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https://www.readbyqxmd.com/read/28746553/gill-parasites-of-fish-from-two-estuaries-in-northeastern-brazil-new-hosts-and-geographical-records
#1
Jéssica E S A Golzio, Júlia M Falkenberg, Rayssa C G Praxedes, Anderson S Coutinho, Mylena K Laurindo, André Pessanha, Rubens R Madi, Joana Patrício, Ana L Vendel, Geza T R Souza, Cláudia M Melo, Ana Carolina F Lacerda
Parasites are important components of communities and constitute great part of the biological diversity found in ecosystems, providing valuable information about their hosts and the environment in which they live. However, despite its importance, parasitic diversity is still not well known in some regions of Brazil, especially with respect to fish parasites in the Northeast Region. The present study aims to perform the survey of gill parasites of fish from two tropical estuaries located in northeastern Brazil: Paraíba and Mamanguape rivers...
July 20, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28746370/neogene-proto-caribbean-porcupinefishes-diodontidae
#2
Orangel Aguilera, Guilherme Oliveira Andrade Silva, Ricardo Tadeu Lopes, Alessandra Silveira Machado, Thaís Maria Dos Santos, Gabriela Marques, Thayse Bertucci, Thayanne Aguiar, Jorge Carrillo-Briceño, Felix Rodriguez, Carlos Jaramillo
Fossil Diodontidae in Tropical America consist mostly of isolated and fused beak-like jawbones, and tooth plate batteries. These durophagous fishes are powerful shell-crushing predators on shallow water invertebrate faunas from Neogene tropical carbonate bottom, rocky reefs and surrounding flats. We use an ontogenetic series of high-resolution micro CT of fossil and extant species to recognize external and internal morphologic characters of jaws and tooth plate batteries. We compare similar sizes of jaws and/or tooth-plates from both extant and extinct species...
2017: PloS One
https://www.readbyqxmd.com/read/28737156/thyroid-function-of-steatitis-affected-mozambique-tilapia-oreochromis-mossambicus-from-a-sub-tropical-african-reservoir
#3
J Dabrowski, P Oberholster, J Steyl, G Osthoff, A Hugo, D M Power, J H van Wyk
Thyroid function and nutritional indicators were measured in obese, steatitis-affected Mozambique tilapia Oreochromis mossambicus from Loskop Reservoir (LR), South Africa. Plasma thyroid hormones (especially T3) and thyroid follicle histomorphology revealed high levels of activity in every aspect of the thyroid cascade measured in fish from LR compared to a reference population of steatitis-free fish. Concurrent measurements of nutritional state including plasma lipids, liver lipid content and hepatocyte size showed that fish from LR had significant energy stores indicative of abundant nutritional intake...
July 24, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28733994/seasonal-recruitment-and-survival-strategies-of-palisada-cervicornis-comb-nov-ceramiales-rhodophyta-in-coral-reefs
#4
Ligia Collado-Vides, Alain Duran, Elizabeth Armenis, Valéria Cassano, Deron Burkepile, Andrew A Shantz, Laura Palma, Jhoana Díaz-Larrea, Abel Sentíes, Mutue Toyota Fujii
As marine tropical ecosystems deteriorate and lose biodiversity, their communities are shifting to being dominated by a few species, altering ecosystem's functioning and services. Macroalgae are becoming dominant on coral reefs, and are frequently observed outcompeting corals. Turf algal assemblages are the base of energy flow in these systems and one of the most abundant types of macroalgae on coral reefs, but little is known about their biology and diversity. Through molecular and morphological analyses, we identified the turf-forming species Laurencia cervicornis, and by studying seasonal recruitment and the impact of herbivorous fishes on its abundance, we describe its survival strategy...
