Length-weight relationships and condition factors of fish species in the Küçükçekmece Lagoon (NW Türkiye)

Fish species	N	a	b	95% CI (b) (min. - max.)	R2	Growth type	TL, cm (min. - max.)	W, g (min. - max.)	CF ± SD
Familia: Atherinidae A. pontica Eichwald, 1831	686	0.007	3.071	3.050–3.091	0.9703	A (+)	1.7–12.5	0.0304–17.6895	0.65 ± 0.07
Familia: Engraulidae E. encrasicolus (Linnaeus, 1758)	321	0.003	3.402	3.363–3.441	0.9581	A (+)	3.5–13.4	0.2025–20.0610	0.27 ± 0.03
Familia: Gobiidae N. melanostomus (Pallas, 1814)	77	0.006	3.454	3.321–3.587	0.9722	A (+)	3.3–9.5	0.4533–15.0240	0.65 ± 0.08
Familia: Mugilidae C. auratus (Risso, 1810)	78	0.006	3.135	3.008–3.261	0.9897	A (+)	3.6–28.2	0.1271–208.8800	0.65 ± 0.10
Familia: Oxudercidae K. caucasica (Berg, 1916)	51	0.007	3.263	3.107–3.419	0.9806	A (+)	1.7–4.2	0.0351–0.7135	2.00 ± 0.07

1 n: number of individuals, a and b: regression coefficients; 95% CI: 95% confidence interval for b; R²: coefficient of determination; Growth Type; A(+), positive allometric growth; CF, condition factor; TL, total fish length; W: total fish weight; SD, standard deviation.

Table 2

Relationships between total, FL and SL length for five fish species inhabited in Küçükçekmece Lagoon.

Species	n	FL = aTL - b			SL = aTL - b
Species	n	a	b	R²	a	b	R²
A. pontica	686	0.9248	–0.0354	0.9975	0.8582	0.0930	0.9973
E. encrasicolus	321	0.9169	0.0461	0.9970	0.8517	0.1159	0.9976
N. melanostomus	77	-	-	-	0.8699	0.3125	0.9932
C. auratus	78	0.8972	–0.3067	0.993	0.7966	–0.0514	0.9994
K. caucasica	51	-	-	-	0.9230	0.2517	0.9920

1 n: sample size; FL, fork length; SL, standard length; TL, total length, a, b, and R² are the parameters of linear regression analysis.

Table 3

LWR parameters (a and b) and CF reported in various studies across different water bodies.

