Sustainability or fun? Recreational angling in Marine Protected Areas

Hasan Cerim

doi:10.26881/oahs-2022.1.04

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Sustainability or fun? Recreational angling in Marine Protected Areas

Oceanological and Hydrobiological Studies

Volume 51 (2022): Issue 1 (March 2022)

By: Hasan Cerim

Open Access

|Mar 2022

Figures & Tables

Study area; 1 and 2 indicate anglers’ locations

Fishing tackle characteristics (Soykan et al. 2020)

Weights of D. vulgaris at/after first maturity length (Lm) and minimum landing size (MLS) estimated from the length–weight relationships in the collected data

CPUE in recreational angling in the MPA

	Total catch estimation	Catch (kg)
Daily (1 angler)	0.328 kg	0.3
One weekend (1 angler)	0.328 kg × 2 days	0.7
All weekends in a year (1 angler)	0.328 kg × 2 days × 52 weeks	34.1
3 anglers (min.)	0.328 kg × 2 days × 52 weeks × 3 anglers	102.3
25 anglers in a year (mean)	0.328 kg × 2 days × 52 weeks × 25 anglers	852.8
50 anglers (max)	0.328 kg × 2 days × 52 weeks × 50 anglers	1705.6

Results of non-linear regression for D_ vulgaris

N	L_min.–L _max(cm)	W_min.–W_max (g)	a	b	CI of a	CI of b	S.E. of b
12	6.3–13.0	4.04–37.42	0.0131	3.10	0.0068–0.0239	2.86–3.37	0.115

Length at first maturity of fish caught in the Akyaka MPA by species

Species	Total Length (cm)			Sex	MLS	Length at First Maturity (cm)
	Min.	Max	Mean			Researchers
	Min.	Max	Mean			Kacem & Neifar (2014)	İşmen et al. (2004)	Bernardes & Dias (2000)
Balistes capriscus	12.5	12.5	12.5	M		21.3 FL		16.9
				F		20.26 FL		20
				M+F			>13
						İlkyaz et al. (2018)	Filiz & Toğulga (2009)	Kırdar & İşmen (2018)
Gobius niger	6.6	7	6.8	M		11.09
				F		11.42	7.8
				M+F				9.58
						Tuset et al. (2005)	İlhan et al. (2010)	Zorica et al. (2006)
Serranus scriba	12.4	17	14.7	M		17.3	13.2	9.3
						Bariche 2003
Siganus luridus	8.2	15.2	11.1	M		13.9
				F		14.2
						Bariche et al. (2003)	Gabr et al. (2018)
Siganus rivulatus	9.4	18.5	12.66	M		13.25	18.35
				F		13.65
				M+F
						Soykan et al. (2015)	Bottari et al. (2014)	Layachi et al. (2015)
Boops boops	8.7	12.7	9.7	M		9.35	14.2	13.3
				F		12.96	13.1	14.3
				M+F			13.8
						Morales-Nin & Moranta (1997)	Grau et al. (2016)	Cetinic et al. (2002)
Dentex dentex	19			M		52.02	33.8	33.3
				F		34.6	34.9	34.5
				M+F
						Mouine et al. (2007)	Benchalel & Kara (2013)	Al-Beak et al. (2017)
Diplodus sargus	6.5	13.7	9.35	M			20.2
				F	21.0		20
				M+F		20.95		21.27
						Chaouch et al. (2013)	Pajuelo & Lorenzo (2001)	İlkyaz et al. (2018)
Diplodus annularis	6	13.4	8.95	M		10.5	10.3	10.53
				F		10.6	12.8	10.02
				M+F
						Dulcic et al. (2011)	Soykan et al. (2015)	Taieb et al. (2012)
Diplodus vulgaris	6.3	13	8.62	M		18.5	13.37	13.64
				F	18.0	19.1	12.87	13.84
				M+F
						Kallianiotis et al. (2005)	Emre et al. (2010)	Alssalam et al. (2016)
Lithognathus mormyrus	9.1	15.6	12.35	M		16.21	17.8	14.15
				F		19.04	18.5	14.45
				M+F
						Mahmoud (2010)	Cetinic et al. (2002)
Oblada melanura	7.5	19	9.9	M		14.35	16.4
				F		14.75	17.5
				M+F
						Ali Ben Smida et al. (2006)	Coelho et al. (2010)	Metin et al. (2011)
Pagellus erythrinus	12.6	12.6	12.6	M		16.75	17.58	15.08
				F		15.32	17.29	11.3
				M+F
						Criscoli et al. (2006)	Paiva et al. (2016)	El-Etreby et al. (2015)
Sarpa salpa	9.3	14	10.94	M		19.5	24.5	21.1
				F			28.6	28.5
				M+F
Parablennius sanguinolentus	8.2	12.4	10.42				No available data
Coris julis	11.1	11.8	11.9				No available data
Thalassoma pavo	12	16.9	13.9				No available data
Chromis chromis	6.5	11	8.52				No available data
Scorpaena maderensis	7.1	7.1	7.1				No available data
Lagocephalus sceleratus	17.3	17.3	17.3				No available data
Torquigener flavimaculosus	8.7	13.4	10.95				No available data
Lagocephalus suezensis	15.3	15.3	15.3				No available data

