Osteichthyes

Frasca, Salvatore; Wolf, Jeffrey C.; Kinsel, Michael J.; Camus, Alvin C.; Lombardini, Eric

doi:10.1016/b978-0-12-805306-5.00039-0

Cited by 9 publications

(16 citation statements)

References 259 publications

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“…The endomeninx serves as the blood–brain barrier and is composed of three histologically distinct layers. The three species examined here had a meningeal structure consistent with previous descriptions 19,24,26 . In MRI, the ventricular fluid space caudal to the cerebellum appeared distended and more convex than histologic specimens presented in a prior review 14 .…”

Section: Discussionsupporting

confidence: 78%

“…This substance, previously referred to as extradural fluid 14 and perimeningeal fluid 15–17 , has also been called meningeal matrix fluid (MMF) 18 , and this last terminology will be used by the authors. Anatomically, the MMF is located between the ectomeninx, considered a counterpart of the mammalian dura mater 17 , which closely follows the inner surface of the cranial cavity, and the endomeninx, which is closely associated with the brain surface 19 . Much remains unknown about the exact chemical make‐up of fish MMF; however, a mixture of adipose tissue, proteinaceous fluid and lymphomyeloid cells has been described within the compartment between the two meninx layers 14,20–22 …”

Section: Introductionmentioning

confidence: 99%

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MRI of the live fish brain at 3 Tesla: Feasibility, technique and interspecies anatomic variations

Clark¹,

Camus

Comolli

et al. 2022

Vet Radiology Ultrasound

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Advances in aquatic animal medicine and continued growth of the fish hobbyist and aquaculture communities have led to a developing interest in antemortem diagnostic imaging of aquatic species. The aims of this prospective, pilot study were to determine whether advanced neuroimaging can be safely achieved in live fish using clinically available equipment, to optimize imaging parameters, and to develop a comparative MRI atlas of a few fish species of economic or research value. Two each of channel catfish (Ictalurus punctatus), koi (Cyprinus rubrofuscus), and grass carp (Ctenopharyngodon idella) of at least 30 cm in length were individually anesthetized for 3 Tesla (3T) magnetic resonance imaging (MRI) of the brain. All fish achieved an adequate anesthetic level for prolonged immobilization during imaging. Diagnostic quality images were obtained for all subjects; however, the spatial resolution was maximized with larger fish. Imaging protocols were optimized for standard neuroimaging sequences. Additionally, inversion times for fluid-attenuation inversion recovery (FLAIR) sequences were adapted to the naturally high protein content of fish pericerebral fluid. Following imaging, the fish successfully recovered from anesthesia, were humanely euthanized, and were immediately processed to assess brain histopathology. Necropsy confirmed the sex and health status of each fish. A limited comparative MRI atlas was created of the brains of these species for clinical reference. Findings from the current study supported the use of 3T MRI as an adjunct diagnostic test for fish with suspected neurologic disease and provided a limited anatomic atlas of the teleost brain for use as a reference.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

MRI of the live fish brain at 3 Tesla: Feasibility, technique and interspecies anatomic variations

Clark¹,

Camus

Comolli

et al. 2022

Vet Radiology Ultrasound

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“…In fish injected with microcapsules, such changes were sporadic and could not significantly affect the respiration of the fish, especially considering regenerative capabilities of gill tissue ( Wolf et al, 2015 ). Also, many authors report that such violations are often artifacts, a consequence of mechanical damage to tissue during the cutting of histological sections ( Frasca et al, 2018 ; Wolf et al, 2015 ).…”

Section: Resultsmentioning

confidence: 99%

Histopathological analysis of zebrafish after introduction of non-biodegradable polyelectrolyte microcapsules into the circulatory system

