Completed

As part of the data collection framework, the Marine Institute conducts ten annual fisheries research surveys at sea to provide fisheries independent data for stock assessment. These surveys can be used as platforms of opportunities for the collection of additional ecosystem data to support the reporting requirements for environmental legislation including MSFD, Natura and MSP.

This project was designed to measure the effectiveness of management or mitigation measures taken as part of aquaculture licencing decisions to reduce or minimise risk to conservation features. Such measures are likely to be of the form of, 1) licence conditions that place certain constraints on activities in certain areas or, 2) redrawing site boundaries. The response of the conservation features to such measures will have to be considered.

The key importance of Tralee Bay (but also Clew and Galway) for endangered skates (and the skate-like angel shark) is well known and confirmed thanks to the first two years of EMFF work under the Biodiversity Scheme, and following on from Purse Search, IFI, ICES advice and the recent Irish Red List report. The threats to these species in the area are largely due to tangle netting for crawfish. The species in question are the white skate, common skates, undulate ray, common stingray and the angel shark.

Crayfish stocks are heavily depleted in Irish waters. This depletion has been driven by over exploitation since the introduction of tangle netting in the 1970s. The restoration potential relies on acquiring better data on crayfish essential habitat, information on migration and stock structure and in managing fishing interactions.

Many of the stocks which are caught by the Irish commercial fishing fleets are considered to be data-limited or are not assessed at all. These include a number of key stone species (like sprat, gurnards, saithe, pollack, ling) and species sensitive to the impacts of fishing (like rays and skates, john dory, brill and turbot). For these stocks, the fishing mortality is unknown and MSY reference points are not established. This lack of quantifiable targets is an impediment to the implementation of the Common Fisheries Policy (CFP) as well as the Marine Strategy Framework Directive (MSFD).

Several studies have indicated large accumulations of plastic microfibers in the gut of Dublin Bay prawns Nephrops norvegicus and in the sediments in which they live. The complicated gut system in this species is suggested to retain plastic fibers and places these stocks at potentially high risk of interference from marine microplastic pollution. Fibers which are too large or numerous to pass through the gut can form balls of aggregated material over time.

The native European flat oyster is depleted throughout its former European range. Ireland still has a number of extant populations some of which are commercially fished but production and productivity is much reduced compared to historic levels. Oysters, in addition to being commercially valuable and a significant potential source of income for coastal fishing communities, provide valuable ecosystem services such as carbon sequestration, maintenance of water quality and provision of structural habitat that may support high biodiversity.

Through awareness of information collected on Marine Biodiversity this project will enable engagement with stakeholders with an interest in Ireland’s marine resource.