Browsing Irish Fisheries Leaflets by Title
Now showing items 178-181 of 181
The Winter Herring Fishery of the North-West of Ireland (1968-69)The 1968/69 winter herring fishery off the Donegal, North Mayo and Sligo coasts began in mid October, 1968 and continued until the end of January, 1969. A total of 63,821 crans were landed during the season as compared with 55,193 crans landed during the 1967/68 season. The majority of the landings mere made at the ports of Killybegs, Sligo and Burtonport. A feature of the season was the increased landings made at Sligo by both local and Killybegs boats.
Winter Nitrate and Phosphate levels in the Western Irish Sea in 1991This study of nitrate, phosphate and salinity levels in the western Irish Sea indicates that the distribution of nutrient levels can be explained by taking into account the known physical and hydrological features of the area. There is a clear inverse relationship between nitrate and salinity data with nitrate levels decreasing rapidly moving offshore. The distribution of phosphate levels is more complex and appears to be influenced by multiple point source inputs and inflows from the Celtic Sea.
Zebra Mussels in IrelandThe zebra mussel was reported for the first time in Ireland during 1997. It may have been introduced during or before, 1994. Information, based on eye-witness accounts from 1995 and the age structure of zebra mussels sampled during October and November 1997, suggests they first became established in the region between southern Lough Derg and Limerick Docks. The species expanded its range during 1996 to include most of Lough Derg and by 1997 had settled in the remaining north-eastern region of the lake. The mussels could have reached Ireland in several ways. The most likely vectors are boats carried on trailers directly from Britain, and one recently imported barge carrying live mussels was found. There may have been a number of introductions. It is possible that some arrived in ballast water from shipping in Limerick Docks. Mussels foul a wide range of structures and easily settle on firm surfaces, including water supply pipes. For this reason their presence is of serious concern to amenity and industry. In the Shannon they have formed dense concentrations on the dock gates in Limerick and the sluice gates and pillars of the Parteen and Ardnacrusha dams. Piped water to a hatchery was blocked with a subsequent loss of fish. Densities on the hulls of vessels were up to 53,000 per sq.m. They were most frequently found attached to the hulls of barges and private craft not slipped annually. Few hire cruisers were fouled. Some mooring have sunk under the weight of attached mussels. Fresh-water mussels Anodonta anatina, rocks, stones and some aquatic plants were found with attached zebra mussels. It is likely there will be changes to the ecosystem. The overall effects cannot be predicted and will require careful monitoring. It is inevitable that mussels will spread throughout the navigable waterways of the Shannon and Erne and to the Barrow via the Grand Canal. The spread to other waterbodies can be curtailed if boats are cleaned before being transported. Because mussels can survive up to three weeks under damp and dull conditions special care is necessary to ensure that transfers are avoided. Leaflets have been distributed to boat owners and anglers to advise on precautionary measures.
The Zoogeography of Some Fishes in Irish WatersSome thirty years ago the then Fisheries Branch of the Department of Agriculture decided to give rewards for specimens of rare or interesting species of fish sent for examination. This, coupled with the enlightened attitude of Irish fishermen to their catches in recent years, has provided valuable information about the rarer species of fishes found in Irish waters. Even so information is still lacking on many species because normal fishing methods are not really geared to their capture. This is so with many of the smaller members of the fish fauna, and, particularly, those which live in rocky areas where normal fishing is not practised. The advent of skin-diving, however, is likely to improve knowledge of many such species, so that in the near future it may be necessary to revise drastically current views as to the abundance and distribution of many such species of fishes known to frequent Irish waters.