TY  - JOUR
T1  - An investigation of the length-weight relationship for 13 fish species on the eastern coast of Libya in the Mediterranean Sea
TT  - Akdeniz'de Libya'nın doğu kıyısındaki 13 balık türü için boy-ağırlık ilişkisinin incelenmesi
AU  - Alfergani, Eman Salem
AU  - El-mabrok, Mohammad
PY  - 2025
DA  - September
Y2  - 2025
DO  - 10.12714/egejfas.42.3.06
JF  - Ege Journal of Fisheries and Aquatic Sciences
JO  - EgeJFAS
PB  - Ege University
WT  - DergiPark
SN  - 2148-3140
SP  - 241
EP  - 247
VL  - 42
IS  - 3
LA  - en
AB  - We estimated the length–weight relationships (LWRs) for 13 marine fish species from the eastern coast of Libya in the Mediterranean Sea. A total of 325 specimens were collected from four different locations. The LWR parameters (a and b) were determined using the power function model: TW=aTLb. The regression coefficient b ranged from 2.182 (95% CI:1.607–2.689) in Siganus rivulatus to 3.328 (95% CI:2.700–3.955) in Chelon saliens. The coefficient of determination (r²) varied between 0.52 and 0.99. Most species exhibited isometric growth patterns, except for Siganus rivulatus, Sparisoma cretense, and Sardinella aurita, which showed negative allometric growth. These findings contribute valuable baseline data to support fisheries management and conservation efforts in the region.
KW  - Length-weight parameters
KW  - marine fishes
KW  - growth pattern
KW  - Libya coast
N2  - Akdeniz'deki Libya'nın doğu kıyısındaki 13 deniz balığı türü için boy-ağırlık ilişkilerini (LWR) hesapladık. Dört farklı lokasyondan toplam 325 örnek toplandı. LWR parametreleri (a ve b), güç fonksiyon modeli kullanılarak belirlendi: TW=aTLb. Regresyon katsayısı b, Siganus rivulatus türünde 2,182 (95% CI:1,607-2,689) ile Chelon saliens türünde 3,328 (95% CI:2,700-3,955) arasında değişti. Belirleme katsayısı (r²) 0,52 ile 0,99 arasında değişti. Negatif allometrik büyüme gösteren Siganus rivulatus, Sparisoma cretense ve Sardinella aurita hariç çoğu tür izometrik büyüme sergiledi. Bu bulgular, bölgedeki balıkçılık yönetimi ve koruma çabalarını desteklemek için değerli temel veriler sağlamaktadır.
CR  - Abdelhak, M. El Ganainy E. A., Madkour, A., F. Abu El-Regal, F. A., & Ahmed, M.I. (2020). Comparative study on morphometric relationships and condition factor of Siganus rivulatus inhabits the Red Sea, Suez Canal and the Mediterranean Sea, Egypt. Egyptian Journal of Aquatic Biology and  Fisheries, 24(7), 955 972. https://doi.org/10.21608/ejabf.2020.131399
CR  - Akel, E. (2009). Fisheries of experimental purse seine net using light and population dynamics of Sardinella aurita (Family Clupeidae) east of Alexandria, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 13(1), 55-77. http://doi.org/10.21608/ejabf.2009.2023
CR  - Aydın, M., & Bengil, E.G.T. (2020). Feeding habits and length-weight relationships Sciaena umbra Linnaeus, 1758 from Southern Black Sea. Acta  Aquatica Turcica, 16(4), 479 486. https://doi.org/10.22392/actaquatr.714094
CR  - Bagenal, T.B. & Tesch, F.W. (1978). Age and Growth In: T. Bagenal (Ed.), Methods for Assessment of Fish Production in Fresh Waters. IBp handbook No.3 (3rd), Blackwell Sci. Publications, Oxford. PP. 101-136.
