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103 results for “teleost fish”
Figure 1 in Metazoan ectoparasites of two teleost fish, Boops boops (L.) and Mullus barbatus barbatus L. from Algerian coast: diversity, parasitological index and impact of parasitism
Figure 1. - Number of examined specimens per size classes for Boops boops and Mullus barbatus barbatus from Béjaïa, Algeria.
Figure 2 in Metazoan ectoparasites of two teleost fish, Boops boops (L.) and Mullus barbatus barbatus L. from Algerian coast: diversity, parasitological index and impact of parasitism
Figure 2. - Variation of the parasitologic indexes according to the month and the size classes of B. boops (A, B) and M. barbatus barbatus (C, D). P (%): prevalence; Im: mean intensity; A: mean abundance.
Figure 6 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 6. Scales from different body regions of Lates niloticus. (A–H) Regions 1–8; (I) area around anus; (J) lateral line scale. Scale bars: 1 mm.
Figure 5 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 5. Scales from different body regions of Labeo niloticus. (A–H) Regions 1–8; (I) area around anus; (J) lateral line scale. Scale bars: 300 mm.
Figure 7 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 7. Scale details (SEM). (A) Interradial denticles (Barbus arabicus); (B) focus area (Barbus arabicus); (C, D) tubercles (Barbus exolatus); (E, F) interradial denticles (Barbus exolatus); (G) circuli at interradial area without denticles (Labeo niloticus); (H) focus area (Labeo niloticus). Scale bars: 10 mm (A); 200 mm (B); 500 mm (C, D); 20 mm (E–G); 50 mm (H).
Figure 4 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 4. Scales from different body regions of Barbus exolatus. (A–G) Regions 1–7; (H) region 8; (I, J) area around anus; (K) lateral line scale. Scale bars: 1 mm.
Figure 2 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 2. Principal scale fields. (A) Body scale (Lates niloticus); (B) body scale (Barbus exolatus); (C) lateral line scale (Lates niloticus); (D) lateral line scale (Barbus exolatus). AF, anterior field; LF, lateral field; PF, posterior field.
Figure 3 in Comparative morphology of scales of four teleost fishes from Sudan and Yemen
Figure 3. Scales from different body regions of Barbus arabicus. (A–G) Regions 1–7; (H, I) region 8; (J, K) area around anus; (L) lateral line scale. Scale bars: 1 mm.
Figure 8 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 8. Transitional and adult dentitions in Astyanax mexicanus. A, live fish – 65 days post-fertilization (dpf) (16.9 mm total length (TL)) showing premaxilla, with the first multicuspid teeth developing prior to replacing conical predecessors. Scale bar = 100 µm. B, cleared-and-stained fish – 163 dpf (41.8 mm TL). Asterisk indicates maxillary tooth. Scale bar = 1 mm.
Figure 5 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 5. Frequency distributions of tooth heights. Arrows indicate peaks corresponding to tooth replacement events, and to the plateaux in Fig. 3. A, only the single tallest tooth from each dentigerous bone. B, all measured teeth.
Figure 3 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 3. Sections through first (A, one month) and second (B, two months) generation oral teeth in Astyanax mexicanus. Scale bars = 50 µm.
Figure 11 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 11. Differences between successive tooth generations in terms of time (A), increase in fish total length (TL) (B) and increase in tooth height (C).
Figure 12 in Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Figure 12. Multicuspid teeth in Astyanax mexicanus; sections through a 3-month individual. A, functional teeth (FT) and developing replacement tooth (RT) on the dentary (D). Scale bar = 100 µm. B, close-up of functional tooth showing odontoblasts (Od) grouped on the edge of the pulp cavity (PC); the paths of odontoblast process (dentinal tubules) through the dentine is apparent. Scale bar = 50 µm C, close-up of developing tooth germ, showing a single pulp cavity lined with odontoblasts as well as a continuous dentine-predentine junction (black arrows). Scale bar = 50 µm. D, section through another functional tooth, showing the continuous nature of the dentine-predentine junction (black arrows). Scale bar = 50 µm.
