摘要:

ABSTRACTThis paper describes a computer program for the analysis of catch returns from put‐and‐take fisheries that can be operated by personnel with minimal computer training. The program was developed for the Toft Newton fishery in Lincolnshire and the method of collecting the data is illustrated. The advantages of using computer analysis for assessing the state of a fishery are outlined. A completed listing of the program can be obtained from the auth

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1981.tb00021.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

ABSTRACTThe operation of a put‐and‐take trout fishery at Toft Newton reservoir is analysed from detailed studies of the 1978 and 1979 seasons. Toft Newton is only a small reservoir but the large number of anglers that utilize the fishery mean that the stocking rates per hectare of water have to be very high. As a result of these high densities and a short average residence time in the reservoir, rainbow trout which were the predominantly stocked species do not grow after release. Brown trout, however, which were stocked at lower densities do grow after release. The success rate of the 8–9% of anglers not returning their catch data was examined using a postal survey. Partial correlation analysis indicated that the numbers of fish in the reservoir, the number of anglers fishing and the number of hours of sunshine significantly affected the catch rate. A regression between catch rate and number of fish in the reservoir only explained 35% of the variability but the addition of the other two factors did not significantly improve the accuracy of the model. The market area of the fishery was studied from the register of anglers. Most anglers attending Toft Newton travel a considerable distance to the fishery, the peak number driving from 98–129 km (61–80 miles) round trip. The present and future management policy of the fishery is discussed in the light of this analysis and many of the recommendations may also apply to other small put‐and‐take tr

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1981.tb00022.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

ABSTRACTChanges in Israel's freshwater fish fauna during the past 50 years were caused by: (1) introduction or transfer of foreign and native species for culturing, development of fishery resources in Lake Tiberias and reservoirs, and ecological control; (2) land reclamations; and (3) utilization of water reserves for domestic, agricultural and industrial purposes. The exotic fishes that reproduce naturally in inland waters areGambusia affinis, Cyprinus carpio, Sarotherodon niloticusandBasilichthys bonariensis. A population ofSalmo gairdneriinhabits the upper reaches of the Jordan River, but it is doubtful if it reproduces. Non‐naturally reproducing exotic species include:Hypophthalmichthys molitrix,Ctenopharyngodon idellaandAristichthys nobilis. These species are, however, artificially reared and propagated. The reclamation of Lake Hulah brought to near extinctionTristramella simonis intermedia. Pond culture and the construction of the national water carrier contributed to the spreading of several species into new areas; among them mugilids,Sarotherodon aureusand its hybrids withSarotherodon niloticus. Due to wise management policy, the introduction of exotic fishes into Israeli waters proved to be economically advantageous without causing ecological disturbance

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1981.tb00023.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1981.tb00024.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY

摘要:

Book reviewed in this articleTheory and Practice of Eel Culture. By ISAO MATSUI.The Guiness Guide to Game Fishing, by W. B. CURRIE.British Fresh‐Water Fishes, by the REV. W. HOUGHTON.The Ring‐Net Fishermen. By ANGUS MARTIN.The Salmon Rivers of Scotland. By DEREK MILLS and NEIL GRAES

ISSN:1355-557X    

DOI:10.1111/j.1365-2109.1981.tb00025.x

出版商:Blackwell Publishing Ltd    

年代:1981

数据来源: WILEY