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- W2018052246 abstract "The relationship between fish yield, water quality and fishing effort was explored in 70 Finnish lakes. The total yield (kg ha−1 yr−1) was also split to species level (11 species). Fishing effort was estimated by the number of fishermen (fishermen km−2). The principal components of water quality variables were extracted. The first component comprised total nitrogen and phosphorus, water colour and oxygen saturation; the second was an association of pH, alkalinity and conductivity. Together they retained about 77% of the variation in the original data. The best single predictor for the total fish yield was the number of fishermen (R2 = 0.47), but also the second principal component entered as a variable in a stepwise regression model (R2 = 0.53). No regional differences were found, so the model is potentially valid for the whole country. However, the spread of the data around the model was considerable; close to 50% of the variation in yield remained unexplained. At the species level, fishing effort was needed as a variable in six models (in four of them as the first variable entering the model) and water quality in five models (four times as the first variable). The variation of yield explained by these models ranged from 21% to 49%. Generally, water quality was less important in determining the yield than fishing effort. This was confirmed by partitioning out the effect of effort variables from the correlation between yield and water quality. No obvious improvements in the coefficients were observed." @default.
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- W2018052246 date "1992-10-01" @default.
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- W2018052246 title "Water quality, fishing effort and fish yield in lakes" @default.
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- W2018052246 doi "https://doi.org/10.1016/0165-7836(92)90007-g" @default.
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