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354 results for “elasmobranch”
Data from: Elasmobranch bycatch in the demersal prawn trawl fishery in the Gulf of Papua, Papua New Guinea
The elasmobranch bycatch of the Gulf of Papua Prawn Fishery is investigated in detail for the first time. Fisheries observers collected data on the elasmobranch bycatch from a total of 403 trawl sets (1,273 hrs) in the Gulf of Papua. A total of 40 species of elasmobranchs were recorded ranging in size from a 12 cm disc width stingray to a 350 cm total length sawfish. High mortality rates were recorded (>80%), attributed to the long trawl durations (up to 4 hours). The future inclusion of bycatch reduction devices would likely reduce the number of larger elasmobranchs being caught and is being investigation by the PNG National Fisheries Authority. Differences in catch compositions were detected across the management zones as well as between the two monsoonal seasons (SE Monsoon and NW Monsoon). Increased monitoring and additional research is required and management plans should address the elasmobranch bycatch and in particular their high mortality rate.
FIGURE 7 in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 7. Live specimens of immature praniza larvae after feeding. (A and B) Paratype of Gnathia nubila n. sp. (NSMT-Cr 20880). Dorsal view (A) and ventral view (B) of the same specimen. (C and D) Gnathia grandilaris n. sp. (NSMT-Cr 20882), dorsal view. Scale bars are 1 mm.
FIGURE 4. Gnathia nubila n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 4. Gnathia nubila n. sp, immature praniza larva paratype, 9.3 mm (NSMT-Cr 20880). (A) Body in dorsal view. (B) Cephalosome with pereonite 1 (P1). (C) Pleotelson. (D) Antenna 1. (E) Antenna 2. (F) Mandible. (G) Maxillule. (H) A pair of paragnaths (the second specimen, 8.9 mm, NSMT-Cr 20880) (I) Maxilliped. (J) Gnathopod. (K) Pereopod 2. (L) Pleopod 2.
FIGURE 5. Gnathia grandilaris n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 5. Gnathia grandilaris n. sp., female (NSMT-Cr 20881). (A) Body in dorsal view. (B) Left eye and frontal border. (C) Pleotelson. (D) Antenna 1. (E) Antenna 2. (F) Maxilliped. (G) Pylopod, Su; suture of article 1, Oo; oostegite. (H) Pereopod 2. (I) Pleopod 2.
FIGURE 3. Gnathia nubila n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 3. Gnathia nubila n. sp, female paratype (A–D), 7.6 mm (NSMT-Cr 20879) and the second paratype specimen (E–J), 7.7 mm (NSMT-Cr 20879). (A) Body in dorsal view. (B) Body in lateral view. (C) Left eye and frontal border. (D) Pleotelson. (E) Antenna 1. (F) Antenna 2. (G) Maxilliped. (H) Pylopod, Su; suture of article 1. (I) Pereopod 2. (J) Pleopod 2.
FIGURE 6. Gnathia grandilaris n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 6. Gnathia grandilaris n. sp., male, 10.1 mm (A; NSMT-Cr 20881) and immature praniza larva, 7.6 mm (B, C; NSMT-Cr 20882). (A) Male in dorsal view. (B) Larva in dorsal view. (C) Pleotelson of larva.
FIGURE 2. Gnathia nubila n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 2. Gnathia nubila n. sp, male holotype, 9.1 mm (NSMT-Cr 20878). (A) Maxilliped. (B) Pylopod; 2 areolae are recognizable on the pylopod of the other taxonomic type series. (C) Pereopod 2. (D) Pleopod 2. (E) Penes.
FIGURE 1. Gnathia nubila n in Gnathia nubila n. sp. and a new record of Gnathia grandilaris (Crustacea, Isopoda, Gnathiidae) that parasitizes elasmobranchs from Okinawan coastal waters, Japan
FIGURE 1. Gnathia nubila n. sp, male holotype, 9.1 mm (NSMT-Cr 20878). (A) Body in dorsal view. (B) Eye and mandible in ventral view. (C) Cephalosome in lateral view. (D) Pleotelson. (E) Mandible and frontal border. (F) Antenna 1. (G) Antenna 2.
FIGURE 3 in Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters
FIGURE 3. Gnathia maculosa sp. nov. Praniza larva paratype, 5.5 mm (NSMT-Cr 20426). A, body, left eye and frontal border, dorsal view. B, body in lateral view. C, antenna 1. D, antenna 2. E, gnathopod. F, mandible in lateral view. G, maxillule. H, pair of paragnaths. I, maxilliped. J, pereopod 2. K, pleotelson. L, pleopod 2.
FIGURE 1 in Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters
FIGURE 1. Gnathia maculosa sp. nov. Male holotype, 5.7 mm (NSMT-Cr 20425). A, body in dorsal view. B, mandible and frontal border. C, cephalosome in dorsolateral view. D, cephalosome in ventral view. E, antenna 1. F, antenna 2. G, pylopod. H, maxilliped. I, penes. J, pereopod 2. K, pleotelson. L, pleopod 2.
FIGURE 2 in Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters
FIGURE 2. Gnathia maculosa sp. nov. Female paratype, 4.6 mm (NSMT-Cr 20246). A, body, left eye and frontal border, dorsal view. B, body in lateral view. C, antenna 1. D, antenna 2. E, pylopod. F, maxilliped. G, pereopod 2. H, pleotelson. I, pleopod 2.
