Potential spread of invasive crayfish used as life bait by Indonesian anglers

Figures & data

Figure 1. The percentage of respondents sorted by their home islands in Indonesia.

Figure 2. Age distribution based on the type of work of anglers in Indonesia. Error bars show the confidence interval or standard error of the mean, that shows how much error is built into the chart.

Table 1. Goodness of fit results.

	Chi-Square	df	Sig.
Pearson	31,287	237	1,000
Deviance	20,710	237	1,000

Table 2. Likelihood Ratio Test results.

Effect	Model Fitting Criteria	Likelihood Ratio Tests
	-2 Log Likelihood of Reduced Model	Chi-Square	df	Sig.
Intercept	27.642^a	0,000	0
Age	162,876	135,234	120	0,162
Main Job	71.996^b	44,354	18	0,001
Education	44.148^b	16,507	9	0,057
Home Island	108.947^b	81,305	24	0,000

Table 3. Pseudo R-Square results.

Pseudo R-Square
Cox and Snell	0,871
Nagelkerke	0,970
McFadden	0,898

Table 4. The types of status in Indonesia, location of use, and sources of bait reported by anglers in Indonesia. The Sum of percentages exceeds 100% for bait types for which multiple sources were reported by some respondents.

Common name reported	Status in Indonesia	Location of use	Reported source of bait
			Cricked breeder		Farmland		Lake/Reservoir		River		Fishing shop
			n	%	n	%	n	%	n	%	n	%
Earthworms	Native	Lake/Reservoir; Pond; River	0	0	30	1.00	0	0	0	0	0	0
Crickets	Native	Lake/Reservoir; River	15	1.00	0	0	0	0	0	0	0	0
Crayfish	Non-native	Lake/Reservoir; Pond; River	0	0	0	0	3	0.16	16	0.84	0	0
Fresh meal		Pond	0	0	0	0	0	0	0	0	84	1.00

Figure 3. The activities of Indonesian anglers. (a) fishing in the reservoir; (b) fishing in the pond; (c) fishing in the river well-vegetated with invasive water hyacinth (Pontederia crassipes); and (d) fishing in the brook.

Figure 4. The amount and percentage of bait use based on angling habitat.

Figure 5. Crayfish Cherax quadricarinatus used as live bait by Indonesian anglers.

Data availability statement

The data that support the findings of this study are available from the corresponding author [SGA]upon reasonable request.