Fish species	Locality	n	L, cm (min. -max.)	W, g (min. -max.)	A	b	CF	L	Reference
A. pontica	Küçükçekmece Lagoon	15	3.9–11.1	-	0.003	3.31	-	TL	Tarkan et al. (2006)
	Küçükçekmece Lagoon	900	3.50–11.0	-	0.0161	2.97	-	SL	Altun (1986)
	Homa Lagoon	172	3.7–9.9	0.32–6.30	0.0077	2.925	0.67 ± 0.071	TL	İlhan and İlhan (2018)
	Homa Lagoon	1640	2.4–10.3	-	0.0052	3.085	0.16–0.85 (min.-max.)	TL	Sezen (2005)
	Homa Lagoon	103	3.4–10.6	0.29–8.40	0.0070	2.963	-	TL	Acarlı et al. (2014)
	Yumurtalik Lagoon	82	3.6–6.3	0.24–1.7	0.004	3.302	-	TL	İnnal and Engin (2020)
	Bafa Lagoon	184	2.5–10.5	0.06–8.42	0.004	3.327	-	TL	İnnal and Engin (2020)
	Köyceğiz Lagoon	217	2.5–7.9	0.1–2.75	0.012	2.563	-	TL	İnnal and Engin (2020)
	Gediz Estuary	121	3.2–10.1	0.24–7.29	0.0073	2.985	-	TL	Kara et al. (2018)
	Beşgöz Estuary	14	3.2–5.6	0.18–1.13	0.003	3.412	-	TL	İnnal and Engin (2020)
	Kopak Estuary	14	5.2–7.4	0.87–2.38	0.008	2.825	-	TL	İnnal and Engin (2020)
	Köprüçay Estuary	14	4.3–6.8	0.5–2.7	0.005	3.169	-	TL	İnnal and Engin (2020)
	Ceyhan Estuary	154	3.6–7.2	0.1–2.3	0.007	2.987	-	TL	İnnal and Engin (2020)
	Çandarlı Bay/Aegean Sea	1558	1.00–9.40	0.004–5.59	0.0043	3.187	-	TL	Gürkan et al. (2010)
	Erdek Bay/Sea of Marmara	606	2.5–11.2	-	0.0045	3.215	-	TL	Keskin and Gaygusuz (2010)
	İzmir Bay/Aegean Sea	138	4.8–9.8	0.6–4.86	0.0048	3.165	-	FL	Özaydın and Taskavak (2006)
	Bursa Coast/Sea of Marmara	22	9.2–11.5	6.5–12.8	0.018	2.63	-	TL	İnnal and Engin (2020)
	Zonguldak Coast/Black Sea	43	6.7–10.6	2.4–10.5	0.007	3.098	-	TL	İnnal and Engin (2020)
	Istanbul Coast/Black Sea	55	7.1–9.6	2.4–6.9	0.009	2.87	-	TL	İnnal and Engin (2020)
	Rize Coast/Black Sea	93	8.6–12.5	3.9–12.4	0.006	3.041	-	TL	İnnal and Engin (2020)
	Çanakkale Coast/Aegean Sea	103	3.1–8.5	0.2–4.1	0.005	3.162	-	TL	İnnal and Engin (2020)
	Sea of Marmara	14	7.6–11.7	1.84–8.40	0.0015	3.485	-	TL	Bök et al. (2011)
	Ömerli Reservoir	442	7.7–12.9	-	0.0159	2.66	-	TL	Tarkan et al. (2006)
	Hirfanlı Reservoir	323	4.09–11.02	-	0.027	3.2376	0.621 ± 0.087	TL	Kırankaya et al. (2014)
	Demirköprü Reservoir	41	3.9–13.6	0.4–16.5	0.008	2.949	-	TL	İnnal and Engin (2020)
	Demirköprü Reservoir	101	6.61–10.48	1.84–8.98	0.0029	3.4227	-	TL	Güçlü and Küçük (2021)
	iznik Lake	1138	2.7–11.9	0.10–10.36	0.0032	3.3366	0.506–0.714 (min.-max.)	TL	Gaygusuz (2006)
	Sapanca Lake	381	3.2–10.8	0.20–7.58	0.0076	2.8575	0.586 ± 0.004	TL	İlhan et al. (2026)
	Gebekirse Lake	59	5.80–9.50	1.20–4.04	0.008	2.884	1.064 ± 0.206	TL	Kurtul et al. (2023)
	Eğirdir Lake	114	3.9–6.6	0.27–1.45	0.006	2.781	-	TL	İnnal and Engin (2020)
	Marmara Lake	101	3.70–8.70	0.40–5.40	0.0084	2.908	-	TL	İlhan and Sarı (2015)
	Marmara Lake	20	3.8–4.7	0.36–0.64	0.001	2.58	-	TL	İnnal and Engin (2020)
	Marmara Lake	19	5.93–7.44	1.37–2.66	0.0082	3.9208	-	TL	Güçlü and Küçük (2021)
	Marmara Lake	185	5.6–8.2	1.30–3.99	0.0059	3.118	0.75 ± 0.052	TL	İlhan and İlhan (2018)
E. encrasicolus	Homa Lagoon	68	7.0–11.3	2.32–9.35	0.0070	2.917	-	TL	Acarlı et al. (2014)
	İzmir Bay/Aegean Sea	212	9.2–13.9	3.6–16.5	0.0019	3.4207	-	TL	Şenbahar et al. (2020)
	İzmir Bay/Aegean Sea	513	10.5–14.9	9.09–23.62	0.0116	2.840	-	FL	Özaydın and Taskavak (2006)+
	Mersin Bay	630	4.3–13.7	0.39–17.87	0.0037	3.179	-	TL	Çiçek et al. (2006)
