摘要:

Fifty rainbow trout of the Kamloops strain were examined for 12 haematological parameters: erythrocyte sedimentation rate, haemoglobin, packed cell volume, erythrocyte count, erythrocyte diameters, mean cell volume, mean cell haemoglobin, mean cell haemoglobin concentration, leukocyte count, differential leukocyte count, plasma total protein and plasma glucose concentration. The fish had been held under known environmental and dietetic conditions, and at the time of sampling were 14 months old. The majority of results for erythrocyte sedimentation rate, haemoglobin, packed cell volume, erythrocyte count, erythrocyte diameters, total protein and differential leukocyte count fell within narrow ranges. The total leukocyte counts and glucose levels were more widely spread. The results are discussed and compared with those already published for Idaho and Shasta strains. It is impossible to say whether the differences that were observed between Kamloops and these other varieties were due to strain alone, since other variables were present. Some problems associated with establishing normal ranges for these parameters in fish are discussed.

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04425.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

Plaice (PleuronectesplatessaL.) from three spawning areas in the southern North Sea were examined for six species of metazoan parasite. Differences of both incidence and level of infestation with particular parasite species were found in fish from the three areas. Neither the incidence nor the level of infestation was associated with the length of fish in the samples except in the case of the larger male fish from Flamborough, which tended to contain more larval nematodes (Anisakidae). All fish contained the intestinal nematodeCucullanus heterochrous, although fewer were found in fish from Flamborough. Southern Bight fish were more likely to containCapillaria wickinsithan were fish from Flamborough or the German Bight. Flamborough fish were more likely to contain Anisakidae larvae than were fish from the other two areas. Fish from the three areas were similarly infested withZoogonoides viviparus.Male fish from Flamborough were less likely to be infested withLepeophtheirus pectoralisthan male fish from the German Bight.

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04426.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

Infection of a serranid fish,Morone chrysops, with the adult female ‘anchor worm’Lernaea cruciatawas accompanied by an inflammatory response characterized by an extensive proliferation of fibrous connective tissue elements Both the dermis and musculature of the host were involved. No mineralization of tissues was observed. This constitutes the first report ofL. cruciatafromM. chrys

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04427.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

General studies cover the habitat and life cycle of a migratory population ofProchilodus platensis. Specific studies of this species involved the elucidation and evaluation of abiotic effects on local upstream migrations and preliminary age and growth estimations. Upstream movements appeared to be affected by water temperature and moon phase. Most of the fish moved upstream when the temperature was between about 14 and 18°C at the particular monitoring point. Catches of ascending fish were highest during the full moon quarter, less during the waxing phase and least during the waning and new moon quarters. Length frequency and scale check data allowed approximate, indirect estimations to be made of the modal lengths attained in each of the first five age‐grou

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04428.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

L. umbratuspituitary glands were partially separated by means of preparative polyacry‐lamide electrophoresis and chromatography on DEAE‐cellulose and Sephadex G‐50. Eight fractions were obtaìned and it was found that fraction 1 contained potent adrenocorticotropic stimulating activity, with a molecular weight in the region of 6000. Fractions 3 and 4 contained potent gonadotropic and a lesser degree of exopthalmic producing activity, with molecular weights in the region of 14 000 to 20 000. Fraction 6 displayed pigeon‐crop stimulating activity, with a molecular weight above 30 000. Fractions 7 and 8 displayed M.S.H. and vasopressinoxytocic activity respectively, with a molecular weight in the region of 5500–6500. Fractions 2 and 5 could not be identified. The fractions seemed to be glycoproteins and the results are discussed in relation to previou

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04429.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

This, the first of two papers on the scarcer freshwater fishes of the British Isles, gives an account of the introduced species. Nineteen species are included. The natural distribution of these fishes, the history of their introduction, their success in acclimatization, and their present distribution in the British Isles are given. A brief discussion on the introduction of exotic fishes to aquatic ecosystems follows.

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04430.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

Observations are recorded on the time of spawning of 83 species of Caribbean reef fishes. Details of seasonal variations in the percentage of sexually active fishes are given for 35 species. The majority of species spawn mostly when water temperatures are minimal, in February, March and April. The expected biomass of reef fish eggs in the plankton is about twelve times greater in the above mentioned period than in the period from June to December. Normal recruitment to insular fisheries may be very greatly dependent upon the success of parent stocks spawning elsewhere in the Caribbean and the abundance of recruits to a particular area may be dependent upon the speed and direction of the prevailing currents which carry larvae and juveniles to the insular shelves.

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04431.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

A simple technique for estimating the survival of eggs during their incubation in stream gravels by planting eggs in specially designed egg boxes is described. This technique ensures that all the live eggs and alevins present in the gravel at the time of sampling can be recovered. Survival can be calculated accurately from the ratio of the number of live recovered to the number of eggs originally planted and the errors caused by the loss of dead eggs and escape of live alevins from the sample area are avoided.

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04432.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

The effect of food level on the egg production of three‐spined sticklebacks was studied experimentally. High food levels increased the percentage of fish that matured, and the weight of the fish at maturity. Weight at maturity was positively correlated with the number of spawnings, the mean number and the weight of eggs produced per spawning. Food level had no effect on the size of the eggs, whether size was expressed as wet or dry weight per egg. Fish on the highest food level spawned at shorter intervals than fish at the lower levels. A preliminary model of the effect of food supply on recruitment to a stickleback population is nresente

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04433.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

Treatment of cut‐throat trout broodfishSalmo clarki(Richardson) with Sulphamerazine at 220 mg/kg (10 g/100 1b) of fish/day for 14 days resulted in severe kidney histopathology and increased mortality among males. Experimental data presented showed that cut‐throat trout broodfish were extremely sensitive to Sulphamerazine toxicity. Hydropic degeneration of renal tubule epithelium and haemorrhage into tubule lumens were observed in kidneys of both male and female trout, but was more severe in the former. Death, which occurred only in males, was correlated with spawning stress and impaired renal funct

ISSN:0022-1112    

DOI:10.1111/j.1095-8649.1973.tb04434.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY