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Senkai yōshoku to jika osen | 浅海養殖と自家污染 | Fish culture in shallow and polluted waters
1977
Evaluation of a Water Analysis Kit1,2 Texte intégral
1977
Boyd, Claude E.
A Hach DR-EL/2 Direct Reading Engineer's Laboratory Kit (Hach Chemical Co., Ames, Iowa) was evaluated by comparison to standard analytical methods. Results of Hach kit methods were highly correlated with concentrations of standard solutions. The y-intercepts (a) did not differ from 0 for most methods, but for 11 methods regression coefficients (b) differed from 1.0. For each of the 20 parameters, three natural water samples were analyzed seven times by Hach kit and by the standard method. Mean values obtained by the two analytical systems were usually significantly different and the standard method sometimes gave higher precision than the Hach kit. Nevertheless, the Hach kit usually gave close approximations of values obtained by standard methods. Comparisons also included analyses of a large series of natural water samples. Correlation coefficients between Hach kit and standard methods were often > 0.99. Although a = 0 for 14 methods, b = 1.0 for only 8 methods. Reliability of the Hach kit was adequate for general surveys of water quality, fisheries management decisions, and research requiring only approximate data on water quality.
Afficher plus [+] Moins [-]Preparation of financial budget for fish production, catfish production in areas with level land & adequate ground water
1977
McCoy, E. W. | Boutwell, John Lewis
Science and fisheries management
1977
Went, A. E. J. (Arthur Edward James)
2. First survey of a rudd population in New Zealand
1977
Coates, G.D. | Turner, A.S. (Ministry of Agriculture and Fisheries, Wellington (New Zealand). Fisheries Management Div.)
Proceedings of the 1974 seminar on freshwater pollution in New Zealand
1977
Little, R.W. | Scott, D. | Skrzynski, W. (eds.) (Ministry of Agriculture and Fisheries, Wellington (New Zealand). Fisheries Management Div.)
The economics of fisheries management
1977
Anderson, Lee G.
Osnovy ėkonomiki rybovodnogo khozi︠a︡ĭstvo | Basic economics of fish husbandry
1977
Mi︠a︡zin, Ivan Dmitrievich | Semenov, Vladislav Mikhaĭlovich
Fisheries management goals, problems and options Texte intégral
1977
Tuomi, A.L.W. | FAO, Rome (Italy). Fisheries Dept. eng | European Consultation on the Economic Evaluation of Sport and Commercial Fisheries eng 22 Sep 1975 2 Gothenburg (Sweden)
Illus.; 6 ref.; Summaries (En, Fr)
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