Article
Biology
Ann Kathrin Huylmans, Ariana Macon, Francisco Hontoria, Beatriz Vicoso
Summary: The study found that only a few genes are consistently associated with asexual evolution, suggesting that extensive restructuring of the meiotic machinery may not be necessary. Sex-biased genes in Eurasian Artemia have high rates of expression divergence, but do not show unusual evolutionary patterns after the loss of sexuality.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Physiology
Natascha Wosnick, Renata Daldin Leite, Eloisa Pinheiro Giareta, Danny Morick, Rachel Ann Hauser-Davis
Summary: This study aims to characterize the energy transfer from parental organisms to offspring in Brazilian Guitarfish through the analysis of energy markers in parental fluids. The results indicate that these markers are being made available to the offspring, possibly as complementary sources of energy. This research sheds light on the metabolic dynamics during reproduction stage in Elasmobranchs.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Fisheries
Aaron C. Henderson, Stephan Bruns, Shamsa Al Hameli
Summary: Maternal nutrient provisioning is common in most chondrichthyan species that give live birth. It is especially prominent in Myliobatiformes, where the uterus secretes a nutrient-rich tissue fluid that nourishes the developing embryo. This study describes a deformed and mouthless late-stage Myliobatiformes embryo, indicating that direct oral ingestion of the tissue fluid is not obligatory in these animals.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Ecology
Marco Archetti
Summary: The adaptive value of sexual reproduction is still debated, with asexual reproduction leading to loss of heterozygosity. However, automixis with terminal fusion in some taxa like oribatid mites appears stable, especially when associated with inverted meiosis. This suggests that the loss of complementation is important in the evolution of sexual reproduction.
JOURNAL OF EVOLUTIONARY BIOLOGY
(2022)
Article
Fisheries
Ana Carolina Moya, Francisco Acuna, Maria Constanza Diaz Andrade, Claudio Gustavo Barbeito, Elena Juana Galindez
Summary: The study revealed the complex structure of the oviductal gland in A. platana, with different glycan distributions in the four zones playing important roles in reproductive success. Sperm presence was confirmed, but no sperm storage was found.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Fisheries
Taito Kina, Tetsuya Masuda, Kiyoshi Asahina, Miwa Suzuki
Summary: Uterine milk plays a crucial role in providing nutrition for embryos in various elasmobranch species, with its rich proteins and lipids supporting embryonic growth. Proteins related to nutrition, growth, and immunity were found in uterine milk, along with fatty acids that promote lipid metabolism in embryos. This study suggests that uterine milk may be secreted in elasmobranchs to support rapid and healthy embryonic growth in addition to egg yolks.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Biodiversity Conservation
Hannah J. Verkamp, Gregory Skomal, Megan Winton, James A. Sulikowski
Summary: Studying the concentrations of testosterone and estradiol in muscle biopsies of white sharks can provide insight into their reproductive status. Lower hormone concentrations in adult male white sharks and some female white sharks suggest they may not be actively producing sperm at the time of sample collection.
ENDANGERED SPECIES RESEARCH
(2021)
Article
Fisheries
Niv Froman, Marie-Aude Genain, Guy M. W. Stevens, Gareth P. Pearce
Summary: The ability tovisualise the internal anatomical structures of fish has contributed greatly to fishbiology by providing important information on their reproductive status and body condition. Traditional methods of acquiring such information have involved euthanasia and dissection, which are known to cause stress. However, the development of waterproof, contactless, and portable equipment has allowed for non-invasive ultrasonographic examinations, even in free-swimming individuals. This study validated the use of this equipment on manta and devil ray specimens and demonstrated its reliability in determining the sexual maturity and gestational status of free-swimming reef manta rays.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Fisheries
M. E. Green, S. A. Appleyard, W. T. White, S. R. Tracey, M. R. Heupel, J. R. Ovenden
Summary: This study used a genetic multi-marker approach to investigate the population structure of scalloped hammerheads in the Indo-Pacific. The findings suggest that management of these shark populations will require international and national cooperation.
FISHERIES RESEARCH
(2022)
Article
Environmental Sciences
Cynthia A. Awruch, Justin D. Bell, Jayson M. Semmens, Jeremy M. Lyle
Summary: The endemic Maugean skate in western Tasmania, Australia, faces uncertainties in its main habitats due to anthropogenic impacts. Key life-history parameters such as reproductive information and growth were studied to inform conservation actions. Conservation strategies should focus on reducing human impacts on the environment, particularly river flows and nutrient load associated with hydroelectricity production and salmonid aquaculture to secure the future well-being of this species.
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
(2021)
Article
Agronomy
Gary L. Bennett, John W. Keele, Larry A. Kuehn, Warren M. Snelling, Aaron M. Dickey, Darrell Light, Robert A. Cushman, Tara G. McDaneld
Summary: The study investigated using genomics to measure the prolificacy of bulls in multiple-bull pastures for commercial beef production. Results showed high repeatability of prolificacy, with age-class and scrotal circumference accounting for less than 5% of variation. Simulated estimation using pooled genotypes was accurate.
Article
Ecology
N. R. Ehemann, F. J. Garcia-Rodriguez, J. De La Cruz-Aguero
Summary: This study provides comprehensive information on the morphometry, genetics, taxonomy, and biogeography of Urotrygon rogersi. The taxonomic identification of specimens was conducted, and DNA taxonomy validation was performed using NADH(2) and COI genes. The study also reveals the geographic distribution of U. rogersi and highlights taxonomic misidentifications in ichthyological collections.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Review
Environmental Sciences
Daire Carroll, Jessica Harvey-Carroll
Summary: This review summarizes the impact of light on the activity and physiology of elasmobranchs, emphasizing the potential negative effects of increased artificial light at night on these species.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Food Science & Technology
Zoe Giagkazoglou, Andrew M. Griffiths, Anastasia Imsiridou, Archontia Chatzispyrou, Konstantinos Touloumis, Jake L. Hebb, Dimitra Mylona, Anna K. Malamidou, Evangelia D. Apostolidi, Ioannis E. Batjakas, Chrysoula Gubili
Summary: Despite labeling regulations at local, European and International levels, mislabeling of seafood products and marketing of protected species remain global issues. DNA barcoding is an effective method for detecting fraudulent seafood products. A study in Greece found moderate levels of mislabeling in ray products, with some samples belonging to species with prohibitions on landings and threatened categories of the IUCN Red List.
Article
Environmental Sciences
Xuan Ma, Bingqian Wang, Zhe Li, Xingwang Ding, Ya Wen, Wenqi Shan, Weiyue Hu, Xinru Wang, Yankai Xia
Summary: The study found that GLA primarily affected the sperm epigenome and transcriptome in mice, but had little effect on fertility, testis histology, or semen quality. Further research is needed to understand the male reproductive toxicity of GLA using similar strategies in human sperm.
