• A life history approach to the assessment of deepwater fisheries in the Northeast Atlantic

      Clarke, Maurice (Food and Agriculture Organization of the United Nations, 2005)
      It has been generally stated that deepwater fishes cannot sustain high levels of exploitation because of their characteristic slow growth, longevity and low reproductive output. However deepwater fish species display a wide variety of life-history strategies, occupying diverse positions along the K-r continuum. Literature sources provided data on age, growth, fecundity, maturity and mortality rates of several deepwater teleosts and elasmobranchs. Many teleosts displayed intermediate or conservative life-history characteristics, but the squalid sharks were more stringent K-strategists. These data were used in life-history analyses to assess the sustainability of these mixed-species deepwater fisheries. Whilst there may be scope for compensatory changes in fecundity such scope is likely to be limited, especially for sharks. The implications of these life-history parameters for sustainable exploitation are discussed by way of comparison with continental shelf species from this region.
    • ‘Linking Herring’: do we really understand plasticity?

      Dickey‐Collas, M; Clarke, M; Slotte, A (Oxford University Press, 2009)
      The symposium was organized to link our understanding of herring biology, population dynamics, and exploitation in the context of ecosystem complexity. It is beyond argument that herring play a pivotal role in shaping the structure and dynamics of many boreal continental-shelf ecosystems. Therefore, in moving to an ecosystem approach to fishery management, the time seemed right for ICES to hold another herring symposium. Since the last ICES symposia on herring in the 1960s (“Herring Symposium”, 1961; “Biology of Early Stages and Recruitment Mechanisms of Herring”, 1968), many of the old paradigms have been rejected, and substantial progress has been made by striking out along new avenues. In addressing this particular topic, we were also able to follow on from the decadal herring symposia series held in North America, and thus cover new research from both the ICES and PICES communities. The symposium took place from 26 to 29 August 2008, at the National University of Ireland, Galway, Ireland.
    • List of Fishery Leaflets Nos. 1 (1938) to 111 (1981)

      Anon. (Department of Fisheries and Forestry (Trade and Information Section), 1981)
      These leaflets provide a medium for distributing information on various aspects of fishery research and development undertaken by Officers of the Department. 111 leaflets have been published to date (December, 1981). A list is attached.
    • List of Fishery Leaflets Numbers 1 (1938) to 50 (1973)

      Anon. (Department of Agriculture and Fisheries (Fisheries Division), 1973)
      These Leaflets provide a medium for distributing information on various aspects of fishery research and development undertaken by officers of the Department. 50 Leaflets have been published to date (May 1973). A list is attached.
    • List of fishery leaflets numbers 1 (1938) to 58 (1973)

      Anon. (Department of Agriculture and Fisheries (Fisheries Division), 1974)
      These Leaflets provide a medium for distributing information on various aspects of fishery research and development undertaken by officers of the Department. 58 Leaflets have been published to date (January 1974). A list is attached.
    • A List of Rotatoria Known to Occur in Ireland with Notes on Their Habitats and Distribution

      Horkan, J. P. K. (Department of Agriculture and Fisheries [Fisheries Division], 1981)
      A total of 315 species of rotifers are known to occur in Ireland. Of these 71 belong to the Bdelloidea and 244 to the Monogononta. Three species new to Ireland are now recorded and one of them is also a new record for the British Isles. A taxonomic list of the 315 species is given together with notes on ecology, where possible, and distribution. The names of recorders are included.
    • A List of Scientific and Engineering Papers by Members of the Staff of the Fisheries Division of the Department of Agriculture and Fisheries 1950-1970

      Anon. (Department of Agriculture and Fisheries (Fisheries Division), 1972)
      The Fisheries Division of the Department of Agriculture and Fisheries conducts researches into many aspects of Irish fishes, fishing and fisheries and a considerable number of papers on a wide range of topics have been published over the years in a number of journals including special publications of the Department, namely Irish Fisheries Investigations Series A (Freshwater) and Series B (Marine) and Fishery Leaflets. The present leaflet gives details of papers published by members, or former members, of the Department’s staff since 1950, as a result of their official work or arising there from. In addition to the papers mentioned below members of the Department's staff have contributed to various international bodies other papers, which have not been published subsequently. The list does not, however, include papers prepared by members of the Department's staff, whilst on secondment to semi-state bodies. Some of the authors have now left the service of the Department and details are given as necessary in the following list, Details are also given of the joint authors who were never in the service of the Department.
    • List of some historical papers etc. on Irish fish, fishing and fisheries 1940-1974

