Temat: fish yield - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Abiotic factors as a long-term stressor for the vendace fisheries in Lake Ińsko (European Central Plains Ecoregion, Poland)
Autorzy:: Czerniejewski, Przemysław
Strzelczak, Agnieszka
Machula, Sylwia
Martinez-Bracero, Moises
Powiązania:: https://bibliotekanauki.pl/articles/2203568.pdf
Data publikacji:: 2022
Wydawca:: Instytut Technologiczno-Przyrodniczy
Tematy:: biogens
fish yield
hydrochemical condition
Lake Ińsko
vendace
Opis:: The population of vendace (Coregonus albula L., 1758) in many European lakes, especially in Central Europe, have declined recently as a result of lake eutrophication. The aim of the study was to (i) determine many years’ changes in the volume of vendace catches and specific physicochemical parameters of water, (ii) determine correlations between particular physicochemical parameters, and (iii) indicate hydrochemical parameters which show the greatest impact on the volume of vendace catches on the example of Lake Ińsko located in the European Central Plains Ecoregion. Principal Component Analysis (PCA) was applied to indicate the most important hydrochemical variables impact on vendace fisheries. Among them, after redundancy analysis, 6 were taken into account (total nitrogen, N-NO3, N-NO2, total phosphorus, oxygen concentration, temperature). Time series analysis revealed an increasing trend in nutrients concentration in lake. Analyses showed that fish catches were mostly negatively connected to nitrogen and phosphorus concentration. Trend analysis, based on the above-mentioned parameters, can provide prediction of vendace catches for further years with the predictability at the level of around 60% accuracy. The results of this study are very crucial to the vendace fisheries and for formulating fisheries management policies in the future in the changing hydrochemical condition of lakes.
Źródło:: Journal of Water and Land Development; 2022, Special Issue; 24--33
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Artisanal fisher folk’s perception of the effects of variability in climatic factors on fish yield in Kainji Lake basin, Nigeria
Autorzy:: Sa’adu, Mustapha
Tafida, Ahmadu Abubakar
Powiązania:: https://bibliotekanauki.pl/articles/952119.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:: artisanal fisher folk
variability
perception
fish
yield
kainji lake
Opis:: This study assessed the artisanal fisher folk’s perception of the effects of variability in climatic factors on fish yield in Kainji Lake basin. The specific objectives were to: describe the socio-economic characteristics of the respondents; assess the artisanal fisher folk’s perception of the effects of variability in climatic factors on fish yield; and assess the influence of variability in climatic factors on fish yield. Both primary and secondary data was used for the study. Primary data was collected from 173 respondents using structured questionnaires while secondary data was obtained from the Power Holding Company of Nigeria and the National Institute of Freshwater Fisheries Research (NIFFR), all of them located in New Bussa, Niger State. Once collected, the data was analyzed based on descriptive and inferential statistics involving the use of multiple regression models. As shown by the results, 91.32% of respondents were male; many (75.14%) of them aged between 41 and 60. Most of them (90.18%) were married and had Quranic education (96.62%). 48.74% had a household composed of 6 to 10 members. The respondents perceived all the factors of climate variability (draught, change in the lake’s water levels, variations in the seasonal calendar, change in seasonal rainfall, Harmattan intensity and change in temperatures) as unfavorable developments (with small variations in the mean scores). As an exception, humidity and change in sunlight conditions were believed to be favorable aspects by the respondents. The implication is that all the variables except humidity and change in sunlight conditions will adversely affect the fish yield, as claimed by the respondents. As shown by the results of a multiple regression study of the influence of variability in climatic factors on fish yield, the temperature had a negative influence on fish yield, whereas water inflow had a positive effect. The study recommends that the local population should attend adult literacy classes and improve their formal education levels. The management of NIFFR and other higher authorities, such as the Ministry of Water Resources and the Ministry of Environment, that are vested with the responsibility of managing the water bodies, should be advised to stock the water bodies with fish species that are resistant to temperature. In turn, the artisanal fisher folk should be encouraged to improve on their management practices, especially as regards overfishing and the use of obnoxious fishing methods. Also, they should extend their livelihood to such areas as crop production, animal breeding, trading/commerce and services as alternative income diversification strategies to cushion the effect of declining fish yields as a result of climate change.
Źródło:: Journal of Agribusiness and Rural Development; 2017, 46, 4; 825-833
1899-5241
Pojawia się w:: Journal of Agribusiness and Rural Development
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of Compost from By-Product of the Fishing Industry on Crop Yield and Microelement Content in Maize
Autorzy:: Radziemska, M.
Mazur, Z
Powiązania:: https://bibliotekanauki.pl/articles/125267.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: compost
fish waste
maize (Zea mays L)
microelements
yield
Opis:: A pot experiment was conducted to compare the effects of compost from fish waste with mineral and manure fertilization on the yield and chemical composition of the overground parts of maize (Zea mays L.). The experiment comprised two series: I – composts at a dose of 1 g of compost per pot, and II – composts with 0.5 g of urea. The treatments were conducted on the following types of composts: compost 1: fish waste (80% d.m.), sawdust (20% d.m.); compost 2: fish waste (80% d.m.), straw (20% d.m.); compost 3: fish waste (80% d.m.), bark (20% d.m.); compost 4: fish waste (79.3% d.m.), sawdust (19.7% d.m.), lignite (1% d.m.); compost 5: fish waste (79.3% d.m.), straw (19.7% d.m.); lignite (1% d.m.); compost 6: fish waste (79.3% d.m.), bark (19.7% d.m), lignite (1% d.m). The contents of Ni, Zn, Cr, Cu and Cd were deter-mined in an air-acetylene flame using the flame atomic absorption spectrophotometric method. The average crop yield of the overground parts of maize in the series without additional mineral fertilization and with mineral N-fertilization was higher compared to objects without mineral N-fertilization. The highest crop yield was noted in the case of compost containing fish waste and straw with addition of lignite and with bark and lignite. The addition of lignite to the compost mass in the series with mineral N fertilization had stronger influence on the content of cadmium, chromium, nickel and zinc in the overground parts of maize.
Źródło:: Journal of Ecological Engineering; 2015, 16, 4; 168-175
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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