CR  - Baidoo, K., Asare, N.K., & Abobi, S.M. (2022). Length-weight relationship and the condition factor of some important estuarine fish species from Kakum Estuary of Ghana. Ghana Journal of Science Technology and Development, 8(2), 2343–6727. https://doi.org/10.47881/344.967x
CR  - Bayhan, B., Taylan, B., & Heral, O. (2022). Length-weight and length-length relationships of the Scorpaena species (Actinopteri: Scorpaenidae) in Izmir Bay (Aegean Sea of Turkey). Acta Natura et Scientia, 3(1), 51–58. https://doi.org/10.29329/actanatsci.2022.351.06
CR  - Bazairi, H., Sghaier, Y., Benamer, I., Langar, H., Pergent, G., Bouras, E., Verlaque, M., Soussi, J., & Zenetos, A. (2013). Alien marine species of Libya: first inventory and new records in El-Kouf National Park (Cyrenaica) and the neighbouring areas. Mediterranean Marine Science, 14(2), 451–462. https://doi.org/10.12681/mms.555
CR  - Beğburs, C.R., & Kebapçıoğlu, T. (2013). Length-weight relationships for alien fish species caught by demersal trammel nets in the Gulf of Antalya (NE Mediterranean Sea, Turkey). Memba Kastamonu Üniversitesi Su Ürünleri Fakültesi Dergisi, 1(2), 41–43.
CR  - Bilge, G., Yapıcı, S., Filiz, H., & Cerim, H. (2014). Weight-length relations for 103 fish species from the Southern Aegean Sea, Turkey. Acta Ichthyologica et Piscatoria, 44(3), 263–269.
CR  - Bodur, B., Aydın, M., & Karadurmuş, U. (2023). Population structure, exploitation status, and prospects of brown meagre Sciaena umbra Linnaeus, 1758 from the Turkish coast of the Black Sea. Marine Science and  Technology  Bulletin, 12(1), 1 11. https://doi.org/10.33714/masteb.1178161
CR  - Cherif, M., Zarrad, R. Gharbi, H. Missaoui, H.& Jarboui, O. (2008). Length-weight relationships for 11 fish species from the Gulf of Tunis (SW Mediterranean Sea, Tunisia). Pan-American Journal of Aquatic Sciences, 3(1),1-5.
CR  - Čikeš Keč, V., & Zorica, B. (2012). Length–weight relationship, age, growth and mortality of Atlantic chub mackerel Scomber colias in the Adriatic Sea. Journal of the Marine Biological Association of the United Kingdom, 93(2), 341–349. https://doi:10.1017/s0025315412000161
CR  - Dahel, A., Tahri, M., Bensouilah, M., Amara, R., & Djebar, B. (2016). Growth, age and reproduction of Sardinella aurita (Valenciennes, 1847) and Sardina pilchardus (Walbaum, 1792) in the Algerian eastern coasts. AACL Bioflux, 9(5). http://www.bioflux.com.ro/aacl
CR  - Dars, B.A., Narejo, N.T., Dayo, A. (2010). Relative condition factor and length-weight relationship of a carp, Labeo gonius (Hamilton) from Keenjhar Lake, district Thatta, Sindh, Pakistan. Sindh University Research Journal, 42, 67-70
CR  - De Giosa, M., Czerniejewski, P., & Rybczyk, A. (2014). Seasonal changes in condition factor and weight-length relationship of invasive Carassius gibelio (Bloch 1782) from Leszczynskie Lakeland, Poland. Advances in Zoology, 678763. http://dx.doi.org/10.1155/2014/678763
CR  - Elbaraasi, H. (2014). Length-Weight Relationships for Five Lessepsian Fish Species from the Coast of Benghazi, Libya (Southern Mediterranean). Agriculture, Forestry  and  Fisheries, 3(3), 178 180. https://doi.org/10.11648/j.aff.20140303.16
CR  - Elbaraasi, H., Elabar, B., Elaabidi, S., Bashir, A., Elsilini, O., Shakman, E., & Azzurro, E. (2019). Updated checklist of bony fishes along the Libyan coasts (Southern Mediterranean Sea). Mediterranean Marine Science, 20(1), 90–105. https://doi.org/10.12681/mms.1557
CR  - Falsone, F., Geraci, M.L., Scannella, D., Gancitano, V., Di Maio, F., Sardo, G., Quattrocchi, F., & Vitale, S. (2022). Length-weight relationships of 52 Species from the South of Sicily (Central Mediterranean Sea). Fishes, 7(2), 92. https://doi.org/10.3390/fishes7020092
CR  - Flura, M.Z., Rahman, B.S., Rahman, M.A., Ashraful, M., Alam, M., & Pramanik, M.H. (2015). Length-weight relationship and GSI of hilsa, Tenualosa ilisha (Hamilton 1822) fishes in Meghna River, Bangladesh. International Journal of Natural and Social Sciences, 2(3):82–88.