      Went, A E J (Department of Agriculture and Fisheries (Fisheries Division), 1978)
      Since 1940 I have had a keen interest in the history of fish, fishing and fisheries in Ireland and in my capacity as an inspector of fisheries I had an unrivalled opportunity, in my travels around the country, to acquire information on fishing methods, which were becoming, or even had became obsolete. For example, when I was preparing my second paper on the Galway Fishery (No. 6 on list below) I made inquiries at the National Museum, Dublin as to what Irish fishing spears were preserved in that museum. I was surprised to learn that very little material of this kind was available, although I knew that “hoards” of salmon spears, seized by the Boards of Fishery Conservators, were kept in various parts of Ireland. Fortunately I was able to have these, and other spears, mainly for eels, collected up and deposited in the National Museum, which can now claim to have a good representative collection of Irish traditional fishing spears for salmon and eels. My paper on Irish fishing spears (No. 29 on list below) resulted from the collection of the fishing spears referred to above. Articles in newspapers and other popular journals have generally been omitted from the list below, because they were usually based on information given in contributions to the journals etc. of learned and other societies. This list also does not include details of papers on the scientific aspects of Irish fisheries, details of which have already been published in Fishery Leaflet No. 25.
    • Litter and waste breakdown game

      Marine Institute (Marine Institute, 2017)
      The aim of this lesson plan is to investigate how long different types of waste take to breakdown, to understand the impact of litter on our natural environment and to identify what we can do to reduce this impact, all through a visual and hands-on game played with a partner or in a small group.
    • The littoral fauna of Dublin Bay

      Wilson, J G (Department of Fisheries and Forestry, 1982)
      The intertidal sediment macrofauna of Dublin Bay was sampled over a total of 313 sites throughout the bay. The most conspicuous organisms were Nephthys caeca, Nephthys hombergi, Scoloplos armiger, Cerastoderma edule and Tellina tenuis, and in general, the fauna reflected the domination of the Bay by the sand habitats on the North and South Bulls. The standing stock of the Bay was dominated by the bivalves, which contributed over 80% of the biomass, and these in turn owed their supremacy largely to C. edule which accounted for over 80% of bivalve biomass. The bivalves were good indicators of the biotopes in the Bay: an outer sandy zone characterised by T. tenuis, and inner sand/mud zone with C. edule and Macoma balthica and muddy lagoons characterised by Scrobicularia plana and occasionally beds of Mytilus edulis. Bivalaves were absent from the inner Tolka basin where Nereis sp. predominated. Shannon-Weiner Index values for the Bay as a whole were good and there was little wide-spread indication of pollution damage.
    • Lobster Trap Census 1968

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1969)
      A census made in July and in September, 1968 of the number of traps used in the Irish lobster fishery has been used in this paper as the basis for an analysis of lobster catch. The catch figures supplied to the Fisheries Division by various collectors have been correlated with the gear used in the 12 maritime counties involved.
    • Lobster Trap Census 1969

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1970)
      This leaflet adds to the information given in Fishery Leaflet No. 11 (Gibson, 1969) concerning lobster traps used around the Irish coasts in 1968. The catch figures supplied to the Fisheries Division by various collectors have been correlated with the lobster gear used by boats fishing off the 12 maritime counties. The purpose of these continuing records is to provide an annual measure of the effects of fishing upon lobster stocks and thereby to analyse trends in the landings, by comparing annual catch and effort.
    • Lobster Trap Census 1971

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1972)
      This leaflet continues the information provided by Fisheries Leaflets 11, 23 and 26. There was little change in the types of Lobster fishing gear in use in 1971 compared with previous years.
    • Lobster trap census 1972

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1973)
      This leaflet continues the information provided by Fishery Leaflets Nos. 11, 23, 26, and 39. There was little change in the types of Lobster fishing gear in use in 1972 compared with previous years.
    • Lobster Trap Census, 1970

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1971)
      This leaflet continues the information given in Fishery Leaflets No. 11 and 23 concerning lobster traps in use around the Irish coasts. As in previous years the lobster catch figures supplied to the Fisheries Division by various collectors have been correlated with the fishing gear used by boats fishing off the 12 maritime counties. There was little change in 1970 in the preference of the fishermen for the different designs of fishing traps used.
    • Lobster trap census, 1973

      Bhatnagar, K M (Department of Agriculture and Fisheries (Fisheries Division), 1974)
      This leaflet continues the information provided by Fishery Leaflets numbered, 11, 23, 26, 39, and 57. Although more lobster traps (51.0%) were used in relation to French crawfish, (49.0%) in 1973 (Table 1), the order of preference of lobster fishing (all types) remained the same as in previous years as follows: (a) French crawfish traps (b) Scottish creels (or variation thereof) (c) Other types of traps.
    • Long term trends in population dynamics of NW Ireland herring revealed by data archaeology

