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124 results for “sea lice”
Data from: Timing and probability of arrival for sea lice dispersing between salmon farms
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Data from: Next-generation matrices for marine metapopulations: the case of sea lice and salmon farms
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The negative association of sea lice from fish farms on recreational fishing catches of Atlantic salmon
<p>The question of whether and to what extent sea-louse (<em>L. salmonis)</em> infestations from salmon farms influence wild Atlantic salmon survival has been subject to sustained scientific debate and political controversy. Documenting the population-level effects of sea lice on wild salmon remains inherently challenging. We employ comprehensive sea-lice data and recreational catch data from Norway to assess the impact of farm sea-louse infestations on wild salmon catches in different production areas (PAs). Our analysis finds a significant correlation between declines in wild Atlantic salmon catches and increasing amounts of adult female sea lice per km<sup>2</sup>. The effect is most pronounced in PA 4 on the west coast of Norway, an area within the government's "traffic light" management system where out-migrating salmon smolts are deemed to face high exposure to louse-induced mortality risk. Our model predicts below-average catches when the total sea louse load exceeds the government's limit of 0.1 average adult female sea louse per farmed fish within some production areas. Furthermore, our results indicate that the risk of below-average catches increases by approximately 47% when salmon farms exceed this limit (estimated risk ratio of 1.47, 95 % CI [1.10, 1.96]).</p> <p><em>Synthesis and Applications</em>: Our study expands the existing body of evidence demonstrating a negative association between fish farming and the ecosystem services provided by wild salmon stocks. It has important implications for aquaculture management. First, it shows that farm sea lice directly affect peoples, rights holders, and interest groups, such as landowners and anglers, who rely on viable populations of wild salmon. Second, it suggests that a >0.1 sea lice limit may be insufficient to prevent subpar catches in some areas. Furthermore, in the context of allowing further growth in farmed salmon biomass, setting absolute sea-louse limits for entire production areas may be a more effective regulatory instrument than setting average lice limits per farmed fish. Our findings contribute to advancing a scientific basis for setting appropriate louse limits on farm and area scales.</p>
Fig. 4. Caligus equulae Nordmann, female. A. leg 2. B. leg 3. C. leg 4 in Sea lice (Copepoda, Siphonostomatoida, Caligidae) new to Korea, including three new species
Fig. 4. Caligus equulae Nordmann, female. A. leg 2. B. leg 3. C. leg 4. Scales=0.05 mm for all.
The negative association of sea lice from fish farms on recreational fishing catches of Atlantic salmon
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Parasite scars: The impact of salmon lice injury on sea trout populations
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FIGURE 3. a in Chewing lice (Phthiraptera: Amblycera, Ischnocera) from Red Sea gulls with new host-parasite records
FIGURE 3. a, male Actornithophilus piceus lari; b, male Austromenopon transversum; c, male Quadraceps punctatus clayae; d, male Quadraceps punctatus regressus; e, male Saemundssonia lari; f, female Saemundssonia lari.
FIGURE 2 in Chewing lice (Phthiraptera: Amblycera, Ischnocera) from Red Sea gulls with new host-parasite records
FIGURE 2. Map showing collection sites along the Red Sea coast of Saudi Arabia. 1, Umm Al-Malik Island, Near the coast of Tabuk; 2, the coast of Jeddah, Jeddah Islamic Port; 3, The coast of Jazan, near Jazan University; 4, Jazan Fish Market.
FIGURE 1 in Chewing lice (Phthiraptera: Amblycera, Ischnocera) from Red Sea gulls with new host-parasite records
FIGURE 1. Shared colonies of gulls: a, Baltic gull, herring gull and yellow-legged gull; b, Armenian gull, sooty gull and white-eyed Gull.
FIGURE 4. a in Chewing lice (Phthiraptera: Amblycera, Ischnocera) from Red Sea gulls with new host-parasite records
FIGURE 4. a, male genitalia Actornithophilus piceus lari; b, prothorax Austromenopon transversum; c, male genitalia Quadraceps punctatus; d, male genitalia Saemundssonia lari. Prothorax pigmentation: e, Quadraceps punctatus pallidus; f, Quadraceps punctatus clayae; g, Quadraceps punctatus regressus.
