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Journal of Fish Biology

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https://www.readbyqxmd.com/read/28815588/the-tooth-the-whole-tooth-and-nothing-but-the-tooth-tooth-shape-and-ontogenetic-shift-dynamics-in-the-white-shark-carcharodon-carcharias
#1
G C A French, M Stürup, S Rizzuto, J H van Wyk, D Edwards, R W Dolan, S P Wintner, A V Towner, W O H Hughes
Results from this study of the white shark Carcharodon carcharias include measurements obtained using a novel photographic method that reveal significant differences between the sexes in the relationship between tooth cuspidity and shark total length, and a novel ontogenetic change in male tooth shape. Males exhibit broader upper first teeth and increased distal inclination of upper third teeth with increasing length, while females do not present a consistent morphological change. Substantial individual variation, with implications for pace of life syndrome, was present in males and tooth polymorphism was suggested in females...
August 17, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28809037/biological-notes-on-the-reef-stingray-urobatis-concentricus-an-endemic-species-of-mexico
#2
N R Ehemann, X A Pérez-Palafox, K Pabón-Aldana, P A Mejía-Falla, A F Navia, V H Cruz-Escalona
This study found that the reef stingray Urobatis concentricus presents a matrotrophic aplacental viviparous reproduction with yolk sac and trophonemata formation. Growth of ovarian follicles occurs asynchronously and continuously with fecundity of three embryos per female. A maximum size of 58·4 cm total length and 37·6 cm disc width was recorded, corresponding to a mature female of 3 or 4 years of age.
August 14, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28804914/interactions-between-manta-birostris-and-sotalia-guianensis-in-a-world-heritage-listed-brazilian-estuary
#3
C Domit, M K Broadhurst, H Bornatowski
During 1442 h of visual observations over 7 years throughout the World Heritage listed Paranaguá estuarine complex, Brazil, seven occurrences of interactions were observed at a single location involving breaching Manta birostris displacing schools of teleosts, which were subsequently preyed upon by Sotalia guianensis. Although the interactions were not definitively categorized as being amensal, commensal or mutual, their restriction to isolated space (adjacent to a protected area) and time (summer) supports previous assertions the area is important to regional productivity and the continuation of protected-area status...
August 13, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28804912/presence-of-the-telescope-fish-mendosoma-lineatum-in-patagonian-waters-a-new-species-in-the-ichthyological-fauna-from-the-south-west-atlantic-ocean
#4
N D Bovcon, P D Cochia, J Ruibal Núñez, M Vucica, D E Figueroa
The presence of the telescope fish Mendosoma lineatum in Patagonian waters of Argentina is reported. Mendosoma lineatum is the second species of the Latridae recorded in the south-west Atlantic Ocean and its presence in Patagonia is an addition to both the ichthyological fauna of the Argentinean Sea and the south-west Atlantic Ocean.
August 13, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28776696/new-species-of-hyphessobrycon-from-the-rio-teles-pires-rio-tapaj%C3%A3-s-basin-brazil-ostariophysi-characiformes
#5
F R Carvalho, F G Cabeceira, L N Carvalho
A new species of Hyphessobrycon from the upper Rio Tapajós basin, in the Tapajós-Juruena ecoregion, is described. Hyphessobrycon pinnistriatus n. sp. is distinguished from its congeners by having a black, oblique stripe extending from the origin of the second branched ray to the distal end of the third branched anal-fin ray, lacking a conspicuous black midlateral stripe on the body, inner premaxillary teeth with up to seven cusps, and fins normally hyaline or with scattered chromatophores. The description of a new species that is restricted to the Tapajós-Juruena ecoregion is consistent with this region being an area of high endemism of freshwater fishes...
August 4, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28776682/vertical-zonation-and-functional-diversity-of-fish-assemblages-revealed-by-rov-videos-at-oil-platforms-in-the-gulf
#6
F Torquato, H M Jensen, P Range, S S Bach, R Ben-Hamadou, E E Sigsgaard, P F Thomsen, P R Møller, R Riera
An assessment of vertical distribution, diel migration, taxonomic and functional diversity of fishes was carried out at offshore platforms in The (Arabian-Iranian-Persian) Gulf. Video footage was recorded at the Al Shaheen oil field between 2007 and 2014 using a remotely operated vehicle (ROV). A total of 12 822 individual fishes, from 83 taxonomic groups were recorded around the platforms. All the species identified are considered native to The Gulf, although Cyclichthys orbicularis and Lutjanus indicus were recorded for the first time in Qatari waters...
August 3, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28776676/consistency-of-elemental-and-isotope-ratio-patterns-across-multiple-scales-from-individual-fish
#7
M E Seeley, W K Logan, B D Walther
Assays of elemental and stable-isotope ratios across growth increments of scales have the potential to provide a non-lethal alternative to otolith chemistry for identifying migration and ontogenetic trophic shifts. A central assumption when employing scales as otolith analogues is that any scale from an individual will provide equivalent information about the chemical history of that fish. This assumption was investigated with multiple scales from wild and captive euryhaline Atlantic tarpon Megalops atlanticus from the north-west Gulf of Mexico...