July 22, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28729633/threats-to-large-brown-algal-forests-in-temperate-seas-the-overlooked-role-of-native-herbivorous-fish
#5
Fabrizio Gianni, Fabrizio Bartolini, Alexis Pey, Mathieu Laurent, Gustavo M Martins, Laura Airoldi, Luisa Mangialajo
Canopy-forming algae are declining globally due to multiple disturbances. This decline has recently been on the increase due to the spread of some tropical herbivorous fishes. This new phenomenon has drawn attention to the effects of fish herbivory in temperate areas, which have been assumed to be negligible compared to that of invertebrates, such as sea urchins. In this study, the impact of a Mediterranean native herbivorous fish (Sarpa salpa, salema) was assessed on the canopy-forming seaweed Cystoseira amentacea var...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727503/first-freshwater-bothriocephalidean-cestoda-from-tropical-south-america-closely-related-to-african-taxa
#6
Tomáš Scholz, Ricardo Massato Takemoto, Roman Kuchta
Regobothrium microhamulinum n. gen. and n. sp. (Bothriocephalidea: Bothriocephalidae) is proposed to accommodate a new cestode from flatfish Catathyridium jenynsii (Chabanaud, 1922) (Pleuronectiformes: Acharidae; type host) and another 3 freshwater fishes of the orders Characiformes, Cyprinodontiformes and Siluriformes in the Neotropical Region. The new genus is placed in the Bothriocephalidae because it possesses medioventral uterine and mediodorsal genital pores, and a follicular vitellarium. Regobothrium n...
July 20, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28727218/altered-sediment-biota-and-lagoon-habitat-carbonate-dynamics-due-to-sea-cucumber-bioturbation-in-a-high-pco2-environment
#7
Kennedy Wolfe, Francisco Vidal-Ramirez, Sophie Dove, Dione Deaker, Maria Byrne
The effects of global change on biological systems and functioning are already measureable, but how ecological interactions are being altered is poorly understood. Ecosystem resilience is strengthened by ecological functionality, which depends on trophic interactions between key species and resilience generated through biogenic buffering. Climate-driven alterations to coral reef metabolism, structural complexity and biodiversity are well documented, but the feedbacks between ocean change and trophic interactions of non-coral invertebrates are understudied...
July 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28712770/determination-of-trace-metals-and-analysis-of-arsenic-species-in-tropical-marine-fishes-from-spratly-islands
#8
Jingxi Li, Chengjun Sun, Li Zheng, Fenghua Jiang, Shuai Wang, Zhixia Zhuang, Xiaoru Wang
Trace metal contents in 38 species of tropical marine fishes harvested from the Spratly islands of China were determined by microwave digestion and inductively coupled plasma mass spectrometry analysis. Arsenic species were determined by high-performance liquid chromatography and inductively coupled plasma mass spectrometry analysis. The average levels of Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Mo, Cd, Pb, and U in the fish samples were 1.683, 0.350, 0.367, 2.954, 36.615, 0.087, 0.319, 1.566, 21.946, 20...
July 13, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28701471/effects-of-hypoxia-and-ocean-acidification-on-the-upper-thermal-niche-boundaries-of-coral-reef-fishes
#9
Rasmus Ern, Jacob L Johansen, Jodie L Rummer, Andrew J Esbaugh
Rising ocean temperatures are predicted to cause a poleward shift in the distribution of marine fishes occupying the extent of latitudes tolerable within their thermal range boundaries. A prevailing theory suggests that the upper thermal limits of fishes are constrained by hypoxia and ocean acidification. However, some eurythermal fish species do not conform to this theory, and maintain their upper thermal limits in hypoxia. Here we determine if the same is true for stenothermal species. In three coral reef fish species we tested the effect of hypoxia on upper thermal limits, measured as critical thermal maximum (CTmax)...
July 2017: Biology Letters
https://www.readbyqxmd.com/read/28696400/the-epiphytic-genus-gambierdiscus-dinophyceae-in-the-kermadec-islands-and-zealandia-regions-of-the-southwestern-pacific-and-the-associated-risk-of-ciguatera-fish-poisoning
#10
Lesley L Rhodes, Kirsty F Smith, Sam Murray, D Tim Harwood, Tom Trnski, Rex Munday
Species in the genus Gambierdiscus produce ciguatoxins (CTXs) and/or maitotoxins (MTXs), which may cause ciguatera fish poisoning (CFP) in humans if contaminated fish are consumed. Species of Gambierdiscus have previously been isolated from macroalgae at Rangitahua (Raoul Island and North Meyer Islands, northern Kermadec Islands), and the opportunity was taken to sample for Gambierdiscus at the more southerly Macauley Island during an expedition in 2016. Gambierdiscus cells were isolated, cultured, and DNA extracted and sequenced to determine the species present...