Salmon louse infestation levels on sea trout can be predicted from a hydrodynamic lice dispersal model
<p>The abundance of the parasitic salmon louse has increased with the growth in aquaculture of salmonids in open net pens. This represents a threat to wild salmonid populations as well as a key limiting factor for salmon farming. The Norwegian 'traffic light' management system for salmon farming aims to increase aquaculture production while securing sustainable wild salmonid populations. However, this system is at present solely focusing on mortality in wild Atlantic salmon, while responses of sea trout with different ecological characteristics are not included.</p> <p>We analyze lice counts on sea trout from surveillance data and use Bayesian statistical models to relate the observed lice infestations to the environmental lice infestation pressure, salinity, and current speed. These models can be used in risk assessment to predict when and where lice numbers surpass threshold levels for expected serious health effects in wild sea trout.</p> <p>We find that in production areas with the highest density of salmon farms (West coast), more than 50 % of the sea trout experienced lice infestations above levels of expected serious health effects.</p> <p>We also observed high lice infestations on sea trout in areas with salinities below louse tolerance levels, indicating that the fish had been infested elsewhere but were returning to low-saline waters to avoid lice or delouse. This behavioural response may over time disrupt anadromy in sea trout.</p> <p>The observed infestations on sea trout can be explained by the hydrodynamic lice dispersal model, which provides continuous estimates of lice exposure along the whole Norwegian coast. These estimates, which are used in Atlantic salmon research and management, can also be used for sea trout.</p> <p>Synthesis and policy implications: Wild sea trout, spending its entire feeding migration in fjords and coastal areas, is at higher risk than Atlantic salmon to lice infestations from aquaculture. The observed high levels of lice infestation on sea trout question the environmental sustainability of the current aquaculture industry in areas with intensive farming. We discuss the complex responses of sea trout to salmon lice and how the 'traffic light' management system may include data on this species.</p>
Sea lice (Lepeophtherius salmonis) detection and quantification around aquaculture installations using environmental DNA
<p>Here, we present supplementary material form our study<em> Sea lice (Lepeophtherius salmonis) detection and quantification around aquaculture installations using environmental DNA</em>. In our study, we developed and tested a new <em>L. salmonis</em> specific DNA-based assay (qPCR assay) for detection and quantification from seawater samples using an analytical pipeline compatible with the Environmental Sample Processor (ESP) for autonomous water sample analysis of gene targets.</p>
FIGURE 60 in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 60. Caligus turbidus sp. nov., paratype female. A, habitus, dorsal; B, antennule; C, antenna, post-antennal process and maxillule drawn in situ; D, maxilla; E, maxilliped; F, sternal furca; G, leg 1 with minute vestige of seta arrowed. Scale bars: 1.0 mm on A, 100 µm on C–G, 50 µm on B.
FIGURE 61 in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 61. Caligus turbidus sp. nov., paratype female. A, anal somite and caudal rami, ventral view showing spinule patches; B, leg 2; C, leg 3; D, leg 4; E, leg 5. Scale bars 100 µm on A–D, 50 µm on E.
FIGURE 70 in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 70. Lepeophtheirus robertae sp. nov., holotype female. A, brachium of maxilla; B, maxilliped; C, sternal furca; D, leg 1, ventral; E, leg 2, ventral; F, leg 3, ventral; G, endopod of leg 3; H, first exopodal segment of leg 3, I, second exopodal segment of leg 3. Scale bars: 200 µm on A–F, 100 µm on G–I.
FIGURE 69 in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 69. Lepeophtheirus robertae sp. nov., holotype female. A, habitus, dorsal; B, genital complex, incorporating fourth pedigerous somite, and abdomen, ventral; C, antennule; D, antenna, post-antennal process and maxillule drawn in situ. Scale bars: 1.0 mm on A, 0.5 mm on B, 100 µm on C, D.
FIGURE 59. Caligus triabdominalis Byrnes, 1987, female. A in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 59. Caligus triabdominalis Byrnes, 1987, female. A, habitus, dorsal; B, antenna, post-antennal process and maxillule drawn in situ; C, sternal furca; D, endopod of leg 2; E, outer margin spines on exopod of leg 2; F, exopod of leg 3; G, exopod of leg 4. Scale bars: 1.0 mm on A, 100 µm on B, C, 50 µm on D–F, 200 µm on G.
FIGURE 66. Hermilius youngi Kabata, 1964, A in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 66. Hermilius youngi Kabata, 1964, A, habitus, lateral; B, genital complex and abdomen, ventral; C, posterior end of genital complex and abdomen, ventral; D, antenna; E, brachium of maxilla; F, sternal furca; G, rami of leg 3; H, leg 4. Scale bars: 1.0 mm on A, B, 250 µm on C, 100 µm on D, G, 50 µm on E, F, H.
FIGURE 73 in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 73. Pupulina keiri sp. nov. paratype female. A, habitus, dorsal; B, left corner of dorsal cephalothoracic shield, dorsal view showing surface ornamentation; C, genital complex, ventral view with spermatophore attached; D, caudal ramus, ventral; E, antennule and adjacent hook on ventral cephalothoracic surface, drawn in situ; F, antenna and post-antennal process drawn in situ. Scale bars: 1.0 mm on A, 0.5 mm on B, 200 µm on C–F.
FIGURE 57. Caligus sicarius Kabata, 1984, female. A in The sea lice (Copepoda: Caligidae) of Moreton Bay (Queensland, Australia), with descriptions of thirteen new species
FIGURE 57. Caligus sicarius Kabata, 1984, female. A, habitus, dorsal; B, fourth pedigerous somite, genital complex and abdomen, ventral; C, left corner of genital complex showing leg 5, ventral; D, antennule; E, antenna, post-antennal process and maxillule drawn in situ; F, maxilliped. Scale bars: 500 µm on A, B, 100 µm on C–D, 200 µm on E–F.
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Allen Brain Atlas
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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
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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.
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