scholarly journals Life History and Ecology of Bluenose Warehou (Hyperoglyphe antarctica, Centrolophidae) in the Southern Atlantic

2021 ◽  
Vol 8 ◽  
Author(s):  
James B. Bell ◽  
Vladimir Laptikhovsky ◽  
David K. A. Barnes ◽  
Ramon Benedet ◽  
Amelia E. Bridges ◽  
...  
Keyword(s):  
Life History ◽  
United Kingdom ◽  
Cold Water ◽  
Stock Assessment ◽  
Habitat Preferences ◽  
Longline Fishery ◽  
Target Species ◽  
Commercial Fish ◽  
Life History Data ◽  
The United Kingdom

Bluenose warehou (Hyperoglyphe antarctica) is a popular commercial fish in Australia and New Zealand, but its biology and ecology are very poorly known in other regions where it is found. We present here the first life history data for this species from the south Atlantic, focusing upon the exclusive economic zone (EEZ) of the United Kingdom Overseas Territory (UKOT) of Tristan da Cunha (TdC). Here, bluenose is known from several seamounts and island margins, typically occurring in waters between 200 and 1,000 m depth and is the target species of trawl and longline fishery operating since 1997. We use a suite of methods to describe important life history parameters, including length-weight and age-length relationships and size at recruitment, as well as examining commercial longline survey data to uncover habitat preferences of bluenose. This work has formed an important part of the United Kingdom government’s Blue Belt Program in TdC. It has underpinned the development of the first stock assessment for this species in the Atlantic, as well as a range of improved conservation measures for some of the more vulnerable species that occur in these areas, including seabirds and cold-water corals.

Caribbean Commission

1951 ◽  
Vol 5 (4) ◽  
pp. 810-811
Keyword(s):  
United Kingdom ◽  
Fish Species ◽  
Joint Meeting ◽  
Research Committee ◽  
Commercial Fish ◽  
The United Kingdom ◽  
Trawl Fishing ◽  
The Caribbean

A joint meeting of the Research Committee on Agriculture, Fish, Wildlife and Forestry and the Preparatory Fisheries Committee was held in Trinidad on July 9, 1951. The meeting, under the chairmanship of the United Kingdom representative (Frampton), discussed proposals regarding commercial trawl fishing in the Gulf of Paria and the organization of the Fisheries Conference. The committee felt that a survey of commercial trawl fishing should be undertaken at an estimated expense of $2,000. The committee also recommended that the Fisheries Conference, to be held in March 1952 for five days, should meet in Trinidad and have an agenda as follows: occurrence and distribution of commercial fish species in the Caribbean, techniques used in the Caribbean for fish capture, types of fishing craft used, marketing, storing, distribution, conserving methods, and cultivation of fish in ponds.

scholarly journals A stepwise stochastic simulation approach to estimate life history parameters for data-poor fisheries

2016 ◽  
Vol 73 (12) ◽  
pp. 1874-1884 ◽  
Author(s):  
Marc O. Nadon ◽  
Jerald S. Ault
Keyword(s):  
Life History ◽  
Stock Assessment ◽  
Probability Distributions ◽  
Size Composition ◽  
History Data ◽  
Life History Parameters ◽  
Life History Data ◽  
Novel Approach ◽  
Cost Efficient ◽  
Species Specific

Coastal fisheries are typically characterized by species-rich catch compositions and limited management resources, which typically leads to notably data-poor situations for stock assessment. Some parsimonious stock assessment approaches rely on cost-efficient size composition data, but these also require estimates of life history parameters associated with natural mortality, growth, and maturity. These parameters are unavailable for most exploited stocks. Here, we present a novel approach that uses a local estimate of maximum length and statistical relationships between key life history parameters to build multivariate probability distributions that can be used to parameterize stock assessment models in the absence of species-specific life history data. We tested this approach on three fish species for which empirical length-at-age and maturity data were available (from Hawaii and Guam) and calculated probability distributions of spawning potential ratios (SPR) at different exploitation rates. The life history parameter and SPR probability distributions generated from our data-limited analytical approach compared well with those obtained from bootstrap analyses of the empirical life history data. This work provides a useful new tool that can greatly assist fishery stock assessment scientists and managers in data-poor situations, typical of most of the world’s fisheries.

scholarly journals Length at maturity of two pelagic sharks (Isurus paucus and Carcharhinus longimanus) found off northern Cuba

2020 ◽  
Author(s):  
A Ruiz-Abierno ◽  
JF Márquez-Farías ◽  
M Trápaga-Roig ◽  
RE Hueter
Keyword(s):  
Stock Assessment ◽  
Logistic Models ◽  
Binary Logistic Regression ◽  
Small Scale ◽  
Shark Species ◽  
Longline Fishery ◽  
Regional Structure ◽  
Life History Data ◽  
Median Size ◽  
Management Measures