Data from: Dynamics of diet-egg transfer of fatty acids in the teleost fish, red drum (Sciaenops ocellatus)
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Data from: More than meets the eye: predator-induced pupil size plasticity in a teleost fish
<p>1. Most animals are visually oriented, and their eyes provide their "window to the world". Eye size correlates positively with visual performance, because larger eyes can house larger pupils that increase photon catch and contrast discrimination, particularly under dim light, which have positive effects on behaviours that enhance fitness, including predator avoidance and foraging.</p> <p>2. Recent studies have linked predation risk to selection for larger eyes and pupils, and such changes should be of importance for the majority of teleost fishes as they have a pupil that is fixed in size (eyes lack a pupillary sphincter muscle) and, hence, do not respond to changes in light conditions.</p> <p>3. Here, we quantify eye and pupil size of individual crucian carp, a common freshwater fish, following controlled manipulations of perceived predation risk (presence/absence). We also tested if crucian carp responded to increased predation risk by shifts in diel activity patterns.</p> <p>4. We found that crucian carp show phenotypic plasticity with regards to pupil size, but not eye size, as pupil size increased when exposed to predators (pike). Predator-exposed crucian carp also shifted from diurnal to nocturnal activity. Using a modelling exercise, we moreover show that the plastically enlarged pupils significantly increase visual range, especially for small objects under dim light conditions.</p> <p>5. Overall, our results provide compelling evidence for predator-induced pupil enlargement resulting in enhanced visual capabilities in a teleost fish. Pupil-size plasticity in combination with the observed shift towards nocturnal activity may allow for efficient foraging also under dark conditions when predation risk from diurnal and visually oriented predators is reduced. The data highlight the powerful role of predation risk for eye development and evolution. 03-Jul-2020</p>
Data from: Is repeatability of metabolic rate influenced by social separation? a test with a teleost fish
<p>Metabolic rates are typically thought to have important influences on fitness and more broadly be relevant to the ecology and evolution of animals. Previous studies demonstrate that metabolic rates are repeatable to a certain extent under constant conditions, but how social conditions influence the repeatability of metabolic rate remains largely unknown. In this study we investigated the repeatability of resting metabolic rate (RMR) in the highly-social crucian carp<i> </i>(<i>Carassius auratus</i>)<i> </i>after being socially separated for different time periods relative to control fish that were not socially separated. We found that RMR was repeatable in fish in the control group, while the repeatability of RMR disappeared quickly (even within 7 d) when fish were exposed to social separation. This study is the first to examine the role of social separation at different time periods on the repeatability of intra-individual physiological variation in fish. <span>We highlight that inter-individual repeatability of metabolic rate can be substantial</span> <span>over time but was eliminated by </span>social separation<span>. </span>The findings <span>indicate that the repeatability of metabolic rate in fish is condition-dependent, and that the change in repeatability of metabolic rate should not be overlooked when considering the ecological and evolutionary effects of </span>environmental change<span>.</span></p>
Data from: Convergent mosaic brain evolution is associated with the evolution of novel electrosensory systems in teleost fishes
<p><span><span><span><span>Brain region size generally scales allometrically with total brain size, but mosaic shifts in brain region size independent of brain size have been found in several lineages and may be related to the evolution of behavioral novelty. African weakly electric fishes (Mormyroidea) evolved a mosaically enlarged cerebellum and hindbrain, yet the relationship to their behaviorally novel electrosensory system remains unclear. We addressed this by studying South American weakly electric fishes (Gymnotiformes) and weakly electric catfishes (<em>Synodontis</em> spp.), which evolved varying aspects of electrosensory systems, independent of mormyroids. If the mormyroid mosaic increases are related to evolving an electrosensory system, we should find similar mosaic shifts in gymnotiforms and <em>Synodontis</em>. Using micro-computed tomography scans, we quantified brain region scaling for multiple electrogenic, electroreceptive, and non-electrosensing species. We found mosaic increases in cerebellum in all three electrogenic lineages relative to non-electric lineages and mosaic increases in torus semicircularis and hindbrain associated with the evolution of electrogenesis and electroreceptor type. These results show that evolving novel electrosensory systems is repeatedly and independently associated with changes in the sizes of individual brain regions independent of brain size, which suggests that selection can impact structural brain composition to favor specific regions involved in novel behaviors.</span></span></span></span></p>
Finotypic plasticity: Predator-induced plasticity in fin size, darkness, and display behaviour in a teleost fish
<p>Fish fins are remarkable devices of propulsion. Fin morphology is intimately linked to locomotor performance, and hence to behaviours that influence fitness, such as foraging and predator avoidance. This foreshadows a connection between fin morphology and variation in predation risk. Yet, whether prey can adjust fin morphology according to changes in perceived risk within their lifetime (a.k.a. predator-induced plasticity) remains elusive. </p> <p>Here, we quantify the structural size of five focal fins in crucian carp (Carassius carassius) following controlled manipulations to perceived predation risk (presence/absence of pike Esox lucius). We also assess if crucian carp respond to increased predation risk by shifts in dorsal fin colouration, and test for differences in how fish actively use their dorsal fins by quantifying the area of the fin displayed in behavioural trials. </p> <p>We find that crucian carp show phenotypic plasticity with regard to fin size as predator-exposed fish consistently have larger fins. Individuals exposed to perceived predation risk also increased dorsal fin darkness and actively displayed a larger area of the fin to potential predators. </p> <p>Our result thus provides compelling evidence for predator-induced fin enlargement, which should result in enhanced escape swimming performance. Moreover, fin-size plasticity may evolve synergistically with fin colouration and display behaviour, and we suggest that the adaptive value of this synergy is to enhance the silhouette of deep-bodied and hard-to-capture prey to deter gape-limited predators prior to an attack. Together, our results provide new perspectives on the role of predation risk for the development and evolution of fins. </p>
Figure 1 in Diversity of trypanorhynch metacestodes in teleost fishes from coral reefs off eastern Australia and New Caledonia
Figure 1. Collection localities off the east coast of Australia and New Caledonia.
Figure 4 in Postmucilage status of teleost fish assemblages in the Sea of Marmara
Figure 4. Average biomass (kg·km–2) of teleost fish assemblages in the Sea of Marmara, Türkiye.
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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.