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Journal of Fish Biology

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https://www.readbyqxmd.com/read/29882588/temporal-and-spatial-differences-in-smolting-among-oncorhynchus-nerka-populations-throughout-fresh-and-seawater-migration
#1
M C Bassett, D A Patterson, J M Shrimpton
Physiological changes that occur in the spring are preparatory for salmonid smolts to successfully enter seawater, but variation is likely to exist within species with a wide geographic distribution. Whether differences in development of seawater tolerance exist among populations that differ in distance to the ocean, temporally during the spring, or as fish migrate downstream is not known. Juvenile sockeye salmon Oncorhynchus nerka from four regions in the Fraser River catchment, British Columbia, were intercepted to assess physiological differences among populations and at different times during migration to characterize the parr-smolt transformation...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882585/is-the-duration-of-the-smolt-window-related-to-migration-distance-in-coho-salmon-oncorhynchus-kisutch
#2
R A Elsner, J M Shrimpton
Physiological changes during the parr-smolt transformation were investigated in short distance (Chilliwack River) and long-distance (Salmon River) migrating coho salmon Oncorhynchus kisutch populations in British Columbia, Canada. Biochemical and molecular indicators were used to monitor smolt development for fish reared at 10° C throughout the spring. Fish grew well and developed the physical appearance of competent smolts. Both populations exhibited increases in gill Na+ -K+ -ATPase activity (NKA; an important indicator of seawater tolerance) at the same date and the duration of the increase in enzyme activity did not differ between populations...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882352/effect-of-flood-pulses-on-the-trophic-ecology-of-four-piscivorous-fishes-from-the-eastern-amazon
#3
T A P Barbosa, D C O Rosa, B E Soares, C H A Costa, M C Esposito, L F A Montag
This study investigated the effect of hydrological periods on the feeding activity and trophic interactions of four piscivorous fishes from the middle Xingu River, Brazil: pike-characid Boulengerella cuvieri, dogtooth characin Hydrolycus armatus, dogtooth characin Hydrolycus tatauaia and South American silver croaker Plagioscion squamosissimus. Repletion Index (IR %), Alimentary Index (IAi %) and food web properties were calculated for each species. A total of 825 specimens were collected. The IR showed changes in feeding intensity of B...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882293/regional-differences-in-the-feeding-of-the-ambush-predator-neosebastes-pandus-and-comparisons-of-diets-in-the-scorpaenidae-triglidae-and-platycephalidae
#4
C N Greenwell, P G Coulson, J R Tweedley, N R Loneragan
This study provides a comprehensive assessment of the dietary composition of the ambush predator Neosebastes pandus and compares the diets of 49 species from 39 studies of three benthic predatory families in the Scorpaeniformes: Scorpaenidae (20 species), Triglidae (19 species) and Platycephalidae (10 species). A total of 275 N. pandus were collected from the west (Rottnest Island) and south coasts (Esperance) of south-western Australia and the percentage frequency and volumetric contribution of the stomach contents identified...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882278/mice-on-menu-opportunistic-feeding-behaviour-of-the-amazonian-silver-arowana-osteoglossum-bicirrhosum
#5
J T Verba, M Lima de Oliveira Borges, M N Ferreira da Silva, L Costa Pinto, J G Rabello Neto
Two silver arowana, Osteoglossum bicirrhosum, one male (49.5 cm standard length, LS ) and one female (52.5 cm LS ) that had fed on small-eared colilargo or small-eared pygmy rice rat Oligoryzomys microtis, were sampled during the rising water period in the Brazilian Amazon. The identified prey were 6 and 8 cm long and occupied the entire stomachs of both individuals. This opportunistic feeding behaviour appears to be a strategy for this fish to acquire nutrients during times when its usual aquatic prey is dispersed throughout the flooded forest...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882273/female-biased-dimorphism-in-size-and-age-at-maturity-is-reduced-at-higher-latitudes-in-lake-whitefish-coregonus-clupeaformis
#6
Y E Morbey
Female-biased sexual dimorphism in size at maturity is a common pattern observed in freshwater fishes with indeterminate growth, yet can vary in magnitude among populations for reasons that are not well understood. According to sex-specific optimization models, female-biased sexual size dimorphism can evolve due to sexual selection favouring earlier maturation by males, even when sexes are otherwise similar in their growth and mortality regimes. The magnitude of sexual size dimorphism is expected to depend on mortality rate...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882213/migration-and-survival-of-atlantic-salmon-salmo-salar-smolts-in-a-large-natural-lake
#7
R J Kennedy, R Rosell, M Millane, D Doherty, M Allen
An investigation with acoustic telemetry of the passage of Salmo salar smolts through a large natural lake found heavy mortality occurred at the river-to-lake confluences (mean 31. 2 % km-1 ), but was lower in the main body of the lake (mean 2. 4 % km-1 ). Predation was a significant pressure on emigrating smolts as tagged pike Esox lucius aggregated at river-to-lake confluences during the peak of the smolt run. Tagged smolts mainly emmigrated into the lake in the late evening after dusk, possibly as a predator-avoidance behaviour...
