Diseases of Aquatic Organisms

15/11/2024

Management of reproductive disease in aquarium held elasmobranchs is an important, understudied area of elasmobranch medicine. This retrospective case series describes polycystic ovarian disease in cownose rays, Rhinoptera bonasus, across multiple institutions and provides insights into disease diagnosis, pathogenesis, and recommendations for future research into predisposing factors and treatment methods. bit.ly/dao_160_47

15/11/2024

Piscinoodinum sp. is a well-known parasitic dinoflagellate and the causative agent of the diseases freshwater velvet, rust disease, gold dust disease, freshwater oodinium, or pillularis. Here we report for the first time an outbreak associated with epizootics and mortality in freshwater fish from the Andaman Islands, India. bit.ly/dao_160_19

13/09/2024

A new host species for enigmatic marine horsehair worms (Nematomorpha: Nectonema) was found on a dish! We report parasitic nematomorphs in the Tanner crab Chionoecetes bairdi, provide a phylogenetic tree for the worm, and find that a hypothesis of nematomorph–host co-evolution is not supported. bit.ly/dao_159_153

30/08/2024

This study investigates how Ceratothoa carinata, a parasite from the Cymothoidae family, affects the Japanese scad, Decapterus maruadsi. We analyzed both infected and uninfected host fishes, uncovering significant impacts during the breeding season in July. Results show diminished weights and condition factors, potentially reducing reproductive success. bit.ly/dao_159_63

ABSTRACT: All species of the isopod family Cymothoidae are obligate fish parasites, extracting nourishment through hematophagy and tissue consumption. To elucidate the detrimental effects of this parasitic relationship upon the host fish, we examined body length, weight of body, g***d, liver and sto...

01/08/2024

Jakóbik et al. show that the amphibian-killing chytrid Batrachochytrium dendrobatidis is present in western but not eastern or central Ukraine, which are warmer and drier. This corroborates a spatial distribution model and suggests that freshwater habitat in areas with a continental climate provides refugia for chytrid-susceptible amphibian hosts. https://bit.ly/dao_159_15
Wydział Biologii UJ

06/06/2024

Noelker et al. validated glove decontamination methods to prevent cross-contamination and reduce waste in amphibian experiments that involve handling many individuals. https://bit.ly/dao_158_173

29/04/2024

Group B Streptococcus bacteria is dangerous to humans and more deadly to fish. Knowledge of circulating variants and their antimicrobial resistance in Ghanaian aquaculture is very limited. We found only serotype Ia from diseased tilapia, which is notably different from serotype Ib previously identified in 2017, suggesting possible serotype replacement. https://bit.ly/dao_158_27

03/04/2024

A single-celled protist caused mass mortality of the long-spined sea urchin Diadema antillarum in Florida and the Caribbean in 2022; outbreaks continue to be reported elsewhere. Evans et al. identified compounds effective at killing parasites in culture, a critical first step in the development of possible treatments. https://bit.ly/dao_157_107

18/03/2024

Piez et al. developed a high-throughput multiplex quantitative PCR (qPCR) assay for the simultaneous detection of three eastern oyster Crassostrea virginica parasites: Perkinsus marinus, Haplosporidium nelsoni, and Haplosporidium costale. This will allow more rapid and economic diagnosis, helping to manage mortalities in wild and farmed eastern oysters. https://bit.ly/dao_151_111

04/03/2024

A protozoan microparasite infecting the velvet swimming crab Necora puber: Martin et al assess Paramarteilia canceri infections, reporting an overall prevalence of 46% with temporal variation, and confirming the parasite’s presence in the eggs and g***d of an ovigerous female. https://bit.ly/dao_157_61

29/02/2024

A protozoan microparasite infecting the velvet swimming crab Necora puber: Martin et al assess Paramarteilia canceri infections, reporting an overall prevalence of 46% with temporal variation, and confirming the parasite’s presence in the eggs and g***d of an ovigerous female.

ABSTRACT: Sustainable management of crustacean populations requires an understanding of the range of factors affecting different crustacean species. Recently, a high prevalence of a paramyxid parasite, Paramarteilia canceri, was reported in velvet crabs Necora puber in Ireland. Similar parasites hav...

19/12/2023

Goggin, Leung, Byrne et al. (2023) surveyed asteroid seastars for the parasite Orchitophrya stellarum, finding it more widespread than reported but absent from the invasive Asterias amurensis in Australia. Unlike other authors, they found no evidence of a deleterious effect of the parasite on male seastars in the field. https://bit.ly/dao_156_89