Oliver Tully

Oliver Tully
Marine Institute · Fisheries Ecosystems Advisory Services (FEAS)

Doctor of Philosophy

About

55
Publications
8,676
Reads
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1,984
Citations
Additional affiliations
February 1990 - May 2003
Trinity College Dublin
Position
  • Research Associate

Publications

Publications (55)
Article
Full-text available
The velvet swimming crab Necora puber has been fished in Ireland since the early 1980s and contributes significant income to smaller fishing vessels. From 2016 onwards, reduced landings have been reported. We undertook a full pathological investigation of crabs from fishing grounds at 3 sites on the west (Galway), southwest (Castletownbere) and eas...
Article
Full-text available
Fisheries bycatch represents a major anthropogenic threat to marine megafauna worldwide. To identify populations at risk, it is essential to estimate the total number of individuals removed from a population as bycatch. However, estimating total bycatch remains challenging due to the often-limited scope of monitoring programmes. In this study, we a...
Article
Bycatch of protected species in static net fisheries is a global conservation concern and is currently considered the dominant anthropogenic threat facing many marine mammal species. Effective bycatch mitigation remains challenging, contingent on an understanding of the underlying mechanisms that cause individuals to become entangled. We combined d...
Conference Paper
Full-text available
Dundalk Bay in Co. Louth, Ireland holds the largest wintering Oystercatcher (Haematopus ostralegus) population in Ireland with numbers regularly exceeding 10,000. There is also a large Cockle (Cerastoderma edule) fishery in Dundalk Bay. As part of a monitoring programme required by the Fishery Natura Plan for Dundalk Bay, we monitored the Oystercat...
Article
In this article, we undertake the first broad-scale, cross-institutional collaboration to collect data on the size at maturity and reproductive strategy of the commercially fished decapod crab species, Cancer pagurus. Using identical methodology and temporal sampling, morphometric and physiological estimates of size at maturity were undertaken usin...
Article
This study assesses the seabed pressure of towed fishing gears and models the physical impact (area and depth of seabed penetration) from trip-based information of vessel size, gear type, and catch. Traditionally fishing pressures are calculated top-down by making use of large-scale statistics such as logbook data. Here, we take a different approac...
Article
Full-text available
Hydraulic dredging for bivalves, such as cockles (Cerastoderma edule), has the potential to cause significant impacts on marine intertidal benthos. Although this fishing activity is common in northern European Natura 2000 sites such impacts may be incompatible with conservation objectives for designated habitats and species within these sites. In 2...
Chapter
Full-text available
The chapter provides an overview of the life history and fisheries of the two clawed lobster species of the North Atlantic: the American lobster, Homarus americanus, and the European lobster, H. gammarus. The authors highlight new findings on the ecological factors affecting population dynamics, connectivity, and trophic interactions. The American...
Article
Small-scale fisheries have traditionally received less research effort than large-scale fisheries and are generally under-studied in Europe. In spite of their comparatively low volume of catches and economic importance, small-scale fisheries are socially important and an integral part of the European coastal zone. Considering the high heterogeneity...
Article
Full-text available
The combined effects of temperature and salinity on the survival and development of larval and juvenile Palaemon serratus from the west coast of Ireland were investigated. Survival over time was measured at thirty combinations of temperature and salinity ranging from 10–19°C and 9–34‰ in a fully factorial design. Salinity had a stronger influence t...
Article
Infestation parameters for the calígíd copepod Lepeophtheirus salmonis (Kroyer) infesting sea trout, Salmo trutta L., were established for a number of locations off the west coast of Ireland during 1990 and 1991. Based on these parameters sites were classified into two groups in 1990 and three in 1991. Median parasitic intensity in these groups was...
Chapter
The relationship between sea lice infestation on sea trout with distance to salmon aquaculture sites for a broad geographic range of Irish rivers was examined over a 10-year period. Highest mean levels of total lice and juvenile (chalimus stages) lice were recorded at sites less than 20 km from farms. The mean total lice infestation was lower at si...
Article
Full-text available
The scallop fisheries off the southeast coast of Ireland have historically been considered a valuable resource for coastal communities, and hence their management is important. The scallop fishing grounds consist of a number of scallop beds dispersed throughout the St George's Channel and the southern Irish Sea. The boundaries between stocks and th...