Borvinskaya

Gurkov

Shchapova

et al. 2021

PeerJ

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Polyelectrolyte microcapsules are among the most promising carriers of various sensing substances for their application inside the bloodstream of vertebrates. The long-term effects of biodegradable microcapsules in mammals are relatively well studied, but this is not the case for non-biodegradable microcapsules, which may be even more generally applicable for physiological measurements. In the current study, we introduced non-biodegradable polyelectrolyte microcapsules coated with polyethylene glycol (PMs-PEG) into the circulatory system of zebrafish to assess their long-term effects on fish internal organs with histopathologic analysis. Implantation of PMs-PEG was not associated with the formation of microclots or thrombi in thin capillaries; thus, the applied microcapsules had a low aggregation capacity. The progression of the immune response to the implant depended on the time and the abundance of microparticles in the tissues. We showed that inflammation originated from recognition and internalization of PMs-PEG by phagocytes. These microcapsule-filled immune cells have been found to migrate through the intestinal wall into the lumen, demonstrating a possible mechanism for partial microparticle elimination from fish. The observed tissue immune response to PMs-PEG was local, without a systemic effect on the fish morphology. The most pronounced chronic severe inflammatory reaction was observed near the injection site in renal parenchyma and within the abdominal cavity since PMs-PEG were administered with kidney injection. Blood clots and granulomatosis were noted at the injection site but were not found in the kidneys outside the injection site. Single microcapsules brought by blood into distal organs did not have a noticeable effect on the surrounding tissues. The severity of noted pathologies of the gills was insufficient to affect respiration. No statistically significant alterations in hepatic morphology were revealed after PMs-PEG introduction into fish body. Overall, our data demonstrate that despite they are immunogenic, non-biodegradable PMs-PEG have low potential to cause systemic effects if applied in the minimal amount necessary for detection of fluorescent signal from the microcapsules.

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“…Since then, several reports of NGD have followed, associated with different species of amoeba (Dyková et al, 2010; Dykova & Tyml, 2016). Additional findings include lamellar adhesions (synechia), which may form lacunar pseudocysts with amoebic trophozoites within (Frasca et al, 2018; Padrós & Constenla, 2021) and necrosis (Quaglio et al, 2016). In contrast to AGD, spongiosis of the epithelial cells (Padrós & Constenla, 2021; Quaglio et al, 2016) and inflammatory infiltrate have also been reported to be associated with NGD (Daoust & Ferguson, 1985; Quaglio et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Amoeba species colonizing the gills of rainbow trout (Oncorhynchus mykiss) in Swiss aquaculture

Vannetti,

Wynne,

English

et al. 2023

Journal of Fish Diseases

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Nodular gill disease (NGD) is an infectious condition characterized by proliferative gill lesions leading to respiratory problems, oxygen deficiency and mortality in fish. Globally, NGD primarily impacts freshwater salmonids in intensive aquaculture systems. In recent years, numerous outbreaks of severe gill disease have affected more than half of the larger rainbow trout (Oncorhynchus mykiss) farms in Switzerland, mainly during spring and early summer. Mortality has reached up to 50% in cases where no treatment was administered. Freshwater amoeba are the presumed aetiologic agent of NGD. The gross gill score (GS) categorising severity of gill pathology is a valuable first‐line diagnostic tool aiding fish farmers in identifying and quantifying amoebic gill disease (AGD) in farmed marine salmonids. In this study, the GS was adapted to the NGD outbreak in farmed trout in Switzerland. In addition to scoring disease severity, gill swabs from NGD‐affected rainbow trout were sampled and amoeba were cultured from these swabs. Morphologic and molecular methods identified six amoeba strains: Cochliopodium sp., Naegleria sp., Vannella sp., Ripella sp., Saccamoeba sp. and Mycamoeba sp. However, the importance of the different amoeba species for the onset and progression of NGD still has to be evaluated. This paper presents the first description of NGD with associated amoeba infection in farmed rainbow trout in Switzerland.

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Osteichthyes

Cited by 9 publications

References 259 publications

MRI of the live fish brain at 3 Tesla: Feasibility, technique and interspecies anatomic variations

MRI of the live fish brain at 3 Tesla: Feasibility, technique and interspecies anatomic variations

Histopathological analysis of zebrafish after introduction of non-biodegradable polyelectrolyte microcapsules into the circulatory system

Amoeba species colonizing the gills of rainbow trout (Oncorhynchus mykiss) in Swiss aquaculture

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