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9 results for “Sailfish”
Fig. 3 in Short-term movements and habitat preferences of sailfish, Istiophorus platypterus (Istiophoridae), along the southeast coast of Brazil
Fig. 3. Minimum and maximum daily temperature and depth experienced by sailfish I, II and III. Box-plots represent the depths experienced by tagged sailfish.
Fig. 2 in Short-term movements and habitat preferences of sailfish, Istiophorus platypterus (Istiophoridae), along the southeast coast of Brazil
Fig. 2. Temperature histograms, showing the relative frequency of time spent at temperature for each tagged sailfish individual. Error bars indicates the standard errors around mean values.
Fig. 1 in Short-term movements and habitat preferences of sailfish, Istiophorus platypterus (Istiophoridae), along the southeast coast of Brazil
Fig. 1. Depth histograms, showing relative frequency of time spent at depth for each tagged sailfish. Error bars indicates the standard errors around mean values.
Fig. 4. Most-probable tracks for sailfish I, II in Short-term movements and habitat preferences of sailfish, Istiophorus platypterus (Istiophoridae), along the southeast coast of Brazil
Fig. 4. Most-probable tracks for sailfish I, II, III, and IV fitted with Kalman Filter State-Space Model.
FIGURE 2 in Molecular cytogenetics insights in two pelagic big-game fishes in the Atlantic, the tarpon, Megalops atlanticus (Elopiformes: Megalopidae), and the sailfish, Istiophorus platypterus (Istiophoriformes: Istiophoridae)
FIGURE 2 | Karyotypes of Megalops atlanticus (Megalopidae) and Istiophorus platypterus (Istiophoridae) after Giemsa staining, C-banding and FISH procedures. The small left boxes highlight the Ag-NORs and MM+/DAPI- sites, and the right ones the 18S (red) and 5S (green) rDNA sites. Scale bar = 5 µm.
FIGURE 1 in Molecular cytogenetics insights in two pelagic big-game fishes in the Atlantic, the tarpon, Megalops atlanticus (Elopiformes: Megalopidae), and the sailfish, Istiophorus platypterus (Istiophoriformes: Istiophoridae)
FIGURE 1 | Geographic distribution map of Megalops atlanticus (Megalopidae) and Istiophorus platypterus (Istiophoridae) across the Atlantic ocean. The shaded areas represents the occurrence and the yellow stars represent the collection sites of the species.
Data for: Hunting behavior of a solitary sailfish Istiophorus platypterus and estimated energy gain after prey capture
<p>Foraging behavior and interaction with prey is an integral component of the niche of predators but is inherently difficult to observe for highly mobile animals in the marine environment. Billfish have been described as 'energy speculators', expending a large amount of energy foraging, expecting to offset high costs with periodic high energetic gain. Surface-based group feeding of sailfish, <em>Istiophorus</em> <em>platypterus</em>, is commonly observed, yet sailfish are believed to be solitary roaming predators with high metabolic requirements, suggesting that individual foraging also represents a major component of predator-prey interactions. Here, we use biologging data and video to examine daily activity levels and foraging behavior, estimate metabolic costs, and document a solitary predation event. We estimate a median active metabolic rate of 218.9 ± 70.5 mgO<sub>2</sub> kg<sup>-1</sup> h<sup>-1</sup> which increased to 518.8 ± 586.3 mgO<sub>2</sub> kg<sup>-1</sup> h<sup>-1</sup> during prey pursuit. Assuming a successful predation, we estimate a daily net energy gain of 2.4 MJ (5.1 MJ acquired, 2.7 MJ expended), supporting the energy speculator model. While group hunting may be a common activity used by sailfish to acquire energy, our calculations indicate that opportunistic individual foraging events offer a net energy return that contributes to the fitness of these highly mobile predators. </p>
Data for: Hunting behavior of a solitary sailfish Istiophorus platypterus and estimated energy gain after prey capture
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Data from: Proto-cooperation: group hunting sailfish improve hunting success by alternating attacks on grouping prey
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