to our Deliverables section and download D2.2 Knowledge wave on marine litter from aquaculture sources.