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A Report on a Scientific Survey of Adult Fish Stocks in Lough Ree

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A Report on a Scientific Survey of Adult Fish Stocks in Lough Ree

Lough Ree Fish Stock Survey Summary Findings

Almost 52% of all fish recorded during the L. Ree fish stock survey were roach, 20.7% were roach/bream hybrids, 15.9% were perch with significantly smaller numbers of bream, pike, trout, rudd and pollan making up the balance

The 2014 L. Ree adult fish stock assessment indicates the presence of a healthy brown trout population in this fishery at the time of the survey

Brown trout are widely distributed throughout the lake

The CPUE value calculated for the pike stock of 1.41 can be regarded as high when one sees that the population is a large, balanced and uncropped stock.

The distribution pattern of pike from L. Ree, as recorded from the Spring sampling programme 2014 shows that pike are widespread throughout the lake

A perch CPUE value of 6.44 was calculated for L. Ree in 2014. This can be regarded as reflecting the presence of a large stock of perch by Irish standards

The perch samples recorded during the L. Ree 2014 survey indicate the species was widely distributed throughout the lake

The roach CPUE value calculated for L. Ree in 2014 was 21.04. This is a relatively high figure when compared to CPUE values calculated for other lakes in recent years. This value suggests that L. Ree may still be regarded as a culturally eutrophic lake – roach thrive in culturally eutrophic conditions.

A comparison of CPUE values for bream from a number of other Spring sampled Irish lakes suggests the L. Ree CPUE value is high

The distribution pattern of the L. Ree bream show the species are not widespread and appear to have a preference for the mid section of the lake 

A total of 103 rudd were recorded during the L. Ree 2014 survey. The CPUE value for rudd in L. Ree 2014 was 0.52.

 The rudd population of L. Ree showed a very restricted distribution pattern

Hybrids recorded in L. Ree during the 2014 survey were dominated by roach x bream hybrids

A roach x bream CPUE value of 8.39 was recorded for L. Ree, 2014. This is an exceptionally high value.

Roach x Bream hybrids have a fairly widespread distribution throughout the lake.

A relatively small number of pollan were captured in the course of the 2014 L. Ree survey

The distribution pattern of the pollan recorded as part of the L. Ree Spring 2014 survey clearly shows the restricted distribution of this species. Pollan were located within the deeper areas of the lake,

Currently L. Ree can be regarded as one of Ireland’s premier “mixed fisheries”. Mixed, in this instance, is a reference to three different fish stocks – cyprinid stocks and both the pike and trout populations. The status of all of these populations is such that, presently, each of them can provide quality angling on a seasonal basis.