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91 results for “trawl”
Figure 4 in Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil
Figure 4. Cephalopoda bycatch of trawl fisheries targeting Xiphopenaeus kroyeri on coast of Sergipe: (A) Callistoctopus macropus, (B) Lolliguncula brevis. Scale bars:1 cm.
Figure 2 in Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil
Figure 2. Gastropoda bycatch of trawl fisheries targeting Xiphopenaeus kroyeri on coast of Sergipe: (A) Architectonica nobilis, (B) Bulla striata, (C) Crepidula plana, (D) Crepidula protea, (E) Cancellaria reticulata, (F) Tonna galea, (G) Columbella mercatoria, (H) Erosaria acicularis, (I) Macrocypraea zebra, (J) Charonia variegate, (K) Siratus sp., (L) Phyllonotus oculatus, (M) Siratus senegalensis, (N) Stramonita brasiliensis, (O) Distorsio clathrata, (P) Terebra taurina, (Q) Lobatus gallus, (R) Vasum cassiforme, (S) Voluta ebraea, (T) Xenophora conchyliophora. Scale bars: A-E, G-H, K-O = 5 mm; F, I-J, P-Q, S-T = 10 mm.
Figure 1 in Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil
Figure 1. Map of study area showing sampling stations and transects on continental shelf off state of Sergipe.
Figure 3 in Mollusk bycatch in trawl fisheries targeting the Atlantic seabob shrimp Xiphopenaeus kroyeri on the coast of Sergipe, northeastern Brazil
Figure 3. Bivalvia bycatch of trawl fisheries targeting Xiphopenaeus kroyeri on coast of Sergipe: (A) Anadara chemnitzii, (B) Acrosterigma magnum, (C) Arca zebra, (D) Chama sp., (E-F) Arcinella brasiliana, (G) Mulinia cleryana, (H) Spathochlamys benedicti, (I) Psammotella cruenta, (J) Pteria colymbus, (K) Pitar aresta, (L) Eurytellina punicea. Scale bars: A-B, E-F, I-J, L = 5 mm; C-D, G-H, K = 2 mm.
Fig. 1 in Patterns In Community Structure Of Trawl Catches Along Coastal Area Of The South China Sea
Fig. 1. Map of the study area.
Species counts, depth and latitude from NOAA's annual groundfish trawl surveys (1999-2018) in the Northeast Pacific
<p>These data are provided as Supporting Information to the article appearing in Ecology Letters entitled: "Non-linear models of species' responses to environmental and spatial gradients".</p> <p>The article describes a parametric framework for modelling species-environment non-linear relationships, including an R package ('<em>senlm</em>'), available on Github: <a href="https://primer-e.github.io/senlm">https://primer-e.github.io/senlm</a>. The framework has two components: (i) a non-linear parametric mathematical function to model the mean species response along a gradient that allows asymmetry, flattening/peakedness or bimodality; and (ii) a statistical error distribution tailored for ecological data types, allowing intrinsic mean-variance relationships and zero-inflation. The article demonstrates the utility of this model framework, highlighting the flexibility of a range of possible mean functions and a broad range of potential error distributions, in analyses of fish species' abundances along a depth gradient, and how they change over time and at different latitudes.</p> <p>A vignette in R ('Vignette_S1.pdf') and associated R code ('Rcode_S1.txt') that utilise this dataset to demonstrate the <em>senlm</em> modeling framework are available as Supporting Information to the article.</p>
Simulated trapping and trawling exert similar selection on fish morphology
<p>Commercial fishery harvest can influence the evolution of wild fish populations. Our knowledge of selection on morphology is however limited, with most previous studies focusing on body size, age and maturation. Within species, variation in morphology can influence locomotor ability, possibly making some individuals more vulnerable to capture by fishing gears. Additionally, selection on morphology has the potential to influence other foraging, behavioural, and life-history related traits. Here we carried out simulated fishing using two types of gears: a trawl (active gear) and trap (a passive gear), to assess morphological trait-based selection in relation to capture vulnerability. Using geometric morphometrics, we assessed differences in shape between high and low vulnerability fish, showing that high vulnerability individuals display shallower body shapes regardless of gear type. For trawling, low vulnerability fish displayed morphological characteristics that may be associated with higher burst-swimming, including a larger caudal region and narrower head, similar to evolutionary responses seen in fish populations responding to natural predation. Taken together, these results suggest that divergent selection can lead to phenotypic differences in harvested fish populations.</p>
Data from: Internal injuries in marine fishes caught in beam trawls using electrical versus mechanical stimulations