CR  - Froese, R. (2006). Cube law, condition factor and weight–length relationships: history, meta‐analysis and recommendations. Journal of Applied Ichthyology, 22(4), 241 253. https://doi.org/10.1111/j.1439 0426.2006.00805.x
CR  - Giacalone, V.M., D’anna, G., Badalamenti, F., & Pipitone, C. (2010). Weight‐length relationships and condition factor trends for thirty‐eight fish species in trawled and untrawled areas off the coast of northern Sicily (Central Mediterranean Sea). Journal of Applied Ichthyology, 26(6):954–957. https://doi.org/10.1111/j.1439-0426.2010.01491.x
CR  - Golani, D., B. Ozturk and N. Basusta. (2006). Fishes of the Eastern Mediterranean. Turkish Marine Research Foundation, Istanbul, Turkey.
CR  - Gonçalves, J. M. S., Bentes, L., Lino, P. G., Ribeiro, J., Canario, A. V. M. & Erzini, K. (1997). Weight-length relationships for selected fish species of the small-scale demersal fisheries of the south and south-west coast of Portugal. Fisheries  Research, 30, 253 256. https://doi.org/10.1016/S0165-7836(96)00569-3
CR  - Ighwela, K.A., Ahmed, A.B., Abol-Munafi, A. (2001). Condition factor as an indicator of growth and feeding intensity of Nile tilapia fingerlings (Oreochromis niloticus) feed on different levels of maltose. American-Eurasian Journal of Agricultural & Environmental Science, 11(4), 559–563.
CR  - Jisr, N., Younes, G. Sukhn, C. Mohammad, H.&El-Dakdouki, M.H. (2018). Length-weight relationships and relative condition factor of fish inhabiting the marine area of the Eastern Mediterranean city, Tripoli-Lebanon. Egyptian Journal of Aquatic Research, 44, 299–305.
CR  - Jurado-Ruzafa, A., Hernández, E., & Santamaría, M.T.G. (2017). Age, growth and natural mortality of Atlantic chub mackerel Scomber colias Gmelin 1789 (Perciformes: Scombridae), from Mauritania (NW Africa). Vieraea, 45, 53-64. http://dx.doi.org/10.31939/vieraea.2017.45.03
CR  - Kalteh, Y. (2023). Study of some growth characteristics of leaping mullet (Chelon saliens) in the mouth of Gorgan Bay - Southeast of the Caspian Sea (Ashuradeh). Journal of Utilization and Cultivation of Aquatics, 11(4), 23–31.
CR  - Kapiris, K. & Klaoudatos, D. (2011). Length-weight relationships for 21 fish species caught in the Argolikos Gulf (central Aegean Sea, eastern Mediterranean). Turkish Journal of Zoology, 35(5), 11. https://doi.org/10.3906/zoo-1003-122
CR  - Karadurmuş, U., Aydın, M. (2023). Length–weight relationships of 19 marine fish species from the Southern Coast of Black Sea Associated with Small-Scale Fisheries. Thalassas, 39, 111–114. https://doi.org/10.1007/s41208-023-00524-x
CR  - Kassah, J.E. (2020). Aspects of the biology and length-based assessment of the chub mackerel Scomber colias (Scombridae) stock off the coast of Ghana. University of Cape Coast.