	North-Eastern Mediterranean	392	7.0–17.0	2.0–34.99	0.0156	2.661	-	TL	Sangun et al. (2007)
	Gökçeada Island/North Aegean	18	2.1–3.6	0.02–0.13	0.002	3.229	-	TL	Altın et al. (2015)
	Saros Bay	212	8.1–14.8	3.0–17.0	0.0052	2.9721	-	TL	Ismen et al. (2007)
	East Black Sea	19	6.2–13.5	1.72–13.64	0.0182	2.549	-	TL	Yeşilçiçek (2015)
	Middle Black Sea	575	8.0–14.7	2.85–19.14	0.0174	2.6014	-	TL	Kalaycı et al. (2007)
	Black Sea	83	6.6–11.2	1.2–5.53	0.0043	3.04	-	TL	Onay and Dalgıç (2021)
	Black Sea	10062	5.5–14.5	0.9–17.4	0.008	2.86	-	TL	Samsun et al. (2017)
	Black Sea	696	8.0–13.6	3.5–16.4	0.0180	2.6182	-	TL	Özdemir and Duyar(2013)
	Black Sea	1588	5.9–14.6	1.06–18.10	0.0124	2.711	-	TL	Kasapoğlu and Düzgüneş (2013)
	Black Sea	312	7.4–14.1	1.84–22.11	0.002	3.38	-	TL	Türker and Bal (2018)
N. melanostomus	Büyükçekmece Lake	22	6.8–9.8	-	0.0185	2.87	-	TL	Tarkan et al. (2006)
	Sapanca Lake	46	3.0–15.1	0.26–62.05	0.0065	3.3555	1.295 ± 0.030	TL	İlhan et al. (2026)
	Black Sea	169	9.0–24.6	8.83–250.34	0.069	3.24	-	TL	Onay and Dalgıç (2021)
	Black Sea	99	8.6–19.1	-	0.0047	3.39	-	TL	Demirhan and Can (2007)
	Black Sea	172	6.5–32.0	2.24–313.52	0.0114	3.088	-	TL	Kasapoğlu and Düzgüneş (2013)
	Black Sea	73	9.1–35.0	8.58–381.42	0.01	3.033	-	TL	Ak et al. (2009)
	Black Sea	58	9.0–26.0	8.0–265.0	0.0059	3.3062	-	TL	Çalık and Sağlam (2017)
	Black Sea	2408	10.50–26.20	15.28–212.20	0.0069	3.1972	-	TL	Aydın (2021)
C. auratus	Köyceğiz Lagoon	476	6.2–39.3	2.34–508.38	0.0087	2.96	0.56–1.30 (min.-max.)	TL	Reis and Ateş (2019)
	Köyceğiz Lagoon	589	13.1–47.3	13.40-1005.16	0.0075	2.9744	-	TL	Çiloğlu (2023)
	Homa Lagoon	119	15.4–25.5	39.00–173.90	0.0100	2.997	-	TL	Acarlı et al. (2014)
	Golden Horn (Istanbul)	431	13.4–46.8	-	0.0127	2.89	-	TL	Kesiktaş et al. (2020)
	Gediz Estuary	81	5.3–16.4	1.45–44.4	0.0091	3.035	-	TL	Kara et al. (2018)
	Black Sea	324	16.5–38.8	37.76–568.56	0.0158	2.8086	0.739–0.963 (min.-max.)	TL	Kartal et al. (2025)
K. caucasica	Eğirdir Lake	400	-	-	0.0129	2.8494	-	TL	Güçlü and Erdoğan (2017)
	Büyükçekmece Lake	6	2.2–3.4	-	0.0072	3.22	-	TL	Tarkan et al. (2006)

1 N: sample size; CF, condition factor; L, measured length type (TL, total length; FL, fork length; SL, standard length).

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Articles in this issue

DOI: https://doi.org/10.26881/oahs-2026.1.18 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X

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Language: English

Page range: 251 - 262

Submitted on: May 5, 2026

Accepted on: Jun 22, 2026

Published on: Jun 30, 2026

Published by: University of Gdańsk

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

allometric growth,

lagoon ecosystem,

fish population dynamics,

ecological monitoring,

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© 2026 Özgün Deniz Yürekli, İrem Şarlak, Harun İnci, Tuğçe Yetim, Sevan Ağdamar, Müfit Özuluğ, Gülşah Saç, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 55 (2026): Issue 2 (June 2026)

Length-weight relationships and condition factors of fish species in the Küçükçekmece Lagoon (NW Türkiye)

Figures & Tables

Figure 1

Table 1

Table 2

Table 3

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