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2,258 results for “Catfish”
Figure 3 in A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification
Figure 3. Premaxillae in various species of Denticetopsis. Ventral view of left side, anterior facing top. A, D. sauli (ANSP 161432, paratype); B, D. epa (MZUSP 83228). Arrows indicate hypertrophied and horizontally orientated distal teeth. Scale bars = 1 mm.
Figure 7 in A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification
Figure 7. Neurocranium of Cetopsis fimbriata (USNM 257763). Dorsal view. Anterior to top. Part of sphenotic of left side damaged, but drawn to match its counterpart. Scale bar = 1 mm.
Figure 2 in A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification
Figure 2. Dentary teeth in some species of Cetopsis. Mesial view of left side. A, C. coecutiens (MZUSP 23354); B, C. candiru (MZUSP 24688); C, C. coecutiens, juvenile specimen (LACM 43102-3). Scale bars = 1 mm.
Figure 20 in A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification
Figure 20. Weberian apparatus of Denticetopsis macilenta (AMNH 55332). Ventral view. Anterior to top. Scale bar = 1 mm.
Figure 4 in A phylogenetic study of the neotropical catfish family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes), with a new classification
Figure 4. Palatine. Ventral view of right side. A, Cetopsis coecutiens (MZUSP 38765); B, Cetopsidium morenoi (INHS 69416); C, Cetopsis gobioides (MZUSP 38808). Scale bars = 1 mm.
Data from: Seasonality and growth in tropical freshwater ectotherm vertebrates: results from one-year experimentation in the African grey bichir, giraffe catfish, and the West African mud turtle
<p>Growth in ectotherm vertebrates is strongly rhythmed by seasonal variation in environmental parameters. To track the seasonal variation in ancient times in a continental and tropical context, we aim to develop a method based on the use of the growth rate of fossil ectotherm vertebrates (actinopterygians and chelonians) influenced by seasonal environmental fluctuations they experienced in their lifetime. However, the impact of environmental parameters on growth, positive or negative, and its intensity, depends on the taxa considered and data are scarce for tropical species. For one year, an experiment was conducted to better understand the effect of seasonal variation in environmental parameters (food abundance, temperature, and photoperiod) on the somatic growth rate of three species of tropical freshwater ectotherm vertebrates: the fishes <em>Polypterus senegalus</em> and <em>Auchenoglanis occidentalis</em> and the turtle <em>Pelusios castaneus</em>. Mimicking seasonal shifts expected to be experienced by the animals in the wild, the experiment highlighted the preponderant effect of food abundance on the growth rate of those three species. Water temperature variation had a significant effect on the growth rate of <em>Po. senegalus</em> and <em>Pe. castaneus</em>. Moreover, the photoperiod demonstrated no significant effect on the growth of the three species. The duration of application of starvation or cool water conditions, ranging from 1 to 3 months, did not affect the growth rate of the animals. However, <em>Pe. castaneus</em> showed a temporary sensitivity to the return of ad libitum feeding or of warm water, after a period of starvation or cool water, by a period of compensatory growth. Finally, this experiment revealed, in the three species, fluctuations in the growth rate under controlled and constant conditions. This variation, similar to the variation in precipitation and temperature observed in their native environment, could be linked to a strong effect of an internal rhythm controlling somatic growth rate.</p>
Low incidence of sibling cannibalism among brood parasitic cuckoo catfish embryos
<p>Brood parasites have demanding needs of host resources. Brood parasitic offspring are highly competitive and frequently cause the failure of host broods and the survival of a single parasitic offspring. Accordingly, virulent brood parasites lay single eggs in host nests to minimize multiple parasitism and ensuing sibling competition. In the cuckoo catfish (<em>Synodontis multipunctatus</em>), which parasitise mouthbrooding cichlid fishes in Lake Tanganyika, the modes of host and parasite oviposition lead to frequent cases of multiple parasitism. We experimentally tested the prediction that multiple parasitism leads to frequent siblicide. Cuckoo catfish embryos prey upon host offspring to obtain nourishment during their 3-week development in the host buccal cavity and may also consume conspecific siblings. The potential benefits of siblicide in the system are, therefore, twofold: to decrease competition for limited resources (i.e. host brood with rich yolk sacs) and to directly obtain nourishment by consuming rivals. We found that sibling cannibalism indeed provided measurable benefits in terms of increased growth of the cannibals, but sibling cannibalism was rare and typically occurred only when all host offspring had been consumed. This implies that cannibalism in the cuckoo catfish embryos emerges to mitigate starvation rather than eliminate sibling competition. </p>
Lack of host specialization despite selective host use in brood parasitic cuckoo catfish
<p><span>Host-parasite dynamics involves coevolutionary arms races, commonly leading to host specialization. General understanding of evolutionary trajectories of specialization in brood parasites is compromised by restricted focus on bird and insect lineages. We studied host utilization and host specificity in a natural population of the cuckoo catfish (<em>Synodontis multipunctatus</em>) which is an obligate parasite of parental care of mouthbrooding cichlids in Lake Tanganyika. On a sample of 779 host broods from 20 cichlid species, we detected four host species (with prevalence of parasitism of 2-18%). Phylogenetic analysis based on genomic (ddRAD sequencing) and mitochondrial (Dloop) data from cuckoo catfish embryos showed an absence of host-specific lineages, despite former indications of two morphological forms of the cuckoo catfish. This was corroborated by analyses of genetic structure and co-ancestry matrix. All host species were from the tribe Tropheini, maternal mouthbrooders that spawn over a substrate (rather than in open water). Parasitized host individuals carried smaller clutches (as cuckoo catfish prey on cichlid eggs), but did not differ in their body size or habitat use from non-parasitized conspecifics. We conclude that the cuckoo catfish is an intermediate generalist, selecting a subset of available cichlid species as hosts but not forming host-specific lineages. Brood parasitism in the cuckoo catfish arose in a lineage which lacks any parental care and we discuss costs and benefits of host specialization in this species and brood parasites in general.</span></p>
Low incidence of sibling cannibalism among brood parasitic cuckoo catfish embryos
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Data from: Seasonality and growth in tropical freshwater ectotherm vertebrates: results from one-year experimentation in the African grey bichir, giraffe catfish, and the West African mud turtle
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Lack of host specialization despite selective host use in brood parasitic cuckoo catfish
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Figure 1 in Clarias microspilus, a new walking catfish (Teleostei: Clariidae) from northern Sumatra, Indonesia
Figure 1. Collection localities of Clarias microspilus.
