The effect of mammalian calcitonin on the plasma levels of calcium and inorganic phosphate in the European eel (Anguilla anguilla L.)

SUMMARY A method for the study of renal function and measurement of mean ventral and dorsal aortic blood pressure for the freshwater and seawater-adapted eel, and during transfer of the animal from fresh water to sea-water, is described. Freshwater eels have higher resting blood pressure, p-aminohippuric acid (PAH) and inulin clearance rates and urine flow than seawater eels. Urine from freshwater animals has low Na, K, Ca, Mg and Cl concentrations, while the clearance rate of inorganic phosphate exceeded that of inulin. Urine from seawater animals has high Na, Ca, Mg and Cl concentrations while that of inorganic phosphate was low. Clearance rates for Ca and Mg greatly exceeded those of inulin. During transfer from fresh water to sea-water there was an initial fluctuation in blood pressure, urine flow and PAH and inulin clearance rates which lasted about 2 hr. Thereafter these gradually declined to values observed for the seawater-adapted animal. The significance of PAH and inulin clearance rates in the study of renal function in the eel and in teleosts in general is discussed.

Download Full-text

REGULATION AND DISTRIBUTION OF PLASMA CALCIUM AND INORGANIC PHOSPHATE IN THE EUROPEAN EEL (ANGUILLA ANGUILLA L.)

Journal of Endocrinology ◽

10.1677/joe.0.0420109 ◽

1968 ◽

Vol 42 (1) ◽

pp. 109-117 ◽

Cited By ~ 33

Author(s):

D. K. O. CHAN ◽

I. CHESTER JONES

Keyword(s):

Inorganic Phosphate ◽

Calcium Concentration ◽

Anguilla Anguilla ◽

European Eel ◽

Total Calcium ◽

Corpuscles Of Stannius ◽

Freshwater Eel ◽

Ionic Calcium ◽

Relationship Of ◽

The Relationship

SUMMARY The amounts of ionized, complexed and protein-bound calcium and total inorganic phosphate were measured in the plasma of the eel. Groups comprised freshwater, seawater and distilled water eels; treatment with corticotrophin (ACTH), cortisol, aldosterone or oestrogen; adrenalectomized and hypophysectomized eels and those with the corpuscles of Stannius removed. In the intact animal, the amounts of ultrafiltrable and ionic calcium and inorganic phosphate in the plasma were very constant despite wide variation in the electrolyte composition of the external medium. In the freshwater eel, 1 week after removal of the corpuscles of Stannius, there was a rise in the level of ultrafiltrable calcium and a decline in that of inorganic phosphate. At 3 weeks after operation, although total calcium concentration remained elevated, ultrafiltrable and ionic calcium concentrations returned to control values. Adrenalectomy and hypophysectomy of the freshwater eel resulted in a decline in total calcium concentration with change in the levels of ultrafiltrable calcium or inorganic phosphate. In the seawater eel, adrenalectomy or removal of the corpuscles of Stannius resulted in an increase in total and ultrafiltrable calcium concentrations. Injection of ACTH, cortisol or aldosterone did not affect calcium concentrations but gave a slight decline in inorganic phosphate levels. Injection of oestrogen increased total calcium concentration without affecting ultrafiltrable or ionic calcium concentrations. The relationship of the amounts of ultrafiltrable calcium and inorganic phosphate to the solubility product [ultrafiltrable calcium] × [phosphate] is discussed and attention drawn to the importance of protein-binding in calcium homeostasis.

Download Full-text

An enhanced humoral immune response against the swimbladder nematode, Anguillicola crassus, in the Japanese eel, Anguilla japonica, compared with the European eel, A. anguilla

Journal of Helminthology ◽

10.1017/s0022149x99000359 ◽

1999 ◽

Vol 73 (3) ◽

pp. 227-232 ◽

Cited By ~ 24

Author(s):

M.E. Nielsen

Keyword(s):

Immune Response ◽

Humoral Immune Response ◽

Plasma Levels ◽

Anguilla Anguilla ◽

Anguilla Japonica ◽

Control Fish ◽

European Eel ◽

Lower Plasma ◽

Humoral Immune ◽

Anguillicola Crassus

The humoral immune response in the two eel species, Anguilla japonica and Anguilla anguilla against two fractions of antigens in Anguillicola crassus were studied.Within species, both eel species showed significantly elevated titres compared with controls when immunized with antigens from Anguillicola crassus.In interspecific comparison, Anguilla japonicashowed significantly elevated titres in comparison with Anguilla anguilla. Immunization of Anguilla anguillacaused a significantly decrease in the plasma levels of protein in comparison with control fish and all groups of Anguilla japonica. In contrast, Anguilla japonica showed significantly lower plasma levels of Ig in all groups compared with Anguilla anguilla.The different susceptibilities to Anguillicola crassus between the natural host, Anguilla japonica, and the naı¨ve, Anguilla anguilla, is partly due to differences in the ability of the two eel species to mount a humoral immune response.

Download Full-text

Differences in head shape of the European eel, Anguilla anguilla (L.)

Fisheries Management and Ecology ◽

10.1046/j.1365-2400.2000.00207.x ◽

2000 ◽

Vol 7 (4) ◽

pp. 349

Author(s):

J. M. Proman

Keyword(s):

Anguilla Anguilla ◽

European Eel ◽

Head Shape

Download Full-text

Metazoan Parasites and Health State of European Eel, Anguilla Anguilla (Anguilliformes, Anguillidae), From Tonga Lake and El Mellah Lagoon in the Northeast of Algeria

Vestnik Zoologii ◽

10.2478/vzoo-2018-0029 ◽

2018 ◽

Vol 52 (4) ◽

pp. 279-288 ◽

Cited By ~ 1

Author(s):

F. Bakaria ◽

S. Belhaoues ◽

N. Djebbari ◽

M. Tahri ◽

I. Ladjama ◽

...

Keyword(s):

Brackish Water ◽

Parasite Species ◽

Anguilla Anguilla ◽

European Eel ◽

Health State ◽

Component Community ◽

Metazoan Parasites ◽

Parasite Communities ◽

High Dominance ◽

Argulus Foliaceus

Abstract The aim of the study was to examine metazoans parasite communities of European eels (Anguilla anguilla) in freshwater (Tonga Lake) and brackish water (El Mellah lagoon) in the northeast of Algeria. Six parasite taxa were collected: one monogenean, Pseudodactylogyrus sp.; two crustaceans, Ergasilus sp. and Argulus foliaceus; two nematodes, Cucullanus sp. and Anguillicola crassus; one cestode, Bothriocephalus claviceps. Th e most prevalent parasite taxa in freshwater were Pseudodactylogyrus sp., A. crassus and Bothriocephalus claviceps; whereas in the brackish water, eels were infected mainly with A. crassus. Th e characteristics of the parasite component community structure revealed low parasite species diversity and high dominance values in eels from the two localities. Both communities were dominated by a single parasite species: Tonga eels by the monogenean Pseudodactylogyrus sp. and El Mellah lagoon eels by the nematode A. crassus, verified by high Berger-Parker dominance values of 0.76 and 0.87 respectively.

Download Full-text