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Fig. 2 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 2. Histological sections of P. maculatus testes, in different stages of gonadal maturation, stained with HE. A: Resting with seminiferous tubules closed containing only spermatogonia; B: Initial maturation, with seminiferous tubules containing all spermatogenic lineage cells and a small amount of sperm; C: Advanced maturation/mature, with seminiferous tubules filled with sperm; D: Partially spent, with open seminiferous tubules containing a considerable amount of sperm; E: Caudal region of a partially spent testis with globular acidophilic secretion (circle); F: fully spent, with open seminiferous tubules containing residual sperm in the lumen. * = Sperm; Arrow = Spermatogonia. Scale bars = 20 µm (A), 50 µm (B and F), 100 µm (C-E).
Fig. 4 in The Canal da Piracema at Itaipu Dam as a fish pass system
Fig. 4. Number of individuals of the principal species, according to reproductive strategy by different biotope: LDMI (long-distance migratory species), SNPC (sedentary with no parental care), SPC (sedentary with parental care), SIFE (sedentary with internal fertilization and external development), SIFI (sedentary with internal fertilization and internal development) and UNK (unknown).
Fig. 3 in The Canal da Piracema at Itaipu Dam as a fish pass system
Fig. 3. Ordination (correspondence analysis – CA; Axis 1 – CA1; Axis 2 – CA2) of the samples taken with seining nets, electrofishing, gillnets, and cast nets, at different stations located in the Canal da Piracema (a). Representation of the mean scores by fishing gears in axis 1 (b) and axis 2 (c).
Fig. 2 in The Canal da Piracema at Itaipu Dam as a fish pass system
Fig. 2. Species number by order and family. Dotted lines delimit the families in relation to the orders.
Figure 2 in Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers
Figure 2. – Individual number histograms of each species broken down by size classes (mm) (left chart) and cohort extraction (right chart) downstream of the Grand Carbet River in March. Right chart: red curves are each cohort extracted by the model; green curve is the cumulative individual number in the modelled age groups.
Figure 1 in Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers
Figure 1. – Map of Guadeloupe with the three sampled rivers (bold lines) and study sites: downstream and upstream the water intakes (●) and the first riffle from the mouth of the rivers (Ì).
Figure 7 in Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers
Figure 7. – Individual number histograms of each species broken down by size classes (mm) for the three stations (top chart) and porosity chart of the Moreau River water intake (bottom chart). Bottom chart: dotted black line indicates 50% crossing; dotted grey lines indicate the mean crossing rate for these size classes. The size of the downstream and upstream populations of Macrobrachium faustinum and M. heterochirus are too small and fragmented to be presented.
Figure 4 in Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers
Figure 4. – Individual number histograms of each species broken down by size classes (mm) (left chart) and cohort extraction (right chart) downstream of the Moreau River in June. Right chart: red curves are each cohort extracted by the model; green curve is the cumulative individuals' number in the modelled age groups. No Macrobrachium heterochirus were caught.
Figure 6 in Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers
Figure 6. – Individual number histograms of each species broken down by size classes (mm) for the three stations (top chart) and porosity chart of the Pérou River water intake (bottom chart). Bottom chart: arrow indicates the optimal size at crossing; dotted black line indicates 50% crossing; dotted grey lines indicate the mean crossing rate for these size classes. The size of the downstream and upstream population of Macrobrachium faustinum is too small and fragmented to be presented.
Figure 1 in Dietary comparison of pike-perch, Sander lucioperca (Linnaeus, 1758) and catfish, Silurus glanis Linnaeus, 1758 in Sidi Salem dam reservoir (Tunisia)
Figure 1. – Locations of the sampling stations in Sidi Salem reservoir. S1: Downstream, S2: Oued Zargha, S3: Central station, S4: Upstream.
Fig. 4 in Short-term changes in energy allocation by Hemiodontidae fish after the construction of a large reservoir (Lajeado Dam, Tocantins River)
Fig. 4. Variation in feeding activity (standard residuals, regression between LS x WS), visceral fat storage, body condition (standard residuals, regression between LS x TW) and reproductive effort (GSR) of Hemiodus unimaculatus, before (Pre-1 and 2) and after (Post-1 and 2) the construction of Lajeado Dam.