Image 2 in Clarias microspilus, a new walking catfish (Teleostei: Clariidae) from northern Sumatra, Indonesia
Image 2. Left pectoral spine of C. microspilus, MZB 8705, paratype, 175.7mm SL.
Figure 6. High-resolution x in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 6. High-resolution x-ray computerized microtomography (HRXCT) of Ernstichthys taquari, MZUSP 125825, holotype, 22.8 mm SL. (a) Dorsal view, (b) lateral view of left side, (c) ventral view. acf: anterior cranial fontanel; ach: anterior ceratohyal; ang: anguloarticular; bp: basipterygium; br: branchiostegal rays; cl: cleithrum; co: coracoid; cv: complex vertebra; den: dentary; ds: dorsal shield element; eap: expanded first anal-fin pterygiophore (= second ventral shield); ehs: expanded hemal spine (= first ventral shield); fr: frontal; hyo: hyomandibula; io1: first infraorbital; iop: interopercle; let: lateral ethmoid; lp: lateral plate element (= expanded lateral-line ossicle); mes: mesethmoid; mnp: middle nuchal plate; mx: maxilla; op: opercle; pa: parasphenoid; pal: palatine; pch: posterior ceratohyal; pfr: pelvic-fin rays; pfs: pectoral-fin spine; pmx: premaxilla; pnp: posterior nuchal plate (= first dorsal shield); pso: parietosupraoccipital; pto: pterotic; pv5: parapophysis of fifth vertebra; qu: quadrate; sc: posttemporosupracleithrum; spo: sphenotic; vh: ventral hypohyal; vs: ventral shield element.
Figure 5. Ernstichthys taquari, MZUSP 125826, paratypes. Left side specimen 20.2 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 5. Ernstichthys taquari, MZUSP 125826, paratypes. Left side specimen 20.2 mm SL: (a) lateral view, (b) dorsal view, (c) ventral view; right side specimen 22.7 mm SL: (d) lateral view, (e) dorsal view, (f) ventral view.
Figure 8 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 8. Water divide between upper Paraguay (black rivers), upper Paraná (blue rivers), and upper Araguaia (white rivers). Gray dash-line represents the Trans-brazilian lineament. Thin yellow dashed line means water divide boundaries between neighbouring basins. Black star shows type locality of Ernstichthys taquari and Paracanthopoma saci.
Figure 1. Paracanthopoma saci, MZUSP 125624 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 1. Paracanthopoma saci, MZUSP 125624, holotype, 19.1 mm SL. Brazil, Mato Grosso do Sul, Alcinópolis, Rio Taquarizinho. (a) Lateral view, (b) Dorsal view of head, (c) Ventral view of head. Photos by V. Reis.
Figure 3 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 3. Distribution map of Ernstichthys spp. (open dots) and Paracanthopoma spp. (black diamonds). Red star indicates type-locality of Ernstichthys taquari and Paracanthopoma saci.
Figure 4 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 4. Ernstichthys taquari, Brazil, Mato Grosso do Sul, Alcinópolis, RioTaquarizinho State, MZUSP 125825, holotype, 22.8 mm SL. (a) Lateral view, (b) dorsal view, (c) ventral view. Photos by V. Reis.
Figure 7 in Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion
Figure 7. Ancestral geographic reconstruction from Aspredinidae using BBM (7A) and S-DIVA (7B) and from the MTSVG clade of Trichomycteridae using S-DIVA (7C) and BBM (7D). Biogeographical regions: A = Amazon-core; B = São Francisco and Eastern Coastal drainages; C = Paraná-Paraguay; D = Trans-Andean. Black arrows indicate biotic dispersal from Amazon-core to Paraná-Paraguay region. See Materials and Methods section for further analytic details.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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