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84 results for “Acipenser”
Endurance swimming performance and physiology of juvenile Green Sturgeon (Acipenser medirostris) at different temperatures, CA, 2022
This dataset provides information on the endurance swimming performance and physiological responses of juvenile Green Sturgeon (Acipenser medirostris), reared and tested at the University of California, Davis, in 2022. Fish were acclimated to two temperature treatments (13°C and 18°C) for 14 days prior to swimming trials. Endurance tests were conducted at 47–53 days post-hatch (DPH) in modified swim tunnels at fixed water velocities (25–55 cm s⁻¹) to measure time-to-fatigue (End.min), station-holding behavior (Station_holding), and swimming type (Swim.type). Fish morphometrics (e.g., weight, fork length, total length) were recorded before trials. Post-swim physiological analyses included whole-body measurements of cortisol, glucose, lactate, and protein. Tissue homogenates were processed to determine concentrations normalized to fish weight (e.g., Cortisol_ng_g, Glucose_ug_g, Lactate_ug_g). Standard curves showed high assay linearity (R² > 0.98) and low variability (CV < 10%). This dataset contributes to understanding sturgeon endurance and physiological stress under different environmental conditions, providing insights into their resilience to temperature and flow changes relevant to river management and conservation efforts. Variables include: species, developmental stage (DPH), rearing and trial conditions (tank, temperature, velocity), fish morphometrics (weight, fork length, total length), and physiological metrics (cortisol, protein, glucose, and lactate).
Experimental evaluation of louver guidance efficiency for green sturgeon (Acipenser medirostris), Primary Datasets, 2016-2017
Throughout the world, louver-bypass systems are a common method for fish protection at water diversion sites. This study used controlled laboratory experiments to quantify louver efficiency for juvenile green sturgeon under a range of conditions. Green sturgeon juveniles used in the study were spawned from the University of California, Davis (hereafter UC Davis) captive broodstock program. Experimental trials were conducted within an indoor flume at the J. Amorocho Hydraulics Laboratory (JAHL) at UC Davis. The flume had a zero degree bed slop, and was equipped with a louver placed at a 15-degree angle to the streamwise flow. Louver slats had 25-mm clear spacing. The louver terminated at a bypass channel 0.3 m wide, and was operated to maintain water velocity in the bypass that was 1.2 times greater than the velocity in the flume. Full factorial experimental treatments were designed to address the influence of sturgeon size, water velocity, diel period, and water temperature on louver performance and behavior. Sturgeon were tested within three predefined size classes (range: 6 – 34 cm TL). At each size class, fish were tested under combinations of water velocity, water temperature, and photophase. During each experimental trial, 60 (+/-2) juvenile sturgeon were released from an acclimation chamber to enter the test area at the bottom of the flume. Fish were allowed to freely navigate throughout the test area until they were transported through the louver slats or bypass channel, at which point they were removed and the time was recorded. Trials ended when all fish were collected at a downstream endpoint, or after 90 minutes of exposure time, and remaining fish were removed from the flume. Trials were completed across two study years within seven months after hatch, following the same protocols with a few minor adjustments in year two. During daytime trials in both study years the louver face was monitored with video recordings to observe contact between fish and the
Figure 1 in Review of sterlet (Acipenser ruthenus L. 1758) (Actinopterygii: Acipenseridae) feeding habits in the River Danube, 1694-852 river km
Figure 1. Map with nine locations along the River Danube (1694–852 river km) where sterlet diet was analysed.
Fig. 3 in Morphofunctional Adaption Of The Renal Tissue Of Acipenser Ruthenus (Actinopterygii, Acipenseriformes) Under Transformed Habitation Conditions
Fig. 3. Degenerative changes in the renal corpuscles of the sterlet's mesonephros. Ehrlich's hematoxylin, Hart's fuchselin. ×100.
Fig. 4 in Morphofunctional Adaption Of The Renal Tissue Of Acipenser Ruthenus (Actinopterygii, Acipenseriformes) Under Transformed Habitation Conditions
Fig. 4. Necrosis of the renal corpuscle of the sterlet's mesonephros. Ehrlich's hematoxylin, Hart's fuchselin. ×70.
Fig. 5 in Morphofunctional Adaption Of The Renal Tissue Of Acipenser Ruthenus (Actinopterygii, Acipenseriformes) Under Transformed Habitation Conditions
Fig. 5. The total sterlet's mesonephrolysis. Ehrlich's hematoxylin, Hart's fuchselin. ×100. Рис. 5. Тотальное разрушение мезонефроса стерляди. Гематоксилин Эрлиха, фукселин Харта. ×100.
Fig. 2 in Morphofunctional Adaption Of The Renal Tissue Of Acipenser Ruthenus (Actinopterygii, Acipenseriformes) Under Transformed Habitation Conditions
Fig. 2. Changes in the histological structure of the proximal nephron of the sterlet's mesonephros. Ehrlich's hematoxylin, Hart's fuchselin. ×200.
Fig. 1 in Morphofunctional Adaption Of The Renal Tissue Of Acipenser Ruthenus (Actinopterygii, Acipenseriformes) Under Transformed Habitation Conditions
Fig. 1. The normal structure of the sterlet's mesonephros. Ehrlich's hematoxylin, Hart's fuchselin. ×200.