June 8, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882375/description-of-a-new-species-of-triplophysa-teleostei-nemacheilidae-from-guizhou-province-china
#8
W J Wu, A Y He, J X Yang, L N Du
A new cave-dwelling fish species Triplophysa guizhouensis is described based on specimens collected from Guizhou, China, in a subterranean system interconnected with the Hongshui River drainage. The species can be distinguished from its congeners by a combination of characters: eyes present; caudal fin with 14 branched rays; inner gill rakers of first gill arch 8-10; posterior chamber of air bladder developed; and body posterior of dorsal fin scaled. A key to species of Triplophysa in the Pearl River basin is provided...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882355/relationships-between-the-spread-of-caulerpa-filiformis-and-fish-communities-on-temperate-rocky-reefs
#9
D J Bradley, W Gladstone, P E Gribben
The previously sub-dominant native marine macrophyte Caulerpa filiformis is now dominant on many sub-tidal rocky reefs in New South Wales (NSW), Australia and is expanding its distribution. As C. filiformis is highly chemically defended and structurally different to co-occurring habitat-forming macrophytes, two key attributes that govern fish assemblages, we hypothesized that fish assemblages, particularly herbivorous fishes, would be different at sites where C. filiformis occurred from where it was previously absent and within sites, fish community structure would be correlated to the cover of C...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882347/histological-development-of-the-long-snouted-seahorse-hippocampus-guttulatus-during-ontogeny
#10
C Ofelio, A O Díaz, G Radaelli, M Planas
The objective of the present study was to describe histological development of the European long-snouted seahorse Hippocampus guttulatus, to increase understanding of the biology and physiology of the species. Most vital organs were present in juveniles by the time of their release from the male's pouch. Digestive tract specialization occurred at 89 effective day-degrees (D°eff ), corresponding to 15 days post partum (dpp), with development of the first intestinal loop and mucosal folding. At 118 D°eff (20 dpp), lipids were being mobilized from the liver and oocytes attained the perinuclear stage...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882328/change-of-strategy-or-always-overlooked-third-recent-record-of-the-beardless-tadpole-goby-benthophiloides-brauneri-from-an-inland-location-far-from-the-coast
#11
A Marta, N Kamenshchik, I Toderas
The present study documents three specimens of Benthophiloides brauneri from the River Dniester. It is one of the rarest freshwater fishes in Europe, living along the western coast of the Black and Asov Seas, but these new records are 200 river km from the coast. We discuss whether the species has recently started to establish inland populations or inland specimens have previously been overlooked. This article is protected by copyright. All rights reserved.
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882275/population-specific-sperm-production-in-european-flounder-platichthys-flesus-adaptation-to-salinity-at-spawning
#12
A Nissling, R Larsson
Marine teleosts inhabiting the brackish Baltic Sea have adapted to the less saline water with activation of spermatozoa at low salinity hypo-osmotic conditions but with shorter longevity and lower swimming speed that affect the fertilization capacity. Aiming to elucidate if the fertilization capacity may be maintained by increasing the number of spermatozoa produced, testis size for the euryhaline flounder Platichthys flesus with external fertilization was assessed along a salinity gradient; with spawning at a salinity of c...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882215/examining-the-link-between-dietary-specialization-and-foraging-modes-of-stream-dwelling-brown-trout-salmo-trutta
#13
J Sánchez-Hernández, F Cobo
The aim of this study was to explore differences in dietary specialization across two foraging modes (benthic v. surface-drift foraging) of stream-dwelling brown trout Salmo trutta. The degree of inter-individual niche variation within each foraging mode was high, but the dietary specialization was maintained between foraging modes. This study supports the view that if aquatic invertebrates are more abundant and accessible than surface prey, the individuals will not specialize on surface prey (surface-drift foraging)...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29882214/interspecific-and-sexual-differences-in-riverine-distribution-of-tropical-eels-anguilla-spp
#14
S Hagihara, J Aoyama, D Limbong, K Tsukamoto
A total of 261 individuals of the four tropical eel species, Anguilla celebesensis, Anguilla marmorata, Anguilla bicolor pacifica and Anguilla interioris, were collected from 12 locations around Sulawesi Island, Indonesia, to gain knowledge about the riverine distribution of tropical eels. Anguilla marmorata was predominant in the lower reaches of Poso River (94·4% of total eel catch in the sampling area), Poso Lake (93·3%), three small inlet rivers of Tomini Bay (100%) and Laa River (92·3%). Anguilla celebesensis occurred frequently in the inlet rivers of Poso Lake (63·5%)...
