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Transitional Waters

Fish Stock Survey of Glasshouse Lake, September 2022

Glasshouse Lake is located approximately 7km northeast of Carrigallen in Co. Cavan (Figure 1.1). The area of the lake is 54 hectares, mean depth is <4m and maximum depth is 13m. It is located within the Erne Catchment, proximal to, but separate from the Lough Oughter lake complex to which it is linked via the Cullies River which enters and exits the lake at the western portion of the lake. The lake is categorised as typology class 8 (as designated by the EPA for the Water Framework Directive), i.e. deep (>4m), greater than 50ha and moderately alkaline (20-100mg/l CaCO3).

The lake is largely reed fringed with the exception of the roadside shoreline and small sections of the eastern and western shores. The roadside shoreline is generally shallow, but areas of deeper water occur off the eastern and western shores. The lake is reported to contain reasonable stocks of small to medium sized pike, but larger fish are known to be present. There is shore fishing for bream (Abramis brama), roach (Rutilus rutilus), roach x bream hybrids (Abramis brama x Rutilus rutilus), perch (Perca fluviatilis), pike (Esox lucius) and some tench (Tinca tinca) and there is good access via a lakeside road to shore fishing from a “Coillte” forest (IFI, 2017).

The lake was previously surveyed in 1969 (Inland Fisheries Trust, unpublished). At that time, bream, perch, pike, rudd (Scardinius erythrophthalmus) and rainbow trout (Oncorhynchus mykiss) were recorded. Several roach and roach x bream hybrids were also captured at that time, which represent early records for roach and their hybrids in Irish lakes. Glasshouse lake was last surveyed by Inland Fisheries Ireland in 2017. Perch and roach were the most abundant species recorded in the lake (McLoone et al., 2017).

This report summarises the results of the 2022 fish stock survey carried out on the lake using Inland Fisheries Ireland’s (IFI) fish in lakes monitoring protocol. The protocol is WFD compliant and provides insight into fish stock status in the lake.

Topics: Lake Surveys 2022 , |