July 11, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28692652/developmental-transcriptomic-analyses-for-mechanistic-insights-into-critical-pathways-involved-in-embryogenesis-of-pelagic-mahi-mahi-coryphaena-hippurus
#11
Elvis Genbo Xu, Edward M Mager, Martin Grosell, John D Stieglitz, E Starr Hazard, Gary Hardiman, Daniel Schlenk
Mahi-mahi (Coryphaena hippurus) is a commercially and ecologically important species of fish occurring in tropical and temperate waters worldwide. Understanding early life events is crucial for predicting effects of environmental stress, which is largely restricted by a lack of genetic resources regarding expression of early developmental genes and regulation of pathways. The need for anchoring developmental stages to transcriptional activities is highlighted by increasing evidence on the impacts of recurrent worldwide oil spills in this sensitive species during early development...
2017: PloS One
https://www.readbyqxmd.com/read/28681163/bioaccumulation-of-polychlorinated-biphenyls-pcbs-in-atlantic-sea-bream-archosargus-rhomboidalis-from-kingston-harbour-jamaica
#12
Ann-Tenneil O'Connor, Dwight Robinson, Tara P Dasgupta, Aaron T Fisk, Ken G Drouillard
Multiple sizes of Sea bream were collected from Kingston Harbour, Jamaica, to assess steady state bioaccumulation of polychlorinated biphenyls (PCBs) in a tropical fish. Sea beam fork lengths ranged from 7.3 to 21.5 cm (n = 36 fish) and tissue lipids decreased with body length. Larger fish had lower δ(13)C isotopes compared to smaller fish, suggesting a change in diet. Linear regressions showed no differences in lipid equivalent sum PCB concentrations with size. However, differences in individual congener bioaccumulation trajectories occurred...
July 5, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28680671/on-the-occurrence-of-three-non-native-cichlid-species-including-the-first-record-of-a-feral-population-of-pelmatolapia-tilapia-mariae-boulenger-1899-in-europe
#13
Juliane A Y Lukas, Jonas Jourdan, Gregor Kalinkat, Sebastian Emde, Friedrich Wilhelm Miesen, Hannah Jüngling, Berardino Cocchiararo, David Bierbach
Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids (Amatitlania nigrofasciata) and tilapia (Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the discovery of spotted tilapia (Pelmatolapia mariae) in the Gillbach, the first record of a reproducing population of this species in Europe...
June 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28628614/lamphimerus-a-novel-lamp-assay-for-detecting-amphimerus-sp-dna-in-human-stool-samples
#14
William Cevallos, Pedro Fernández-Soto, Manuel Calvopiña, Cristina Fontecha-Cuenca, Hiromu Sugiyama, Megumi Sato, Julio López Abán, Belén Vicente, Antonio Muro
BACKGROUND: Amphimeriasis is a fish-borne disease caused by the liver fluke Amphimerus spp. that has recently been reported as endemic in the tropical Pacific side of Ecuador with a high prevalence in humans and domestic animals. The diagnosis is based on the stool examination to identify parasite eggs, but it lacks sensitivity. Additionally, the morphology of the eggs may be confounded with other liver and intestinal flukes. No immunological or molecular methods have been developed to date...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28624873/short-communication-first-report-of-nematodes-parasitizing-the-four-eyed-fish-anableps-anableps-pisces-cyprinodontiformes
#15
Juliana Souza Ribeiro, Francisco Carlos Rodrigues de Oliveira, Nicole Brand Ederli
The genus Anableps is composed of species Anableps anableps, Anableps dowi, and Anableps microlepis. These fishes are tropical and usually live on the surface of brackish water, being popularly known as four-eyed-fishes due to the presence of prominent eyes and a pupil split horizontally. A. anableps and A. microlepis are considered as sister species that live in sympatry in South America. A. dowi, however, is restricted to the Pacific Ocean (Central America) and is considered the most primitive species of this genus...