June 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29873403/diurnal-foraging-of-a-wild-coral-reef-fish-parapercis-australis-in-relation-to-late-summer-temperatures
#15
T J Chase, J P Nowicki, D J Coker
In situ observations of diurnal foraging behaviour of a common site-attached shallow reef mesopredator Parapercis australis during late summer, revealed that although diet composition was unaffected by seawater temperature (range 28.3-32.4° C), feeding strikes and distance moved increased with temperature up to 30.5° C, beyond which they sharply declined, indicative of currently living beyond their thermal optimum. Diel feeding strikes and distance moved were however, tightly linked to ambient temperature as it related to the population's apparent thermal optimum, peaking at times when it was approached (1230 and 1700 hours) and declining up to four fold at times deviating from this...
June 6, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29855056/using-unmanned-aerial-vehicle-uav-surveys-and-image-analysis-in-the-study-of-large-surface-associated-marine-species-a-case-study-on-reef-sharks-carcharhinus-melanopterus-shoaling-behaviour
#16
G Rieucau, J J Kiszka, J C Castillo, J Mourier, K M Boswell, M R Heithaus
A novel image analysis-based technique applied to unmanned aerial vehicle (UAV) survey data is described to detect and locate individual free-ranging sharks within aggregations. The method allows rapid collection of data and quantification of fine-scale swimming and collective patterns of sharks. We demonstrate the usefulness of this technique in a small-scale case study exploring the shoaling tendencies of blacktip reef sharks Carcharhinus melanopterus in a large lagoon within Moorea, French Polynesia. Using our approach, we found that C...
June 1, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29855040/cetopsis-varii-a-new-species-of-whale-catfish-siluriformes-cetopsidae-from-the-meta-basin-colombia
#17
V P Abrahão, M C C de Pinna
Cetopsis varii sp. nov. Cetopsidae (Cetopsinae) is described from the Río Meta basin in eastern Colombia, at middle portions of the Río Orinoco basin. The new species differs from some congeners by a combination of some features: the absence of a humeral spot, presence of eye, conical teeth on vomer and dentary and rounded posterior nares. Various details of body, dorsal and caudal-fin pigmentation along with morphological features distinguish the new species from remaining congeners. The osteology of the new species is investigated through high-resolution X-ray computed tomography...
June 1, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29756341/identifying-sagittal-otoliths-of-mediterranean-sea-gobies-variability-among-phylogenetic-lineages
#18
A Lombarte, M Miletić, M Kovačić, J L Otero-Ferrer, V M Tuset
In this study, we describe and analyse the morphology of the sagitta, the largest otolith, of 25 species of Gobiidae inhabiting the Adriatic and north-western Mediterranean seas. Our goal was to test the usefulness and efficiency of sagittal otoliths for species identification. Our analysis of otolith contours was based on mathematical descriptors called wavelets, which are related to multi-scale decompositions of contours. Two methods of classification were used: an iterative system based on 10 wavelets that searches the Anàlisi de Formes d'Otòlits (AFORO) database and a discriminant method based only on the fifth wavelet...
May 13, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29737020/new-records-of-angular-rough-sharks-oxynotus-centrina-in-the-coastal-waters-of-malta-with-observations-on-post-capture-resilience-and-release-behaviour
#19
L Koehler
One male and one female angular rough sharks Oxynotus centrina were caught south-east of Malta between May and June at a depth of 60-100 m < 5 km from shore. The immature female (total length, LT 565 mm) was landed dead but the male (535 mm LT ) was found alive. This communication presents important biological observations on post-capture recovery and release behaviour of this species.
May 7, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29660139/swimming-performance-of-12-schizothoracinae-species-from-five-rivers
#20
Y Hou, L Cai, X Wang, X Chen, D Zhu, D Johnson, X Shi
A series of stepped velocity tests were carried out in a Brett-type swimming respirometer and the overall range in swimming performance for 12 Schizothoracinae species was measured. The relative critical swimming speed Ucrit and burst speed Uburst decreased with body length, while absolute Ucrit and Uburst increased with body length. Ucrit increased with temperature up to approximately 15° C and then decreased. Species with a high Ucrit also displayed a higher Uburst .
April 16, 2018: Journal of Fish Biology
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