<p><span>To improve the ecological and economic sustainability in the Dutch beam trawl fishery, tickler chains were replaced by electrical pulse stimulation to drive sole (<em>Solea</em> <em>solea</em>) out of the seabed. Because electrical stimulation may cause internal injuries, we quantified this risk by sampling fish species from commercial beam trawlers and recording spinal injuries and haemorrhages from X-radiographs and autopsy. To distinguish mechanically and electrical-pulse-induced injuries, we compared injuries in ten species sampled from pulse (PUL) and tickler-chain (TCK) trawlers and four species sampled from PUL trawlers with the stimulus switched on or off. Co-occurrence of a major spinal injury and major haemorrhage at the same location was only observed in PUL samples, and were frequently (40%) observed in cod (<em>Gadus</em> <em>morhua</em>) and in low numbers (0–2%) in whiting (</span><span><em>Merlangius</em> <em>merlangus</em>)</span><span>, grey gurnard (<em>Eutrigla</em> <em>gurnardus</em>), and greater sandeel </span><span>(<em>Hyperoplus</em> <em>lanceolatus</em>),</span><span> but not in flatfishes and other species. In cod, injury occurrence correlated with fish length, with lower probabilities for small fish. Major spinal injury or major haemorrhage occurrence in PUL (range: <1–16%) was lower than in TCK (range: <1–42%) in eight of the ten species studied. Population-level consequences of pulse-induced injuries are considered negligible.</span></p>
Data from: Bottom trawling affects fish condition through changes in the ratio of prey availability to density of competitors
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Selection of indicators for assessing and managing the impacts of bottom trawling on seabed habitats
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Species counts, depth and latitude from NOAA's annual groundfish trawl surveys (1999-2018) in the Northeast Pacific
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Data from: Bottom trawling and multi-marker eDNA metabarcoding surveys reveal highly diverse vertebrate and crustacean communities: A case study in an urbanized subtropical estuary
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Data from: Stable isotopes reveal the effect of trawl fisheries on the diet of commercially exploited species
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Simulated trapping and trawling exert similar selection on fish morphology
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Data from: Fishing in the gene-pool: Implementing trawl-associated eDNA metaprobe for large scale monitoring of fish assemblages
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Data from: Internal injuries in marine fishes caught in beam trawls using electrical versus mechanical stimulations
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Data from: Shortspine thornyhead and rockfish (Scorpaenidae) distribution in response to substratum, biogenic structures and trawling
Learmonth Bank in northern British Columbia sustains an active trawl fishery that returns large bycatches of deep-sea sponges and corals. To examine effects of biogenic structures on the distribution of fish, we examined nearly 30 km of high-definition imagery from a remotely operated vehicle and documented locations of 2770 scorpaenid fish. The 2 local genera have similar abundances, averaging about 1.2 individuals 100 m–2, but have different spatial abundance patterns: shortspine thornyhead Sebastolobus alascanus are randomly distributed on featureless substrata and their abundance increases with depth. Rockfish Sebastes spp. associate with higher seafloor relief nonrandomly and select for sponges and corals over the inert substrata alone; 95% of the rockfish occurred on 27% of the seafloor surveyed. Sponges (Demospongia and Hexactinellida) were abundant on the bedrock and boulders of the bank and adjacent moraine and covered 30 to 55% of the seafloor compared with 1% of the sediment and aggregates of the surrounding basin. The majority of rockfish (80%) occurred with sponges ≥50 cm in height, and even beds of short sponges attracted 4 times as many rockfish than did substrata with no large epifauna. While over half of primnoid corals over 30 cm tall had associated rockfish, less than 2% of the seafloor had large coral, and small coral had no associated rockfish. On the adjacent seafloor with past trawling activity, Primnoa pacifica was 13 times less abundant, and large corals and sponges were rare. Thornyhead abundance doubled but rockfish had a 3-fold reduction in numbers. Our study indicates that degradation of biogenic structures is a long-term detriment to rockfish species and, although the mechanism remains unclear, our data suggest it occurs through the destruction of a habitat that is more effective for shelter than rough inert seafloor.