      Clarke, M.; Egan, A.; Mariani, S.; Miller, D. (International Council for the Exploration of the Sea (ICES), 2011)
      Herring populations to the northwest of Ireland are considered to constitute a single stock. They consist of a diverse array of autumn, winter and spring spawning components. They have been subject to large catches in the past. Landings peaked at 50 000 t in 1987 and have shown a slow decline since, as 2 dominant year classes, born in the 1980s, declined. No strong year classes have appeared since, and the stock is now outside safe biological limits. The time series of data available for stock assessment only covered the period 1970- present, even though routine sampling began after the end of World War I. In order to examine the stock trajectories over time, all catch at age data for the period 1921-1970 were compiled and analysed. The study revealed large fluctuations in the size of the stock and its productivity over time. Occasional strong cohorts occurred either singly, or in close together within 5 years of each other, and were observed at roughly 20-40 year intervals. Interspersed with this were long intervals of poor recruitment. Further historical analyses of 18th and 19th century records confirm this general periodicity. Overall results were examined in the context of time series of sea surface temperature data. The study can provide a basis for development of a long term management plan for the stock, using management strategy evaluation (MSE). The implications of this work, for the rational management of this stock for the future, are discussed.
    • A longitudinal study of amoebic gill disease on a marine Atlantic salmon farm utilising a real-time PCR assay for the detection of Neoparamoeba perurans

      Downes, J.K.; Henshilwood, K.; Collins, E.M.; Ryan, A.; O'Connor, I.; Rodger, H.D.; MacCarthy, E.; Ruane, N.M. (Inter Research, 2015)
      Amoebic gill disease (AGD) is a proliferative gill disease of marine cultured Atlantic salmon Salmo salar, with the free-living protozoan Neoparamoeba perurans being the primary aetiological agent. The increased incidence of AGD in recent years presents a significant challenge to the Atlantic salmon farming industry in Europe. In this study, a real-time TaqMan® PCR assay was developed and validated to detect Neoparamoeba perurans on Atlantic salmon gills and further used to monitor disease progression on a marine Atlantic salmon farm in Ireland in conjunction with gross gill pathology and histopathology. The assay proved specific for N. perurans, with no cross-reactivity with the related species N. pemaquidensis, N. branchiphila or N. aestuarina, and was capable of detecting 2.68 copies of N. perurans DNA μl−1. Although the parasite was detected throughout the 18 mo period of this study, mortality peaks associated with clinical AGD were only recorded during the first 12 mo of the marine phase of the production cycle. The initial AGD outbreak resulted in peak mortality in Week 17, which was preceded by PCR detections from Week 13 onwards. Freshwater treatments were an effective method for controlling the disease, resulting in a reduction in the weekly mortality levels and also a reduction in the number of PCR-positive fish. In comparison to traditional diagnostic methods, our PCR assay proved to be highly sensitive and a valuable tool to monitor disease progression and, therefore, has the potential to provide information on the timing and effectiveness of treatments.
    • A Low-Complexity Mosaicing Algorithm for Stock Assessment of Seabed-Burrowing Species

      Corrigan, D.; Sooknanan, K.; Doyle, J.; Lordan, C.; Kokaram, A. (IEEE Xplore, 2018)
      This paper proposes an algorithm for mosaicing videos generated during stock assessment of seabed-burrowing species. In these surveys, video transects of the seabed are captured and the population is estimated by counting the number of burrows in the video. The mosaicing algorithm is designed to process a large amount of video data and summarize the relevant features for the survey in a single image. Hence, the algorithm is designed to be computationally inexpensive while maintaining a high degree of robustness. We adopt a registration algorithm that employs a simple translational motion model and generates a mapping to the mosaic coordinate system using a concatenation of frame-by-frame homographies. A temporal smoothness prior is used in a maximum a posteriori homography estimation algorithm to reduce noise in the motion parameters in images with small amounts of texture detail. A multiband blending scheme renders the mosaic and is optimized for the application requirements. Tests on a large data set show that the algorithm is robust enough to allow the use of mosaics as a medium for burrow counting. This will increase the verifiability of the stock assessments as well as generate a ground truth data set for the learning of an automated burrow counting algorithm.
    • Mackerel Egg Survey, July 8th - 28th 2010

      O'Hea, B (Marine Institute, 2010)
      Every three years the International Council for the Exploration of the Sea (ICES) coordinates a series of mackerel and horse mackerel egg surveys covering the eastern Atlantic from Gibraltar to the north coast of Scotland between January and July. The aim of this survey programme is to assess the northeastern Atlantic mackerel and horse mackerel stock. The Marine Institute participates in this programme and covers stations in the Celtic Sea and West of Ireland. Plankton samples were collected at 102 stations, and the eggs they contained were preserved in 4% buffered formaldehyde. Preliminary analysis shows that egg numbers were concentrated close to the shelf edge, around the 200m contour line. Ten fishing hauls were made to collect mackerel and horse mackerel samples for fecundity analysis. Samples were collected to ensure maximum temporal and geographical spread.