Fig. 3 in Short-term changes in energy allocation by Hemiodontidae fish after the construction of a large reservoir (Lajeado Dam, Tocantins River)
Fig. 3. Variation in feeding activity (standard residuals, regression between LS x WS), visceral fat storage, body condition (standard residuals, regression between LS x TW) and reproductive effort (GSR) of Hemiodus microlepis, before (Pre-1 and 2) and after (Post-1 and 2) the construction of Lajeado Dam.
Fig. 2 in Short-term changes in energy allocation by Hemiodontidae fish after the construction of a large reservoir (Lajeado Dam, Tocantins River)
Fig. 2. Variation in feeding activity (standard residuals, regression between LS x WS), visceral fat storage, body condition (standard residuals, regression between LS x TW) and reproductive effort (GSR) of Argonectes robertsi, before (Pre-1 and 2) and after (Post-1 and 2) the construction of Lajeado Dam.
Fig. 1 in Short-term changes in energy allocation by Hemiodontidae fish after the construction of a large reservoir (Lajeado Dam, Tocantins River)
Fig. 1. Relative abundance of A. robertsi, H. microlepis, and H. unimaculatus in Pre- and Post-impoundment periods, in sites distributed along the reservoir (combined within zones: Fluvial, Transition, and Lacustrine).
Fig. 3 in Influence of a large dam and importance of an undammed tributary on the reproductive ecology of the threatened fish matrinxã Brycon orthotaenia Günther, 1864 (Characiformes: Bryconidae) in southeastern Brazil
Fig. 3. Histological sections of Brycon orthotaenia testis stained with Hematoxilin-eosin: (a) resting stage with seminiferous tubules cointaining only spermatogonia (S), (b)(c) maturing/mature with seminiferous tubules full of spermatozoa (Z) in acidophilic secretion (arrows) and (d) spent testis with few spermatozoa (Z) in the lumen (L) in acidophilic secretion (arrow). Bar = (a) 30 µm, (b), (d) 70 µm, (c) 80 µm.
Fig. 1 in Influence of a large dam and importance of an undammed tributary on the reproductive ecology of the threatened fish matrinxã Brycon orthotaenia Günther, 1864 (Characiformes: Bryconidae) in southeastern Brazil
Fig. 1. Location of the study sites of the upper rio São Francisco, downstream from the Três Marias Dam, Minas Gerais State (MG), Brazil. Site 1, immediately downstream from the Três Marias Dam and site 2, below the confluence with the rio Abaeté.
Figure 4 in Impact of a large dam on reproduction of a non-migratory teleost species, Acestrorhynchus lacustris (Characiformes: Acestrorhynchidae)
Figure 4. Testis in different maturation stages and respective transversal sections stained by HE. (A) early maturation, (B) advanced maturation/mature, (C) partially spent; Z= spermatozoa; C2= secondary spermatocytes T= spermatids; ST= seminiferous tubules. Scale bars represent A= 100 µm, B= 200 µm and C= 500 µm.
Figure 3 in Impact of a large dam on reproduction of a non-migratory teleost species, Acestrorhynchus lacustris (Characiformes: Acestrorhynchidae)
Figure 3. Ovaries in different maturation stages and the respective transversal sections stained by HE.(A) resting, (B) initial maturation, (C) advanced maturation/mature, (D) partially spawned, (E) totally spawned ovaries, (F) post-ovulatory follicle, (G) yellow body. O1= early perinucleolar follicles; O2= late perinucleolar follicles; O3= pre-vitellogenic follicles; O4= vitellogenic follicles; POF= post-ovulatory follicle; YB= yellow body. Scales bars represent 100 µm.
Figure 2 in Impact of a large dam on reproduction of a non-migratory teleost species, Acestrorhynchus lacustris (Characiformes: Acestrorhynchidae)
Figure 2. Frequency (%) and size classes of vitelogenic follicles (µm) of A. lacustris from fully grown ovaries of A. lacustris. Different bar colours indicate statistically significant differences between the diameter classes (p<0.05).
Figure 1 in Impact of a large dam on reproduction of a non-migratory teleost species, Acestrorhynchus lacustris (Characiformes: Acestrorhynchidae)
Figure 1. Sampling sections of the São Francisco River, downstream from Três Marias Dam. Section 1: immediately downstream the Dam; Section 2: immediately after the confluence with Abaeté River. UTM coordinates.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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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.