Commercial vs. survey data in length-based stock assessment: insights from Turkish crayfish fisheries

Open Access

Table 1

Monthly carapace length distribution (mm) of P. leptodactylus by sampling codend.

Month	Fyke net	N	Min-Max	Mean±SE	CI (%95)	p*
Jun-21	Com.	440	21.54–80.62	46.18±0.478	0.939	<0.001
	Exp.	331	25.66–67.59	41.83±0.472	0.928
Jul-21	Com.	307	32.32–75.26	45.79±0.398	0.784	<0.001
	Exp.	214	17.36–73.63	41.84±0.456	0.899
Aug-21	Com.	359	33.30–72.48	48.04±0.355	0.698	<0.001
	Exp.	258	15.35–65.31	38.83±0.754	1.485
Sep-21	Com.	275	24.88–69.52	48.98±0.388	0.764	<0.001
	Exp.	386	15.83–66.19	35.61±0.502	0.988
Oct-21	Com.	212	26.99–71.80	49.57±0.621	1.223	<0.001
	Exp.	273	19.24–64.78	35.94±0.529	1.041
Nov-21	Com.	343	26.68–76.21	52.69±0.529	1.040	<0.001
	Exp.	272	21.70–70.67	41.73±0.653	1.285
Dec-21	Com.	856	33.20–76.91	51.44±0.260	0.510	<0.001
	Exp.	767	23.63–71.24	45.27±0.314	0.617
Jan-22	Com.	11	45.23–63.63	52.80±1.581	3.523	>0.05
	Exp.	26	44.26–62.06	51.22±0.763	1.571
Feb-22	Com.	147	26.03–70.37	50.63±0.749	1.480	<0.001
	Exp.	385	19.45–68.17	42.59±0.554	1.089
Mar-22	Com.	668	26.44–75.22	50.50±0.325	0.639	<0.05
	Exp.	689	21.41–73.56	48.52±0.391	0.767
Apr-22	Com.	1251	26.81–79.38	52.22±0.231	0.453	<0.001
	Exp.	922	20.49–73.41	48.46±0.330	0.648
May-22	Com.	674	30.15–73.74	51.22±0.287	0.564	<0.001
	Exp.	614	25.36–77.79	45.96±0.404	0.794
Total	Com.	5543	21.54–80.62	50.39±0.113	0.221	<0.001
	Exp.	5137	15.35–77.49	44.09±0.149	0.292

^p*:

Carapace length comparison of crayfish between different fyke nets for same month.

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