Some Enzymatic Properties of Plasma Esterases from Channel Catfish (Ictalurus punctatus)

1971 ◽  
Vol 28 (4) ◽  
pp. 613-616 ◽  
Author(s):  
James W. Hogan
Keyword(s):  
Fish Species ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Ester Hydrolysis ◽  
Phenyl Acetate ◽  
Plasma Enzymes ◽  
Esterolytic Activity ◽  
Glyceryl Triacetate ◽  
Brain Acetylcholinesterase

Rates of ester hydrolysis by plasma enzymes from five fish species ranged from 12 8 to 46.6 μmoles acetylcholine hydrolyzed/ml plasma per hr. Enzymes in channel catfish (Ictalurus punctatus) plasma hydrolyzed the substrates acetylcholine, phenyl acetate, and glyceryl triacetate at rates of 28.1, 96.7, and 6.8 μmoles substrate hydrolyzed/ml plasma per hr, respectively. Esterolytic activity was attributed, in part, to an acetylcholinesterase-like enzyme. In vitro organophosphate inhibition of enzymes in channel catfish plasma was similar to that previously reported for catfish brain acetylcholinesterase (EC 3.1.1.7, acetylcholine acetyl-hydrolase).

Effect of Extended Galvanonarcosis on Behavior of Rainbow Trout, Salmo gairdneri, and Channel Catfish, Ictalurus punctatus

1978 ◽  
Vol 35 (10) ◽  
pp. 1297-1302 ◽  
Author(s):  
Kevin D. Curry ◽  
Boyd Kynard
Keyword(s):  
Rainbow Trout ◽  
Key Words ◽  
Fish Species ◽  
Direct Current ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Group Activity ◽  
Salmo Gairdneri ◽  
Prey Vulnerability

Yearling rainbow trout, Salmo gairdneri, and channel catfish, Ictalurus punctatus, were subjected to 0.5- and 3-h periods of narcosis using continuous direct current. Galvanonarcosis treatments decreased the immediate individual and group activity in both species of fish. Twenty-four hours after treatment, all fish except trout narcotized for 3 h recovered to levels of individual and group activity equivalent to those of untreated fish. Photonegative response was strong in both fish species and was not influenced by galvanonarcosis treatments. Trout narcotized with direct current were more vulnerable to predation than untreated fish; susceptability increased with increasing treatment periods. The potential of extended galvanonarcosis as a fish immobilization technique is strong. Key words: galvanonarcosis, behavior, extended narcosis, direct current, rainbow trout, channel catfish, photonegative, activity, prey vulnerability, immobilization

Isolated perfused Brockmann body as a model for studying pancreatic endocrine secretion

1982 ◽  
Vol 243 (5) ◽  
pp. E352-E359 ◽  
Author(s):  
P. Ronner ◽  
A. Scarpa
Keyword(s):  
Pancreatic Islet ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Glucose Concentration ◽  
In Vitro Perfusion ◽  
Morphological Criteria ◽  
Endocrine Secretion ◽  
A Minor ◽  
Biphasic Release

The release of insulin, glucagon, and somatostatin was investigated in a newly developed in vitro perfusion preparation of the splenic Brockmann body (principal pancreatic islet) of the channel catfish (Ictalurus punctatus). The preparation was viable for up to 7 h by functional and morphological criteria. Glucose evoked a biphasic release of insulin and somatostatin, but had no effect on the release of glucagon. Arginine at basal glucose concentration caused a marked release of insulin and glucagon, but only a minor release of somatostatin.

In vitro and in vivo interaction of macrophages from vaccinated and non-vaccinated channel catfish (Ictalurus punctatus) to Edwardsiella ictaluri

2009 ◽  
Vol 26 (3) ◽  
pp. 543-552 ◽  
Author(s):  
Riccardo Russo ◽  
Craig A. Shoemaker ◽  
Victor S. Panangala ◽  
Phillip H. Klesius
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Edwardsiella Ictaluri

Difference in glucose dependency of insulin and somatostatin release

1984 ◽  
Vol 246 (6) ◽  
pp. E506-E509 ◽  
Author(s):  
P. Ronner ◽  
A. Scarpa
Keyword(s):  
Insulin Release ◽  
Dose Response ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Hormone Release ◽  
Response Curves ◽  
Glucose Sensitivity ◽  
D Cells ◽  
Comparable Finding

The splenic Brockmann body of channel catfish (Ictalurus punctatus) was isolated and perfused in vitro. It has been shown previously that the hormone release from the catfish pancreas in response to various stimuli resembled that of a mammalian pancreas. The release of insulin and somatostatin was measured at various concentrations of glucose in the perfusate, and the corresponding dose-response curves were derived. As in a variety of mammalian pancreases, insulin release was stimulated half-maximally at ca. 9 mM glucose. In contrast, half-maximal somatostatin release occurred already at ca. 5 mM glucose. Although a comparable finding with mammalian D cells has not yet been reported, histological and physiological resemblances of the mammalian and the fish pancreas suggest that mammalian D cells may also have a glucose sensitivity in the 5 mM range.

scholarly journals Complete Genome Sequence ofEdwardsiella piscicidaIsolate S11-285 Recovered from Channel Catfish (Ictalurus punctatus) in Mississippi, USA

2016 ◽  
Vol 4 (6) ◽  
Author(s):  
Stephen R. Reichley ◽  
Geoffrey C. Waldbieser ◽  
Hasan C. Tekedar ◽  
Mark L. Lawrence ◽  
Matt J. Griffin
Keyword(s):  
Genome Sequence ◽  
Fish Species ◽  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Complete Genome Sequence ◽  
Complete Genome ◽  
Facultative Anaerobe ◽  
Gram Negative ◽  
Cultured Fish ◽  
Edwardsiella Piscicida

Edwardsiella piscicidais a recently described Gram-negative facultative anaerobe and an important pathogen to many wild and cultured fish species worldwide. Here, we report the complete and annotated genome ofE. piscicidaisolate S11-285 recovered from channel catfish (Ictalurus punctatus), consisting of a chromosome of 3,923,603 bp and 1 plasmid.

Accumulation of I131 by channel catfish (Ictalurus punctatus) ovaries in vivo and in vitro

1966 ◽  
Vol 6 (2) ◽  
pp. 231-238
Author(s):  
Raymond H. Lindsay ◽  
Cynthia Romine ◽  
Frank Zacharewicz ◽  
Harry K. Dupree ◽  
Kermit E. Sneed
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish
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