Technical Report
Full-text available
The necessity of improving knowledge in fisheries and especially small-scale coastal fisheries in order to analyse the conditions for their sustainable development is increasingly recognized. The three main requirements for the sustainable development of fisheries are the simultaneous present and future well being of the bio-ecological system, the...
Article
A total of 129 sea trout smolts from 10 locations on the west coast of Ireland were examined for metazoan parasites. Of 11 species identified only four had a prevalence >20%. Two species Hysterothylacium aduncum and Hemiuris communis have a confirmed marine origin; Eubothrium crassum has been shown to exist in both the sea and fresh water. The rema...
Article
The aim in this paper is to put forward an approach to the issue of access rights that is suitable to Ireland's crustacean and molluscan fisheries. We begin by reviewing proceedings of a recent international conference on the issue of property rights in fisheries. We then pose objectives for fisheries management to be met by our approach. Following...
Article
Proceedings of the Conference on Life History Assessment and Management of Crustaceans, La Coruna, Galicia, Spain, 8–11 October 2001
Article
Total fish trapping facilities that enable monitoring of all migrating fish have been operating in the Burrishoole river system, west of Ireland, since 1970. Ocean ranching of reared salmon smolts has been used since the early 1960s to supplement grilse returns to the rod fishery and as a research tool for assessing marine survival and exploitation...
Article
Lipofuscin accumulation is associated with ageing at the subcellular level. A strong correlation between lipofuscin and age has been found in crustaceans using histological techniques. This association has been proposed as the basis for a methodology to age crustaceans and in some cases lipofuscin levels were found to be better correlated with age...
Article
Lepeophtheirussalmonis is a specific parasite of salmonids that occurs in the Atlantic and Pacific Oceans. When infestations are heavy fish mortality can occur although the factors that are responsible for causing epizootics, especially in wild salmonid populations are still largely unknown. Over the past 20 years this parasite has caused significa...
Article
Variation in sensitivity of Lepeophtheirus salmonis (Krøyer) to dichlorvos in static toxicity tests was recorded on salmon farms in Ireland. Five hour LC50s ranged from 60 to 202 μg l −1 at 15 °C for five farms in Autumn 1991 and 76–151 μg l−1 at 10 °C for four farms in Spring of 1992. Resistance ratios, calculated using the most sensitive sites as...
Article
Measuring baseline cortisol in wild salmonids is problematic because of the stress induced by most capture methods. The cortisol response to different periods of confinement stress was modelled in a laboratory population of rainbow trout [Oncorhynchus mykiss (Walbaum)]. A quadratic model was used to predict baseline (precapture) cortisol levels in...
Article
Full-text available
The geographic range of the American lobster spans a very large temperature gradient. The gradient’s effects on growth and the onset of maturity are well known, but young age classes restricted to nursery grounds tend to overlap more in cooler regions than in warm regions, and the resulting effects on growth and survival are poorly understood. In f...
Article
In total, 7619 v-notched lobsters were released in the Wexford lobster fishery in Ireland between 1994 and 1999 in order to increase egg production. These lobsters were legally protected from fishing. Annual reproductive potential (RP) from these lobsters, based on numbers and size at release, was 2.6×107 eggs. Average ( 95% confidence limit) stand...
Article
Fecundity and size at maturity of the European lobster Homarus gammarus (Crustacea: Decapoda) was estimated in four coastal regions of Ireland. Egg size increased with carapace length (CL) (egg size=0·9939×ln (CL)−3·0809). The size–fecundity relationship for all coasts combined was (fecundity=0·0044×CL3·1554). Physiological maturity was assessed us...
Article
 The accumulation of lipofuscin, which is an indictor of physiological age, in the brain of juvenile European lobster (Homarus gammarus L.) was monitored for 22 mo in three experimental temperature regimes that simulated seasonal variation in temperature in the geographic range of this species. Metabolic rate responses to changes in temperature wer...
Article
Full-text available
Quantitative suction samples of benthic decapod fauna were taken in the south of Ireland during 1997. Some species settled into the area, but failed to persist to the first winter, while others were present in high numbers throughout the year. The duration of settlement was species-specific, ranging from several weeks to several months. Body size a...
Article
Full-text available
