The effects of environmental factors and fisheries management on recreational catches of perch Perca fluviatilis in the Czech Republic

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Table 3

Results of GLMM models for annual total recreational catch and yield of perch Perca fluviatilis summed across all studied fishing grounds in the Czech Republic between 2005 and 2016.

Dependent variable	Intercept	SD (intercept)	Mean value	95% CI	Var(RE)	DF	R²	Explanatory variable	Slope	SD (slope)	p−value
Catch	4521.75	689.21	23.36	15.46–29.38	2.03	2681	0.17	Year	−2.02	0.31	< 0.001
Catch	4128.62	726.28	25.35	12.51–42.16	3.12	2681	0.07	Eutrophication	0.15	0.07	0.42
								Temperature	−0.345	0.138	0.12
								No. fishing visits	−0.0021	0.001	0.01
Yield	1033.25	188.74	6.21	4.62–8.79	0.55	2681	0.15	Year	−0.50	0.10	< 0.001
Yield	988.52	203.54	6.62	2.38–10.21	1.08	2681	0.04	Eutrophication	−1.04	0.13	0.11
								Temperature	−0.73	0.46	0.27
								No. fishing visits	−0.0071	0.004	0.04
Catch per visit	4.11	0.73	0.0351	0.0157–0.0282	0.001	1955	0.18	Year	-0.002	0.0003	< 0.001
Catch per visit	4.01	0.82	0.0366	0.0099–0.0391	0.002	1955	0.03	Eutrophication	-0.001	0.0001	0.27
								Temperature	−0.0006	0.0003	0.07
								No. fishing visits	−0.000015	0.000004	< 0.001
Yield per visit	1.00	0.20	0.0068	0.0050–0.0086	0.0001	1955	0.16	Year	−0.0004	0.0001	< 0.001
Yield per visit	0.93	0.38	0.0065	0.0041–0.0084	0.0002	1955	0.07	Eutrophication	−0.00031	0.00008	0.34
								Temperature	−0.00015	0.00011	0.18
								No. fishing visits	−0.000012	0.000008	< 0.001
Representation in catch	103.27	24.81	0.021	0.012–0.025	NA	2514	0.12	Year	−0.0006	0.0003	0.08
Representation in catch	106.11	25.38	0.026	0.009–0.032	NA	2514	0.04	Eutrophication	0.0002	0.0001	0.83
								Temperature	0.000021	0.0000035	0.95
								No. fishing visits	−0.0000008	0.0000003	0.01
Representation in yield	99.12	38.62	0.004	0.003–0.005	NA	2514	0.08	Year	0.000022	0.000016	0.09
Representation in yield	91.24	33.62	0.003	0.002–0.007	NA	2514	0.03	Eutrophication	0.000022	0.00005	0.96
								Temperature	0.000081	0.000017	0.65
								No. fishing visits	−0.0000012	0.00000016	0.04
Average body weight	−10.38	2.89	0.36	0.25–0.46	0.01	1611	0.14	Year	0.005	0.001	< 0.001
Average body weight	−13.12	3.21	0.42	0.22–0.58	0.03	1611	0.01	Eutrophication	0.0025	0.0004	0.56
								Temperature	−0.0001	0.00006	0.94
								No. fishing visits	0.000022	0.000012	0.12

SD = standard deviation; CI = confidence interval; var(RE) = variance for random effect; DF = degrees of freedom; NA = not applicable. Statistically significant results are in bold.

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