Many shark species show regional structure and seasonal movements, complicating the gathering of life history data needed for fisheries management. Length-at-maturity is a relatively straightforward trait to quantify through the sampling of fisheries landings and is of great value for stock assessment. We report here on the median size at maturity for the longfin mako (Isurus paucus) and the oceanic whitetip shark (Carcharhinus longimanus), two important pelagic sharks caught by the small-scale longline fishery operating off northwest Cuba. We determined the maturity stages for 118 longfin makos and 84 oceanic whitetip sharks, based on the development of internal and external organs. A binary logistic regression was applied to estimate model coefficients necessary to describe proportion mature at size and determine L50 and the steepness of the model (Φ). For the longfin mako, the parameters of logistic models for males were L50 = 215 cm TL (CI: 210–220 cm TL), Φ = 4.46 (CI: 2.30–8.64) and for females L50 = 230 cm TL (CI: 220–239 cm TL), Φ = 9.79 (CI: 5.15–18.62). For the oceanic whitetip shark, the parameters for males were L50 = 203 cm TL (CI: 186–220 cm TL), Φ = 14.59 (CI: 6.74–31.58) and for females L50 = 199 cm TL (CI: 187–211 cm TL), Φ = 7.48 (CI: 2.56–21.8). The parameters presented here contribute to stock assessment and management measures for global conservation of these transboundary, highly vulnerable species of pelagic sharks.

Using model-based inference to evaluate global fisheries status from landings, location, and life history data

2012 ◽  
Vol 69 (4) ◽  
pp. 645-655 ◽  
Author(s):  
James T. Thorson ◽  
Trevor A. Branch ◽  
Olaf P. Jensen
Keyword(s):  
Logistic Regression ◽  
Life History ◽  
Research Agenda ◽  
Cross Validation ◽  
Stock Assessment ◽  
Location Data ◽  
Life History Data ◽  
Model Based ◽  
Stock Assessments ◽  
Fishery Status

Assessing fishery collapses worldwide is hindered by the lack of biomass data for most stocks, leading to the use of landings-based proxies or the assumption that existing stock assessments are globally representative. We argue that the use of sparse assessments to evaluate fishery status requires model-based inference because assessment availability varies spatially and temporally, and we derive a model that extrapolates from assessment results to available landings, life history, and location data. This model uses logistic regression to classify stocks into different prediction bins and estimates the probability of collapse in each using cross-validation. Results show that landings, life history, and location are informative to discriminate among different probabilities of collapse. We find little evidence that regions with fewer assessments have a greater proportion of collapsed stocks, while acknowledging weak inferential support regarding regions with one or fewer assessments. Our extrapolation suggests that 4.5%–6.5% of stocks defined by landings data are collapsed, but that this proportion is increasing. Finally, we propose a research agenda that combines stock assessment and landings databases while overcoming limitations in each.

Life-history of Phragmidium rubi-idaei on red raspberry in the United Kingdom

1985 ◽  
Vol 34 (4) ◽  
pp. 510-520 ◽  
Author(s):  
VIVIENNE M. ANTHONY ◽  
R. C. SHATTOCK ◽  
B. WILLIAMSON
Keyword(s):  
Life History ◽  
United Kingdom ◽  
Red Raspberry ◽  
The United Kingdom ◽  
History Of

scholarly journals Biological Knowledge of Thornback Ray (Raja clavata) from the Azores: Improving Scientific Information for the Effectiveness of Species-Specific Management Measures

Biology ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 676
Author(s):  
Régis Santos ◽  
Wendell Medeiros-Leal ◽  
Ana Novoa-Pabon ◽  
Osman Crespo ◽  
Mário Pinho
Keyword(s):  
Life History ◽  
Habitat Degradation ◽  
Stock Assessment ◽  
Scientific Information ◽  
Habitat Preferences ◽  
Movement Pattern ◽  
Biological Knowledge ◽  
Thornback Ray ◽  
Raja Clavata ◽  
Species Specific

Elasmobranchs are globally recognized as vulnerable due to their life-history characteristics, fishing pressure, and habitat degradation. Among the skates and rays caught by commercial fisheries, the thornback ray Raja clavata is one of the most economically important in Northwest European seas. However, the scarcity of biological knowledge about this species in Azorean waters has limited the stock assessment types that can be conducted. To improve information on its habitat preferences, spatial distribution and movement pattern, growth, sex ratio, mortality, and reproduction, as well as to investigate long-term changes in abundance and size, this study analyzed approximately 25 years of fishery-dependent and independent data from the Azores. Raja clavata was mainly caught at depths up to 250 m. Most of the tagged fish were recaptured near the release point. A larger–deeper trend was found, and females were larger and more abundant than males. Life-history parameters showed that R. clavata has a long lifespan, large size, slow growth, and low natural mortality. The sustainability of its population is of concern to fisheries management and, while our findings suggested a relatively healthy stock in the Azores, a thorough increase in data quality is required to better understand the stock condition and prevent overexploitation.

A comparison of the United Kingdom Clinical Aptitude Test (UK-CAT) with a traditional admission selection process

2009 ◽  
pp. 1-6 ◽  
Author(s):  
Nishan Fernando ◽  
Gordon Prescott ◽  
Jennifer Cleland ◽  
Kathryn Greaves ◽  
Hamish McKenzie
Keyword(s):  
United Kingdom ◽  
Selection Process ◽  
Aptitude Test ◽  
The United Kingdom
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