August 3, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28776674/skeletal-ontogeny-of-the-vertebral-column-and-of-the-fins-in-shi-drum-umbrina-cirrosa-teleostei-perciformes-sciaenidae-a-new-candidate-species-for-aquaculture
#8
M Neofytou, D G Sfakianakis, G Koumoundouros, C C Mylonas, M Kentouri
The osteological development of the vertebral column and fins in shi drum Umbrina cirrosa was studied in order to improve knowledge for its introduction in Mediterranean aquaculture. The osteological development was studied in 171 individuals, of total length (LT ) from 2·7 to 30·2 mm that were reared under the mesocosm technique. Vertebral ontogeny starts at 3·4 and 4·0 mm LT , with the formation of the first cartilaginous neural and haemal arches, and spines, respectively, and is completed with the full attainment of epicentrals (12·5 mm LT )...
August 3, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28770585/life-history-and-initial-assessment-of-fishing-impacts-on-the-by-catch-species-dules-auriga-teleostei-serranidae-in-southern-brazil
#9
A T Rovani, L G Cardoso
The life history of Dules auriga, a small hermaphrodite serranid species inhabiting deep waters and a frequent component of the discarded catch of bottom trawling in southern Brazil, was studied to assess the fishery effects on the stock through the estimation of the remaining spawning-potential ratio. Sampling was conducted throughout a year and included specimens to determine sex, maturity and age. Age was validated by the edge type and marginal-increment analysis. The oldest and the largest individuals were 9 years and 195 mm total length...
August 2, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28758279/life-stage-dependent-responses-to-desiccation-risk-in-the-annual-killifish-nothobranchius-wattersi
#10
A F Grégoir, C Philippe, T Pinceel, J Reniers, E S J Thoré, B Vanschoenwinkel, L Brendonck
To assess whether the annual killifish Nothobranchius wattersi responds plastically to a desiccation risk and whether this response is life stage dependent, life-history traits such as maturation time, fecundity and life span were experimentally measured in N. wattersi that were subjected to a drop in water level either as juveniles, as adults or both as juveniles and adults. Fish that were exposed to simulated pool drying as juveniles did not show changes in reproductive output or life span. Adults reacted by doubling short term egg deposition at the cost of a shorter lifespan...
July 30, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28758219/plerocercoids-of-the-cestode-diphyllobothrium-ditremum-in-brown-trout-salmo-trutta-substantial-increase-in-infection-after-establishment-of-european-minnow-phoxinus-phoxinus
#11
R Borgstrøm, J Trømborg, T O Haugen, B O Rosseland
This study focuses on plerocercoids of the cestode Diphyllobothrium ditremum in brown trout Salmo trutta from the subalpine lake Øvre Heimdalsvatn in south-central Norway. Salmo trutta was the only fish species in this lake until European minnow Phoxinus phoxinus was registered in 1969. The P. phoxinus population increased substantially in the following years. In contrast with the 1969-1972 period, when plerocercoids of D. ditremum were practically absent in S. trutta, there was a high prevalence and intensity of infection in the 2013 S...
July 30, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28758213/observations-of-marine-wildlife-tourism-effects-on-a-non-focal-species
#12
J R Rizzari, J M Semmens, A Fox, C Huveneers
A radio-acoustic positioning system was used to assess the effects of shark cage-diving operators (SCDO) on the fine-scale movements of a non-focal species, the smooth stingray Bathytoshia brevicaudata. The results revealed that the time spent in the array was individually variable, but generally increased when SCDO were present and that the presence of SCDO may have the capacity to elicit changes in the space use of B. brevicaudata. These results indicate that the effects of marine wildlife tourism may extend beyond the focal species of interest...
July 30, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28744972/aggregating-behaviour-social-interactions-and-possible-spawning-in-the-deep-water-fish-coryphaenoides-rupestris
#13
F C Neat
A dense aggregation of the roundnose grenadier Coryphaenoides rupestris was observed with a towed camera at a depth of 1500 m in the Rockall Trough during September. The density of fish was 100 times greater than other sites. Within the aggregation the fish showed directional alignment, rapid swimming actions, mid-water swimming and social interactions similar to those associated with spawning in other Gadiformes.
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28744927/hyphessobrycon-platyodus-teleostei-characiformes-a-new-species-from-the-rio-madeira-basin-brazil-with-comments-on-how-multicuspid-teeth-relate-to-feeding-habits-in-characidae
#14
W M Ohara, V P Abrahão, V C Espíndola
A new species of Hyphessobrycon is described from the Rio Juma, a tributary of the lower Rio Aripuanã-Rio Madeira basin, Amazonas, Brazil. Hyphessobrycon platyodus can be distinguished from its congeners by the: presence of an elongated dorsal fin in adult males, 25-28 branched anal-fin rays and absence of dark blotches from the dorsal fin and caudal peduncle. The presence of multicuspid teeth in species of Characidae and its relation with feeding habits are briefly commented on.
