Showing papers on "Gadus published in 1974"

Drug Effects on Isolated Artery Strips from Two Teleosts, Gadus morhua and Salmo gairdneri

Abstract: The presence of adrenergic and cholinergic receptors in the celiac arteries of the cod, Gadus morhua, and the rainbow trout, Salmo gairdneri, has been investigated. Affinities and intrinsic activities of different catecholamines and acetylcholine have been determined from cumulative dose-response curves. The pD2-value for acetylcholine was 6.62 ± 0.20 in the rainbow trout arteries, while the cod arteries only responded to acetylcholine in concentrations of 10--2 M or more. In both species the potencies of the catecholamines producing contraction of the arteries were in the order adrenaline > noradrenaline > phenylephrine, while isoprenaline did not contract the preparations. In cod arteries competitive antagonism was obtained with yohimbine (pA2= 7.3), phentolamine (pA2= 8.0) and propranolol (pA2= 6.1), while phenoxybenzamine produced non-competitive blockade of the response to noradrenaline (pM50= 6.9). It is concluded that although the rainbow trout celiac artery could possess double innervation, it is unlikely that a cholinergic vasomotor innervation plays any role in regulating the cod celiac artery. A solely adrenergic alpha receptor mediated innervation is therefore proposed for the cod celiac artery.

Migrations and Intermingling of Atlantic Cod (Gadus morhua) Stocks of the Newfoundland Area

Abstract: Commercial recaptures of 26% (22.5% in years after the tagging year) of 18,822 Atlantic cod (Gadus morhua) 50 cm or more in length that were tagged mainly in the feeding season at 13 localities in the Newfoundland area in 1954–55 elucidated migrations and intermingling of cod of various stocks or stock complexes. Cod of the northern Gulf of St. Lawrence stock migrated southward from the Strait of Belle Isle to winter on the northern side of Cabot Strait and vicinity, mingling there with the Burgeo Bank stock. Cod of the Newfoundland–Labrador complex tagged at three sites mingled along the east coast of Newfoundland and off southern Labrador and with cod of the northern Gulf stock near the Strait of Belle Isle, of the Avalon–Burin stock complex off the Avalon peninsula, and of a Grand Bank stock on the northern part of the bank. Though cod tagged off the Avalon peninsula and on St. Pierre Bank were recaptured mainly near the tagging sites, some moved as far north as Labrador, to the southern Grand Bank, an...

Blood flow in dorsal and ventral aortas of the cod, Gadus morhua

Abstract: JONES, DAVID R., B. LOWELL LANGILLE, DAVID J. RANDALL, AND GRAHAM SHELTON. BloodJEow in the dorsal and ventral aortas of the cod, Gadus morhua. Am. J. Physiol. 226(l) : 90-95. 1974.Dorsal and ventral aortic blood flows have been recorded in cod and the flows compared with results from hydraulic and electrical models of the fish circulatory system. In the hydraulic model increase in “dorsal aortic” compliance resulted in an increase in cCdorsal aortic” flow pulsatility and decrease in pressure pulsatility. Damping of the CCdorsal aortic” pressure and flow pulses was illustrated by a simple analysis of a windkessel model. In the animal the ventral aortic flow pulse was 75 yO of the mean flow, whereas in the dorsal aorta flow was less oscillatory (pulse 46y0 of mean flow) ; nevertheless, flow was twice as pulsatile as pressure in the dorsal aorta. The results are discussed in terms of a simple windkessel model and it is concluded that considerable compliance resides after the gills. In this light, the advantages of smooth gill blood flow are examined paying particular attention to the effect of pulsatile flow in the gills on gas exchange.

The ability of cod (Gadus morhua) to orient towards a sound source.

Abstract: In freien Schallfeld wurde in einer Belohnungsdressur beim Kabeljau (Gadus morhua) akustische Lokalisation nachgewiesen. Die Entfernung des Fisches von der Schallquelle betrug 5,3 m (f=75 Hz). Ausschaltversuche zeigen, dass das Seitenorgansystem nicht wesentlich an der Schallrichtungsunterscheidung beteiligt ist.

Some biochemical characteristics of cod (Gadus morhua L.) from the Faroe bank compared with those from other fishing grounds.

Abstract: 1. 1. Several chemical criteria of biological condition were measured in cod ( Gadus morhua L.) caught in spring and autumn on a wide range of fishing grounds. 2. 2. While the water content of the muscle of well-fed fish usually lies between 80 and 81 per cent and rises in starvation, the muscle of cod caught on the Faroe Bank appears to be unique in that values below 80 per cent are frequently found during both seasons. 3. 3. The level of liver glycogen correlated significantly (negatively) with the minimum pH of the muscle after death but not with the muscle water content. 4. 4. The liver lipid content correlated negatively with both muscle pH and water content. 5. 5. The muscle of tcod shows an inverse relationship between water content and protein, akin to the “fat-water line” of fatty species. 6. 6. The proportion of dark muscle tissue in the musculature shows little variation from ground to ground, but preliminary observations show that the content of haem pigments in the dark muscle itself varies considerably, being most concentrated in Spitzbergen and Bear Island cod and least in those from the Faroe Bank.

Effect of Mincing on Glycolytic Activity in Prerigor Atlantic Cod (Gadus morhua) Muscle Stored in Ice or Frozen

Abstract: Mincing caused at least a threefold increase in the postmortem rates of both glycogen breakdown and loss of high energy phosphate in unfrozen samples of prerigor Atlantic cod (Gadus morhua) muscle ...