August 2017: Parasitology Research
https://www.readbyqxmd.com/read/28622053/importance-of-sandy-bottoms-in-coral-reefs-to-the-oscillation-of-daily-rhythms-in-the-tropical-wrasse-halichoeres-trimaculatus
#16
Hitomi Ito-Takeuchi, Kai Takahashi, Selma Bouchekioua, Chihiro Yamauchi, Yuki Takeuchi, Sung-Pyo Hur, Young-Don Lee, Akihiro Takemura
Most wrasse species swim during the day and bury themselves in the sandy bottoms of shallow reefs at night. This study aimed to evaluate the importance of sandy bottoms to the day-active/night-inactive rhythmicity of the tropical wrasse Halichoeres trimaculatus. Actogram analysis revealed that fish were active during the photophase and inactive during the scotophase in aquariums with both sandy and bare bottoms. When fish were kept in aquariums with bare bottoms, rhythmicity was maintained under constant dark conditions (DD) but became obscured under constant light conditions (LL), suggesting that a day-active/night-inactive rhythmicity is regulated by the circadian system...
June 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28620218/bioinspired-nanocoatings-for-biofouling-prevention-by-photocatalytic-redox-reactions
#17
Priyanka Sathe, Karthik Laxman, Myo Tay Zar Myint, Sergey Dobretsov, Jutta Richter, Joydeep Dutta
Aquaculture is a billion dollar industry and biofouling of aquaculture installations has heavy economic penalties. The natural antifouling (AF) defence mechanism of some seaweed that inhibits biofouling by production of reactive oxygen species (ROS) inspired us to mimic this process by fabricating ZnO photocatalytic nanocoating. AF activity of fishing nets modified with ZnO nanocoating was compared with uncoated nets (control) and nets painted with copper-based AF paint. One month experiment in tropical waters showed that nanocoatings reduce abundances of microfouling organisms by 3-fold compared to the control and had higher antifouling performance over AF paint...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28616239/reflex-impairment-and-physiology-as-predictors-of-delayed-mortality-in-recreationally-caught-yellowtail-snapper-ocyurus-chrysurus
#18
Francesca C Forrestal, M Danielle McDonald, Georgianna Burress, David J Die
Yellowtail snapper (Ocyurus chrysurus) is an important part of the reef fish assemblage in the western, tropical Atlantic and is caught by both recreational and commercial fisheries in south Florida and the Bahamas. It is estimated that 80% of snapper caught within southeastern Florida waters are discarded due to minimum size restrictions. Neglecting to include information on delayed mortality of undersized fish has the potential for fishery managers to overestimate the abundance of smaller size classes and introduce bias into stock assessments...
2017: Conservation Physiology
https://www.readbyqxmd.com/read/28610158/a-new-i-schistura-i-from-the-salween-basin-in-western-yunnan-teleostei-nemacheilidae
#19
Marco Endruweit
River loaches of the genus Schistura McClelland 1838 are small, elongated, benthic fishes of the family Nemacheilidae. Species in the genus are part of a subsistence fishery in several Southeast Asian countries due to their tasty flesh and relative abundance in suitable habitats. Fluvial environments with gravelly bottoms in tropical and subtropical regions can be co-inhabited by several species of nemacheilid loaches. Kottelat (1990) reported up to six different species coexisting in Indochinese streams in some instances...
March 15, 2017: Zootaxa
https://www.readbyqxmd.com/read/28609892/reappraisal-of-i-synagrops-i-g%C3%A3-nther-1887-with-rehabilitation-and-revision-of-i-parascombrops-i-alcock-1889-including-description-of-seven-new-species-and-two-new-genera-perciformes-acropomatidae
#20
Werner W Schwarzhans, Artem M Prokofiev
An ongoing review of the fishes of the basal percoid family Acropomatidae has revealed that the genus Synagrops Günther, 1887 as it is currently understood is not a natural group. Species with a serrated pelvic-fin spine are here placed in the resurrected genus Parascombrops Alcock, 1889 (type-species: Parascombrops pellucidus Alcock, 1889), and the new, monospecific genus Caraibops n. gen. (type-species: Synagrops trispinosus Mochizuki & Sano, 1984). Parascombrops is unique amongst Acropomatidae in the combination of the presence of vacant 8th interneural space, a predorsal formula /0+0/0+2/ and an epaxialis attachment type 1...
May 4, 2017: Zootaxa
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