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28744874/protracted-volitional-spawning-of-pinfish-lagodon-rhomboides-and-changes-in-egg-quality-and-fatty-acid-composition-throughout-the-spawning-season
#15
J S Broach, C L Ohs, N E Breen
Spawning performance of pinfish Lagodon rhomboides without use of hormonal aids was monitored over an extended season. Nearly three million eggs were obtained from 75 spawns collected over a 90-day consecutive period from a single population of four brood fish (1M:1F). A mean ± s.d. batch fecundity of 30·27 ± 22·64 eggs g(-1) female was estimated with 98·0 ± 0·06% of the batch composed of floating eggs which were 1·04 ± 0·04 mm in diameter and 85·71 ± 27·59% fertile. Floating eggs successfully hatched 54·65 ± 29·13% of the time which yielded larvae that were 2·59 ± 0·24 mm in length...
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28744868/a-new-diminutive-genus-and-species-of-catfish-from-lake-tanganyika-siluriformes-clariidae
#16
J J Wright
The examination of material representing one of Lake Tanganyika's six previously recognized endemic catfish lineages, has revealed the presence of an additional genus of clariid, described here as Pseudotanganikallabes new genus. This genus is represented by a single species, Pseudotanganikallabes prognatha sp. nov., which is distinguished from all other clariids by its lack of an infraorbital series, the presence of multiple osseous connections between the swim bladder capsules and elements of the neurocranium, the absence of an ethmoid notch, the presence of a very large, egg-shaped occipital fontanelle and the extension of the lower lip beyond the margin of the upper jaw...
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28744861/gonadal-morphogenesis-and-sex-differentiation-in-cultured-ussuri-catfish-tachysurus-ussuriensis
#17
Z J Pan, C K Zhu, H Wang, F J Zhou, X G Qiang
The objective of this study was to investigate the optimal developmental time to perform sex reversal in Ussuri catfish Tachysurus ussuriensis, to develop monosex breeding in aquaculture. Systematic observations of gonadal sex differentiation of P. ussiriensis were conducted. The genital ridge formed at 9 days post fertilization (dpf) and germ cells begin to proliferate at 17 dpf. The ovarian cavity began forming on 21 dpf and completed by 25 dpf while presumptive testis remained quiescent. The primary oocytes were at the chromatin nucleolus stage by 30 dpf, the peri-nucleolus stage by 44 dpf and the cortical alveoli stage by 64 dpf...
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28736927/pituitary-thyroid-axis-development-during-the-larval-juvenile-transition-in-the-pejerrey-odontesthes-bonariensis
#18
T Chalde, L A Miranda
The morphological development of the thyroid gland of pejerrey Odontesthes bonariensis during larval-juvenile transition was studied and related to whole-body concentrations of thyroxine (T4 ) and tri-iodothyronine (T3 ). A complementary (c)DNA fragment of the thyroid-stimulating hormone β-subunit (tshb) was sequenced and transcript levels quantified during this period. Follicles with eosinophilic and T4 -immunoreactive colloids were detected at hatching together with tshb transcript levels and whole-body concentrations of T4 and T3 hormones...
July 23, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28736894/comparative-development-in-moenkhausia-pittieri-and-paracheirodon-innesi-ostariophysi-characiformes-with-comments-on-heterochrony-and-miniaturization-in-the-characidae
#19
M M Ferreira Marinho
Developmental heterochronies between the small-sized Moenkhausia pittieri and the miniature Paracheirodon innesi were determined by describing and comparing external morphological development in both species. Despite being classified as miniature, P. innesi was larger and more developed in the flexion and post-flexion larval stages than M. pittieri. Broader patterns within the Characidae suggest that body size reduction in P. innesi is tied to accelerated development and higher growth rate along with early maturation and precocious cessation of growth, which are characteristic of miniature species...
July 23, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28703307/evidence-of-atlantic-salmon-salmo-salar-fry-movement-between-fresh-water-and-a-brackish-environment
#20
I Taal, M Rohtla, L Saks, R Svirgsden, M Kesler, L Matetski, M Vetemaa
This study reports descent of Atlantic salmon Salmo salar fry from their natal streams to brackish waters of the Baltic Sea and their use of this environment as an alternative rearing habitat before ascending back to freshwater streams. To the authors' knowledge, residency in a brackish environment has not previously been demonstrated in S. salar fry. Recruitment success and evolutionary significance of this alternative life-history strategy are presently not known.
July 13, 2017: Journal of Fish Biology
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