Fig. 3 in External Sex Specific Signs In The Structure Of Derivatives Of Sterlet (Acipenser Ruthenus, Linnaeus, 1758) Corium
Fig. 3. Typical dorsal scutes of males (upper) and females (lower) sterlet larvae. Age - 3 months. The average length is 70.3 ± 3.6 mm.
Fig. 1 in External Sex Specific Signs In The Structure Of Derivatives Of Sterlet (Acipenser Ruthenus, Linnaeus, 1758) Corium
Fig. 1. Typical contours of dorsal scutes of males (upper) and females (lower) of adult sterlet. Age - 3 years. The second stage of gonad maturity. The average length is 61.2 ± 1.3 cm.
Figure 3 in Detailed analysis of beluga sturgeon (Huso huso) and stellate sturgeon (Acipenser stellatus) migration in the Lower Danube River
Figure 3. Recorded upstream (u/s) and downstream (d/s) movement preference in different depth frequencies for Beluga sturgeon at rkm 71 and rkm 200 stations.
Figure 2 in Detailed analysis of beluga sturgeon (Huso huso) and stellate sturgeon (Acipenser stellatus) migration in the Lower Danube River
Figure 2. Recorded upstream (u/s) and downstream (d/s) movement preference in different depth frequencies for Beluga sturgeon at rkm 71 and rkm 847 stations.
Figure 28. - Dorsal scutes. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 28. - Dorsal scutes. A: Complete dorsal scute row and dorsal fin fulcrum from a modern A. sturio (NHM 2015.2.18.1, 160.5 cm); B: Archaeological dorsal scutes; C: Possible measurements on the dorsal scutes for size reconstruction: M1: B-D; M2: F = A-C; M3: A = F-E; M4: B-E; M5: B-C; M6: B-F = A; M7: D-E; M8: D-C; M9: D-F = A. Scale bars: A = 10 cm; B = 1 cm.
Figure 31. - Alveolar ornamentation type. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 31. - Alveolar ornamentation type. A: Alveolar pattern with tubercular characteristics at the edge in A. oxyrinchus (NRM 60821, 4th dorsal scute, 99 cm TL); B: Alveolar pattern in a large A. oxyrinchus (MHNNZ 19558, 6th left lateral scute, 276 cm TL); C: Lacrimale-suborbitale from Trigla lucerna (RBINS 23663; 47.5 cm SL). Note the alveolar-like ornamentation. Scale bars = 1 cm.
Figure 20 in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 20. - Isolated elements of the branchial arches or the hyoid (with the exclusion of the hyomandibula). A: Modern A. oxyrinchus (RBINS 24792); B: Archaeological remains of the hyoid or branchial arches. Scale bars = 1 cm.
Figure 27. - Lateral scutes. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 27. - Lateral scutes. A: Complete right lateral row from a modern A. sturio (NHM 2015.2.18.1, 160.5 cm TL); B: Archaeological right lateral scutes from the back of the row; C, D: Right and left lateral scute from the front or middle of the row; E: Right lateral scute with the possible measurements for size reconstruction: M1: B-D; M2: F-C; M3: A-E; M4: B-E; M5: B-C; M6: B-F (caudal edge of the dorsal part); M7: D-E; M8: D-C; M9: D-F (caudal edge of the ventral part). Arrow 1: caudal point; arrow 2: frontal edge of the ridge; Arrow 3: dorsally pointed thickened fold. Scale bars: A = 10 cm; B, C, D = 1 cm.
Figure 19. - Hyomandibula. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 19. - Hyomandibula. A: Hyomandibula from A. oxyrinchus (RBINS 24792), lateral view and perpendicular view of the proximal end; B: Archaeological hyomandibula, lateral view and perpendicular view of the distal and proximal end (latter two not to scale). Note the shape differences between the distal, triangular end and the proximal, oval, squatted ends of the bone. Scale bars = 1 cm.
Figure 30 in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 30. - Scutes behind the dorsal fin of A. oxyrinchus (NRM 35438; 154 cm TL). Scale bar = 1 cm.
Figure 15. - Dermopalatine. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 15. - Dermopalatine. A: Dorsal and ventral view of left dermopalatine from A. oxyrinchus (RBINS 24792); B: Dorsal and ventral view of an archaeological right dermopalatine from A. oxyrinchus; C: Dorsal and ventral view of an archaeological right dermopalatine from A. sturio; D: Measurements on the dermopalatine as defined by Desse-Berset (2011b). Arrows: fossa. Scale bars = 1 cm.
Figure 17. - Dentary. A in Guide for the identification of archaeological sea sturgeon (Acipenser sturio and A. oxyrinchus) remains
Figure 17. - Dentary. A: Ventral and dorsal view of the left dentary from A. oxyrinchus (RBINS 24792); B: Left archaeological dentary of A. oxyrinchus, ventral and dorsal view; C: Ventral and dorsal view of the left dentary from A. sturio and A. oxyrinchus, redrawn from Desse-Berset (2011b); D: Measurements on the dentary as defined by Desse-Berset (1994, 2011b). Arrow 1: medial ridge; Arrow 2: processus. Scale bars = 1 cm.
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