Data from: Estimating sensitivity of seabed habitats to disturbance by bottom trawling based on the longevity of benthic fauna
Bottom fishing such as trawling and dredging may pose serious risks to the seabed and benthic habitats, calling for a quantitative assessment method to evaluate the impact and guide management to develop mitigation measures. We provide a method to estimate the sensitivity of benthic habitats based on the longevity composition of the invertebrate community. We hypothesize that long-lived species are more sensitive to trawling mortality due to their lower pace of life (i.e. slower growth, late maturation). We analyse data from box-core and grab samples taken from 401 stations in the English Channel and southern North Sea to estimate the habitat-specific longevity composition of the benthic invertebrate community and of specific functional groups (i.e. suspension feeders and bioturbators), and examine how bottom trawling affects the longevity biomass composition. The longevity biomass composition differed between habitats governed by differences in sediment composition (gravel and mud content) and tidal bed-shear stress. The biomass proportion of long-lived species increased with gravel content and decreased with mud content and shear stress. Bioturbators had a higher median longevity than suspension feeders. Trawling, in particular by gears that penetrate the seabed >2cm, shifted the community towards shorter-lived species. Changes from bottom trawling were highest in habitats with many long-lived species (hence increasing with gravel content, decreasing with mud content). Benthic communities in high shear stress habitats were less affected by bottom trawling. Using these relationships, we predicted the sensitivity of the benthic community from bottom trawling impact at large spatial scale (the North Sea). We derived different benthic sensitivity metrics that provide a basis to estimate indicators of trawling impact on a continuous scale for the total community and specific functional groups. In combination with high resolution data of trawling pressure, our approach can be used to monitor and assess trawling impact and seabed status at the scale of the region or broadscale habitat and to compare the environmental impact of bottom-contacting fishing gears across fisheries.
Data from: Elasmobranch bycatch in the demersal prawn trawl fishery in the Gulf of Papua, Papua New Guinea
The elasmobranch bycatch of the Gulf of Papua Prawn Fishery is investigated in detail for the first time. Fisheries observers collected data on the elasmobranch bycatch from a total of 403 trawl sets (1,273 hrs) in the Gulf of Papua. A total of 40 species of elasmobranchs were recorded ranging in size from a 12 cm disc width stingray to a 350 cm total length sawfish. High mortality rates were recorded (>80%), attributed to the long trawl durations (up to 4 hours). The future inclusion of bycatch reduction devices would likely reduce the number of larger elasmobranchs being caught and is being investigation by the PNG National Fisheries Authority. Differences in catch compositions were detected across the management zones as well as between the two monsoonal seasons (SE Monsoon and NW Monsoon). Increased monitoring and additional research is required and management plans should address the elasmobranch bycatch and in particular their high mortality rate.
Figure 1 in Bycatch of Asteroidea from shrimp trawl fishery in the southwestern Atlantic Ocean - Brazil
Figure 1. Map of the study area of Marine Protected of the Santana Archipelago, Macaé (RJ).
ScienceDex guides
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.