CR  - Kelly, B., Smokorowski, K.E., Power, M. (2017). Growth, condition and survival of three forage fish species exposed to two different experimental hydropeaking regimes in a regulated river. River Research and Applications, 33(1), 50–61. https://doi.org/10.1002/rra.3070
CR  - Kondylatos, G., Kallias, I., Vafidis, D., Exadactylos, A., Theocharis, A., Mavrouleas, D., Kalaentzis, K., Avgoustinaki, M., Conides, A., & Klaoudatos, D. (2024). The length-weight relationship of indigenous and non-indigenous fish species from the small-scale fisheries of Rhodes, Greece. International Aquatic Research, 16(2), 169–185. https://doi:10.22034/iar.2024.2008347.1612
CR  - Kuriakose, S. (2014). Estimation of length weight relationship in fishes. Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management. Reprinted from the CMFRI, FRAD. Training Manual on FishStock Assessment and Management, p.150
CR  - Mehanna, S.F., & Farouk, A.E. (2021). Length-weight relationship of 60 fish species from the Eastern Mediterranean Sea, Egypt (GFCM-GSA 26). Frontiers  Marine  Science, 8:625422. http://doi:10.3389/fmars.2021.625422
CR  - Mendes, B., Fonseca, P., & Campos, A. (2004). Weight-length relationships for 46 fish species of the Portuguese west coast. Journal of Applied Ichthyology, 20(5), 355 361. http://doi:10.1111/j.1439 0426.2004.00559.x
CR  - Morato, T., Afonso, P., Lourinho, P., Barreiros, J. P., Santos, R. S., & Nash, R. D. M. (2001). Length–weight relationships for 21 coastal fish species of the Azores, north-eastern Atlantic. Fisheries Research, 50(3), 297–302. https://doi:10.1016/s0165-7836(00)00215-0
CR  - Moutopoulos, D.K., & Stergiou, K.I. (2002). Length–weight and length–length relationships of fish species from the Aegean Sea (Greece). Journal of Applied Ichthyology, 18(3), 200–203. https://doi.org/10.1046/j.1439-0426.2002.00281.x
CR  - Moyle, P.B. & Cech, J.J. (2004). Fishes: An Introduction to Ichthyology, 5th ed. Pearson Prentice Hall, New Jersey, USA. 127 pp.
CR  - Olim, S., & Borges, T. C. (2006). Weight-length relationships for eight species of the family Triglidae discarded on the south coast of Portugal. Journal of Applied Ichthyology, 22(4), 257–259. https://doi:10.1111/j.1439-0426.2006.00644.x
CR  - Özdemir, S., Özsandıkçı, U., & Büyükdeveci, F. (2019). A new maximum length with length–weight relationship of tub gurnard (Chelidonichthys lucerna Linnaeus, 1758) from Central Black Sea Coasts of Turkey. Marine Science and Technology Bulletin, 8(2), 85–91.
CR  - Özvarol, Y. (2014). Length-weight relationships of 14 fish species from the Gulf of Antalya (northeastern Mediterranean Sea, Turkey). Turkish Journal of Zoology, 38(3), 342-346. https://doi.org/10.3906/zoo-1308-44
CR  - Ragheb, E. 2023. Length-weight relationship and well-being factors of 33 fish species caught by gillnets from the Egyptian Mediterranean waters off Alexandria, Egyptian Journal of Aquatic Research, 49(3), 361–367. https://doi.org/10.1016/j.ejar.2023.01.001
CR  - Reis, İ., & Ateş, C. (2019). Length-weight, length-length relationships and condition factor of grey mullet species from Köyceğiz Lagoon in Turkey. Acta  Aquatica  Turcica, 15(4), 411 417. https://doi.org/10.22392/actaquatr.540983
CR  - Ricker, W.E. 1975. Computation and interpretation of biological statistics of fish populations. Bulletin of the Fisheries Research Board of Canada 191: 1–382.
CR  - Rodríguez-García, C., Castro-Gutiérrez, J., Domínguez Bustos, Á.R., García-González, A., & Cabrera-Castro, R. (2023). Every fish counts: Challenging length–weight relationship bias in discards. Fishes, 8, 222. https://doi.org/10.3390/fishes8050222
CR  - Rodríguez-García, C., Toro-Podadera, A., Sarmiento Carbajal, J., Cabrera-Castro, R. (2024). Coexisting in the surf zone: Age and feeding habits of the spotted seabass (Dicentrarchus punctatus) and European seabass (Dicentrarchus labrax) on the Gulf of Cádiz beaches (Southwest Iberian Peninsula). Fishes, 9, 173. https://doi.org/10.3390/fishes9050173
CR  - Schneider, J.C., Laarman, P.W., & Gowing, H. (2000). Length-weight relationships. In: James C (Ed). Manual of fisheries survey methods II: with periodic updates (pp. 1–16). University of Michigan Library Digital Collections. Accessed August 28, 2025.
CR  - Şen, Y., Daban, İ.B., Öztekin, A., Ayaz, A., Altınağaç, U., İşmen, A., Yüksek, A., Özekinci, U., Çakır, F., Demirkiran, T., Uğur, G. E., Ayaz, O., & Selçuk, B. B. (2024). The length-weight relationship and condition factors of coastal small sized adult and juvenile fish species following dense mucilage in the Sea of Marmara, Türkiye. Turkish Journal of Zoology, 48(2), 104–112. https://doi.org/10.55730/1300-0179.3165
CR  - Serena, F., Voliani, A., & Auteri, R. (1998). Nursery areas and some biological information of tub gurnard (Trigla lucerna L., 1758) off Tuscany coast (Italy). Rapp. Comm. Int. Mer. Mediterranean, 35, 482–483.
CR  - Shakman, E.A. (2008). Lessepsian migrant fish species of the coastal waters of Libya: Status, biology, ecology (M.Sc. Thesis), Rostock University, Germany. http://rosdok.unirostock.de/file/rosdok_disshab_0000000120/rosdok_derivate_0000003661/Di ssertation_Shakman_2008
CR  - Sinovcic, G., Franicevic, M., Zorica, B., & Cikes-Kec, V. (2004). Length-weight and length-length relationships for 10 pelagic fish species from the Adriatic Sea (Croatia). Journal of Applied Ichthyology, 20(2), 156–158. http://doi:10.1046/j.1439-0426.2003.00519.x
CR  - Sokal, R. R. & Rohlf. F.J. (1987). Introduction to Biostatistics. Freeman, New York, USA. 374 pp.
CR  - Taskavak, E., & Bilecenoglu, M. (2001). Length-weight relationships for 18 Lessepsian (Red Sea) immigrant fish species from the eastern Mediterranean coast of Turkey. Journal of the Marine Biological Association  of  the U.K., 81, 895 896. http://dx.doi.org/10.1017/S0025315401004805
CR  - Techetach, M., Kouali, H., Achtak, H., Rafiq, F., Lemhadri, A., Dahbi, A., Ajana, R., & Saoud, Y. (2021). Age, growth and mortality of Atlantic chub mackerel, Scomber colias Gmelin, 1789 in the Mediterranean waters of Morocco. International Journal of Aquatic Biology, 9(5), 268–278. https://doi.org/10.22034/ijab.v9i5.1033
CR  - Türker, D., Zengin, K., & Bal, H. (2020). Length-weight relationships of 11 lessepsian migrant fish species caught from Antalya Bay (Turkey). Acta Aquatica  Turcica, 16(2), 301 304. https://doi.org/10.22392/actaquatr.670648
CR  - Uğur, G.E., & Öztekin, A. (2024). Determination of the length-weight relationship and otolith biometry characteristics of Scorpaena scrofa (Linnaeus, 1758) in the Çanakkale region. Fish COMU Journal of Marine Sciences and Fisheries, 7(1), 86–95. https://doi:10.46384/jmsf.1501498
CR  - Vallisneri, M., Montanini, S., & Stagioni, M. (2010). Length-weight relationships for the family Triglidae in the Adriatic Sea, northeastern Mediterranean. Journal  of  Applied  Ichthyology, 26(3), 460 462. https://doi:10.1111/j.1439-0426.2009.01389.x
CR  - Verdiell-Cubedo, D., Oliva-Paterna, F.J., & Torralva, M. (2006). Length-weight relationships for 22 fish species of the Mar Menor coastal lagoon (western Mediterranean Sea). Journal of Applied Ichthyology, 22(4), 293–294. https://doi:10.1111/j.1439-0426.2006.00738.x
CR  - Vieira, R.P., Monteiro, P., Ribeiro, J., Bentes, L., Oliveira, F., Erzini, K., & Gonçalves, J.M. (2014). Length-weight relationships of six syngnathid species from Ria Formosa, SW Iberian coast. Cahiers de Biologie Marine, 55, 9–12.
UR  - https://doi.org/10.12714/egejfas.42.3.06
L1  - https://dergipark.org.tr/en/download/article-file/4880462
ER  -