Sub-tidal populations of decapod crustaceans from 5 distinct benthic habitats were sampled at the end of the main settlement season. Divers, using SCUBA equipment, estimated substrate characteristics and complexity, removed sediment samples, and collected quantitative samples of the resident communities using suction sampling at each of the sites....
Article
A subtidal population of the anomuran crab, Pisidia longicornis was sampled quantitatively throughout 1997. Divers, using SCUBA equipment, conducted suction sampling each month, with concentrated effort directed towards the settlement season. Pisidia occurred in very high densities, constituting the major component of decapod community abundance. G...
Article
Infestations of post-smolt sea trout (Salmo trutta L.) by the salmon louse (Lepeophtheirus salmonis Krøyer) were characterized in 42 estuaries over a 5 year period in Ireland. Spatial variation in infestation was more significant than temporal trends and existed at 3 levels; between regions (regions > 100 km of coastline), between bays within regio...
Article
Morphological lipofuscin was quantified in laboratory cultured Homarus gammarus to determine if the amount of pigment was correlated with age and culture temperature in this species. Two cohorts were monitored for 34 and 18 months, respectively. An age dependent accumulation of lipofuscin concentration (expressed as % area fraction) occurred (Y = −...
Article
Full-text available
Lipofuscin content was determined in the brains of 41 American lobsters Homarus americanus (Milne-Edwards) aged 4, 13 and 27 mo reared individually at 19 to 20 degrees C. Lipofuscin was quantified by fluorescence microscopy and image analysis. Lipofuscin granules occurred in each age group and in the oldest group appeared as large aggregations coll...
Article
Trials were conducted in experimental tanks and in commercial scale sea cages to evaluate the ability of wrasse to control sea lice infestations on farmed Atlantic salmon smolts. In a 3 h tank trial rockcook wrasse, Centrolabrus exoletus (L.), removed an average of 19 lice per fish h−1 from salmon smolts infested mainly by Caligus elongatus Nordman...
Book
Full-text available
Proceedings of a two-day seminar held in February 1993, consisting of 12 invited papers and 13 offered contributions. There are reviews and case studies of Irish freshwater resources, of the Lower Shannon basin, of river water quality, of turloughs, of Irish marine habitats, of Strangford Lough and Kinsale Harbour. Conservation of aquatic organisms...
Article
Male and female length frequency distributions (LFDs) of Nephrops norvegicus (L.) were spatially autocorrelated at different scales on a grid of stations sampled in the Irish Sea in both 1989 and 1990. Female LFDs were correlated up to a range of 15 km and males up to 25 km. Cluster analysis of the LFDs, interpreted taking into account the autocorr...
Article
The number and fecundity of ovigerous Lepeophtheirus salmonis (Krøyer) infesting wild and farmed salmon and daily production, from these fish, of nauplius I of L. salmonis was estimated for a number of areas off the west coast of Ireland between March and July 1991. Significant differences in body size and fecundity of the parasite were apparent bo...
Article
The intensity and timing of infestation events of caligid copepods in wild or cultured fish populations may be predicted from previous local production of nauplius I of the parasite. However, this relationship is not well established, the spatial scales over which it operates are unclear, and the role of host reactions to the invading copepodid is...
Article
Two surveys were carried out in the Corrib catchment (Ireland) to determine the physical and chemical factors that govern the distribution of Corixidae. Of the twenty one species recorded, five species, Sigara scotti (Fieber), S. distincta (Fieber), S. fossarum (Leach), S. fallenoidea (Hungerford) and Cymatia bonsdorffii (Sahlberg) comprised 82% of...
Article
Generation times of C. elongatus were c49-81 d depending on water temperatures. Those of L. salmonis were also temperature dependent and estimated at 48-92 d. Reproductive output of L. salmonis was greatly reduced at summer temperatures (12-16°C) as most pre-adult females failed to mature before November. Size at each parasitic stage of L. salmonis...
Article
The ichthyofauna of the neustal (0 to 10 cm) and immediate subsurface water (12 to 48 cm) of Galway Bay was sampled during the day from June 1983 to September 1984 and at night from May to September 1984. Species diversity (H) and the number of species per sample were significantly higher at night. The density of larvae at night was higher only dur...
Article
A total of 50 lobster larvae were recorded in the neuston of Galway Bay, west of Ireland, from June to November 1983 and May to September 1984. One abnormal stage 4 larva was recorded. A total of 241 larvae were collected in 60 samples taken over two 24-hour sampling sessions. Larvae display diel vertical migration to and from the neuston. Densitie...

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Project (1)
Project
Develop decision support tools for spatial planning in marine coastal environments