Evidence for generative homology of cerebellum and cerebellum-like structures in an elasmobranch fish based onPax6, Cbln1andGrid2expression

2018 ◽  
Vol 526 (14) ◽  
pp. 2187-2203 ◽  
Author(s):  
Christos Michael Suriano ◽  
David Bodznick
Keyword(s):  
Elasmobranch Fish

Quantitative study of primary sensory neurone populations of three species of elasmobranch fish

1993 ◽  
Vol 334 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Peter J. Snow ◽  
Mark B. Plenderleith ◽  
Layne L. Wright
Keyword(s):  
Quantitative Study ◽  
Sensory Neurone ◽  
Elasmobranch Fish

scholarly journals Thyrocalcitonin Studies in Elasmobranch Fish

1969 ◽  
Vol 4 (1) ◽  
pp. 95-98 ◽  
Author(s):  
G.N. Louw ◽  
P.D. Stahl ◽  
A.D. Kenny
Keyword(s):  
Elasmobranch Fish

scholarly journals Determination of Mercury, Methylmercury and Selenium Concentrations in Elasmobranch Meat: Fish Consumption Safety

2022 ◽  
Vol 19 (2) ◽  
pp. 788
Author(s):  
Arianna Storelli ◽  
Grazia Barone ◽  
Rita Garofalo ◽  
Antonio Busco ◽  
Maria Maddalena Storelli
Keyword(s):  
Total Mercury ◽  
Health Benefit ◽  
Absorption Spectrometry ◽  
Human Consumption ◽  
Apex Predators ◽  
Safety Level ◽  
Italian Market ◽  
Elasmobranch Fish ◽  
Rate Limit

This study measures total mercury (THg), methylmercury (MeHg) and selenium (Se) concentrations in elasmobranch fish from an Italian market with the aim of evaluating the risk-benefit associated with their consumption, using estimated weekly intake (EWI), permissible safety level (MeHgPSL), selenium health benefit value (HBVSe) and monthly consumption rate limit (CRmm) for each species. THg and Se were analysed by atomic absorption spectrometry, while MeHg was determined by HrGc/Ms. THg and MeHg concentrations ranged from 0.61 to 1.25 μg g−1 w.w. and from 0.57 to 0.97 μg g−1 w.w., respectively, whereas Se levels were 0.49–0.65 μg g−1 w.w. In most samples European Community limits for THg were surpassed, while for MeHg none of the fish had levels above the limit adopted by FAO/WHO. EWIs for THg and MeHg in many cases were above the provisional tolerable weekly intakes (PTWIs). MeHgPSL estimate showed that fish should contain approximately 50% of the concentration measured to avoid exceeding the PTWI. Nevertheless, the HBVSe index indicated that solely skates were safe for human consumption (HBVSe = 3.57–6.22). Our results highlight the importance of a constant monitoring of THg and MeHg level in fish, especially in apex predators, to avoid the risk of overexposure for consumers.

Osmotic and volaemic effects on drinking rate in elasmobranch fish

2002 ◽  
Vol 205 (8) ◽  
pp. 1115-1122 ◽  
Author(s):  
W. Gary Anderson ◽  
Y. Takei ◽  
N. Hazon
Keyword(s):  
Sea Water ◽  
Plasma Osmolality ◽  
Fold Increase ◽  
Total Blood Volume ◽  
Elevated Plasma ◽  
Total Blood ◽  
Drinking Rate ◽  
Scyliorhinus Canicula ◽  
Drinking Response ◽  
Elasmobranch Fish

SUMMARYAn increase in drinking rate of two species of marine elasmobranch fish, Scyliorhinus canicula and Triakis scyllia, acclimated to 80% sea water was observed following the introduction of 100 % sea water to experimental tanks. The drinking response in both species was found to be maximal within 6 h, and a significant increase was sustained for up to 24 h in T. scyllia. Plasma osmolality was significantly increased within 6 h following introduction of 100 % sea water, and this increase was principally due to elevated plasma Na+ and Cl- concentrations. Administration of 2 mol l-1 mannitol, 75 % sucrose and vehicle(elasmobranch Ringer) did not induce a significant increase or decrease in the drinking rate of S. canicula. However, injection of 20 % NaCl was found to decrease drinking rate significantly in S. canicula 60 min after administration. Controlled haemorrhage of approximately 5.7 % of total blood volume in S. canicula induced a rapid 36-fold increase in drinking over basal levels. The present study demonstrates a physiological dipsogenesis in response to hypovolaemia in marine elasmobranch fish as part of their overall iso/hyperosmoregulatory strategy.

Acid and alkaline phosphatases in the lymphomyeloid tissues of elasmobranch fish

1978 ◽  
Vol 58 (3) ◽  
pp. 727-730 ◽  
Author(s):  
Ragnar Fänge
Keyword(s):  
Alkaline Phosphatase ◽  
Acid Phosphatase ◽  
High Activity ◽  
Phosphatase Activity ◽  
Acid Phosphatase Activity ◽  
Alkaline Phosphatases ◽  
Large Numbers ◽  
Alkaline Reaction ◽  
Elasmobranch Fish ◽  
Very High

Activities of phosphomonoesterases were measured at acid and at alkaline reaction (pH 4–5 or 9–65) in homogenates of elasmobranch tissues especially lymphomyeloid structures. The animals were dogfish (Scyliorhinus caniculd) and two species of ray (Raja brachyura, R. naevus). Acid phosphatase activity was high in the epigonal tissue, Leydig's organ, the spleen and the thymus. High activity was also found in the pancreas and the kidney, whereas skeletal and cardiac muscle showed low values. The activity of alkaline phosphatase was very high in the kidney and relatively low in other tissues. Ultrasonification of homogenates from the dogfish resulted in increase of acid phosphatase activity but had little effect on alkaline phosphatase activity. The high activity of acid phosphatase in lymphomyeloid tissue may be due to the presence of large numbers of various types of leucocytes.

Wound healing in an elasmobranch fish is not impaired by high‐CO 2 exposure

2020 ◽  
Vol 96 (6) ◽  
pp. 1508-1511
Author(s):  
Ian A. Bouyoucos ◽  
Oliver N. Shipley ◽  
Emily Jones ◽  
Edward J. Brooks ◽  
John W. Mandelman
Keyword(s):  
Wound Healing ◽  
Elasmobranch Fish

OXYTOCIN AS A NEUROHYPOPHYSIAL HORMONE IN THE HOLOCEPHALIAN ELASMOBRANCH FISH, HYDROLAGUS COLLEI

1969 ◽  
Vol 45 (4) ◽  
pp. 597-606 ◽  
Author(s):  
B. T. PICKERING ◽  
H. HELLER
Keyword(s):  
Amino Acid ◽  
Pituitary Gland ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
The Other ◽  
Pharmacological Properties ◽  
Neurohypophysial Hormones ◽  
Elasmobranch Fish

SUMMARY Two peptides with uterotonic activity have been isolated from the pituitary gland of a holocephalian elasmobranch fish: Hydrolagus collei. One of them had an amino acid composition compatible with that of oxytocin itself, and also had the pharmacological properties of this hormone. The other peptide which was present in much smaller amounts was basic by chromatography and had the pharmacological characteristics of [8-arginine]-oxytocin. It was not completely purified because of the small amount available, but its amino acid composition was in accord with that of vasotocin. The implications of the presence of oxytocin in such a primitive fish on the phylogeny, and hence probably the evolution, of neurohypophysial hormones are discussed.

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