Projection of length–weight relationships in D_ vulgaris

Catch		Landing Projection
Catch		After maturation		After Minimum Landing Size
TL₁ (cm)	W₁ (g)	TL₂ (cm) (TL₁ + 6.7 cm)	W₂ (g)	TL₃ (cm) (TL₁ + 11.7 cm)	W₃ (g)
6.3	4.04	13	37.51	18	102.95
6.6	4.64	13.3	40.26	18.3	108.37
6.9	4.82	13.6	43.14	18.6	113.98
7.2	5.88	13.9	46.16	18.9	119.78
7.4	6.57	14.1	48.26	19.1	123.76
7.6	7.61	14.3	50.41	19.3	127.83
7.8	8.07	14.5	52.63	19.5	131.98
8.4	9.12	15.1	59.69	20.1	144.99
9.1	11.94	15.8	68.70	20.8	161.24
11.5	28.21	18.2	106.54	23.2	226.28
11.7	24.97	18.4	110.22	23.4	232.39
13	37.42	19.7	136.23	24.7	274.84
Total weight (g)	153.29		799.75		1868.40
S.D.	10.6		31.2		54.5
S.E.	2.9		8.7		15.1
			Catch (g)
1 angler/day	6.4		33.3		77.8
1 angler/weekend	12.8		66.6		155.7
1 angler/year	664.3		3465.6		8096.4
3 anglers/year	1992.8		10 396.7		24 289.1
25 anglers/year	16 606.4		86 639.3		202 409.5
50 anglers/year	33 212.8		173 278.6		404 818.9

Ratios of species in the angling catch in the Akyaka MPA

Family	Species	Weight (g)	Number (n)	Weight (%)	Number (%)	Importance
Balistidae	Balistes carolinensis	25.37	1	0.32	0.21	C
Blennidae	Parablennius sanguinolentus	102.43	6	1.30	1.23	NC
Gobiidae	Gobius niger	27.61	5	0.35	1.03	NC
Labridae	Coris julis	50.6	3	0.64	0.62	NC
Labridae	Thalassoma pavo	95.16	3	1.21	0.62	NC
Pomacentridae	Chromis chromis	1449.76	146	18.42	29.98	NC
Serranidae	Serranus scriba	96.95	2	1.23	0.41	C
Siganidae	Siganus luridus	88.17	4	1.12	0.82	C
	Siganus rivulatus	2462.71	94	31.29	19.30	C
	Boops boops	255.46	29	3.25	5.95	C
	Dentex dentex	92.81	1	1.18	0.21	C
	Diplodus sargus	203.68	11	2.59	2.26	C
	Diplodus annularis	1100.58	86	13.98	17.66	C
Sparidae	Diplodus vulgaris	153.29	12	1.95	2.46	C
	Lithognathus mormyrus	84.96	4	1.08	0.82	C
	Oblada melanura	266.52	18	3.39	3.70	C
	Pagellus erythrinus	31.36	1	0.40	0.21	C
	Sarpa salpa	890.36	48	11.31	9.86	C
Scorpaenidae	Scorpaena madarensis	6.95	1	0.09	0.21	C
Scorpaenidae	Lagocephalus sceleratus	54.09	1	0.69	0.21	NC
Tetraodontidae	Torquigener flavimaculosus	290.94	10	3.70	2.05	NC
Tetraodontidae	Lagecephalus suezensis	42.02	1	0.53	0.21	NC
Total		7871.78	487