FIGURE 4. Gnathia trimaculata. A in Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters
FIGURE 4. Gnathia trimaculata. A, Dorsal view of male (NSMT-Cr 20427; 5.9 mm). B; antenna 2 of male. C, dorsal view of female (NSMT-Cr 20427; 5.6 mm). D, pylopod of female. E, maxilliped of female. F, lateral view of praniza larva (NSMT-Cr 20427; 6.8 mm).
FIGURE 5 in Description of Gnathia maculosa and a new record of Gnathia trimaculata (Crustacea, Isopoda, Gnathiidae), ectoparasites of elasmobranchs from Okinawan coastal waters
FIGURE 5. Live specimens of praniza larvae after feeding. A, paratype of Gnathia maculosa sp. nov. (NSMT-Cr 20426). B and C, Gnathia trimaculata (NSMT-Cr 20427). Scale bars = 1 mm.
FIGURE 4 a–e in Trypanorhynch cestodes of elasmobranchs from the Persian Gulf
FIGURE 4 a–e. Otobothrium sp. a. Scolex. b. Internal surface, basal armature. c. Bothrial surface, basal armature. d. External surface, basal armature. e. Mature segment. Scale bars: a, e, 100; b–d, 10.
FIGURE 2 a–f. Eutetrarhynchus platycephali. a. Scolex. b. External surface, basal armature. c. Internal surface, metabasal armature. d. Bothrial surface, metabasal armature. e. External surface, metabasal armature. f. Mature segment. Fig. 2 g in Trypanorhynch cestodes of elasmobranchs from the Persian Gulf
FIGURE 2 a–f. Eutetrarhynchus platycephali. a. Scolex. b. External surface, basal armature. c. Internal surface, metabasal armature. d. Bothrial surface, metabasal armature. e. External surface, metabasal armature. f. Mature segment. Fig. 2 g. Eutetrarhynchus sp. Scale bars: a, 1000; b–e, 10; f, 500; g, 100.
FIGURE 3 a–d in Trypanorhynch cestodes of elasmobranchs from the Persian Gulf
FIGURE 3 a–d. Nybelinia sp. I from the stomach of R. acutus. a. Scolex. b. Bothrial surface, basal armature. c. Mature segment. Fig. 3 d–g. Nybelinia sp. II from the stomach of Himantura imbricata. d. Scolex. e. Bothrial surface, basal armature. f. Antibothrial surface, basal armature. g. Mature segment. Scale bars: a, c, d, g, 100; b, e, f, 10.
FIGURE 1 a–e. Prochristianella macracantha. a. Scolex. b. Bothrial surface, basal armature. c. External surface, basal armature. d. Internal surface, metabasal armature. e in Trypanorhynch cestodes of elasmobranchs from the Persian Gulf
FIGURE 1 a–e. Prochristianella macracantha. a. Scolex. b. Bothrial surface, basal armature. c. External surface, basal armature. d. Internal surface, metabasal armature. e. Bothrial surface, metabasal armature. Scale bars: a, 100; b–e, 10.
FIGURES 25–30 in Five new species of Acanthobothrium van Beneden, 1849 (Cestoda: Tetraphyllidea) in elasmobranchs from the northwest Atlantic and Gulf of Mexico with first records from smooth-hound sharks and guitarfish
FIGURES 25–30. Acanthobothrium westi sp. nov. from Raja texana. 25. Scolex, note rounded bothridia joined by velum and length of cephalic peduncle. 26. Hooks, note form of lateral hook (left). 27. Hooks, note form of lateral hook (right). 28. Bothridium, note bothridial form and position of septa. 29. Terminal (mature) segment. 30. Detail of ovary. Note overlap of left lobe over right lobe posteriorly. Scale bars: Figs. 25, 29= 100 um. Figs. 26, 27= 35 um. Figs. 28, 30= 50 um.
FIGURES 31–36 in Five new species of Acanthobothrium van Beneden, 1849 (Cestoda: Tetraphyllidea) in elasmobranchs from the northwest Atlantic and Gulf of Mexico with first records from smooth-hound sharks and guitarfish
FIGURES 31–36. New Acanthobothrium species from Gulf of Mexico. 31. A. ulmeri sp. nov., holotype. 32. A. westi sp. nov., holotype. 33. A. westi sp. nov., scolex from specimen 2.24 mm long. 34. A. ulmeri sp. nov., scolex from specimen 1.2 mm long. 35. A. schalli sp. nov. detail of hooks showing elongated tubercles. 36. A. schalli sp. nov., holotype, entire worm with 18 segments. Scale bars: Figs. 31, 32= 250 µm, Figs. 33, 34, 35= 50 µm, Fig. 36.= 500 µm.
FIGURES 20–24 in Five new species of Acanthobothrium van Beneden, 1849 (Cestoda: Tetraphyllidea) in elasmobranchs from the northwest Atlantic and Gulf of Mexico with first records from smooth-hound sharks and guitarfish
FIGURES 20–24. Acanthobothrium ulmeri sp. nov. from the roundel skate, Raja texana. 20. Scolex. Note acuminate bothridia and short cephalic peduncle 21. Hooks showing two variations in form of lateral hook. 22. Terminal segment. 23. Terminal genitalia. Note vaginal constriction. 24. Entire worm. Scale bars: Fig. 20= 100 µm. Fig. 21= 25 µm. Figs. 22, 23= 50 µm. Fig. 24= 250 µm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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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
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