Abstract
This study provides the first data on the length–weight relationship (LWR), length–length relationship (LLR), and condition factor (K) of the Malabar glassy perchlet, Ambassis dussumieri, in the northeastern Mediterranean (Tuzla coast, Türkiye). A total of 132 specimens (68 males and 64 females) were examined. The specimens ranged from 4.5 to 8.9 cm in total length (TL), 3.7 to 7.7 cm in fork length (FL), 3.4 to 6.9 cm in standard length (SL) for both sexes. The calculated b values indicated positive allometric growth for the overall population (t-test, p < 0.05). The length–length relationships among the three length measurements (TL, FL, and SL) were highly correlated (r2 > 0.970). The mean condition factor (K) was calculated as 0.812 ± 0.074 for both sexes, with no significant difference between females and males. These results will be useful for studies on the biology of non-indigenous fish species.
References
Afrand, M. & I. Sourinejad (2023): Morphological identification and DNA barcoding confirm the discovery of Ambassis dussumieri (Ambassidae) in the Persian Gulf. J. Ichthyol., 63, 1072-1079.
Anderson, M.E. & P.C. Heemstra (2003): Review of the glassfishes (Perciformes: Ambassidae) of the Western Indian Ocean. Cybium, 27(3), 199-209.
Avsar, D. (2016): Fisheries Biology and Population Dynamics (in Turkish). Akademisyen Publishing, Ankara, Turkey, 148 pp.
Bakhshalizadeh, S., K. Abbasi, A.R. Liafuie & F. Tiralongo (2025): Evidence for reducing fitness and competition of the native fish with invasive fish species in the south Caspian Sea. Mar. Environ. Res., 212, 107566.
Bagenal, T.B. & F.W. Tesch (1978): Age and growth. In: Bagenal, T. (ed.): Methods for Assessment of Fish Production in Fresh Waters, 3rd ed. IBP Handbook No. 3. Blackwell Scientific Publications, Oxford, 101-136.
Çevik, C. & D. Ergüden (2026): First record of Ambassis dussumieri Cuvier, 1828 (Osteichthyes: Ambassidae), in the North-Eastern Mediterranean, Türkiye. Zool. Middle East, 72, in press. https://doi.org/10.1080/09397140.2026.2684418.
Froese, R. (2006): Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendations. J. Appl. Ichthyol., 22(4), 241-253.
Froese, R.D. & D. Pauly (2026): FishBase. World Wide Web electronic publication. www.fishbase.org. Version 11/2025 [accessed 25 February 2026].
González Acosta, A.F., G. De La Cruz Agüero & J. De La Cruz Agüero (2004): Length-weight relationships of fish species caught in a mangrove swamp in the Gulf of California (Mexico). J. Appl. Ichthyol., 20(2), 154-155.
Le Cren, E.D. (1951): The length-weight relationship and seasonal cycle in the gonad weight and condition in the perch (Perca fluviatilis). J. Anim. Ecol., 20, 201-219.
Maugé, L.A. (1986): Ambassidae. In: Daget, J., J.P. Gosse & D.F.E. Thys van den Audenaerde (eds.): Check-list of the Freshwater Fishes of Africa (CLOFFA). Vol. 2. ISNB, Brussels; MRAC, Tervuren; ORSTOM, Paris, 297-298.
Moutopoulos, D.K. & K.I. Stergiou (2002): Length-weight and length-length relationships of fish species from the Aegean Sea (Greece). J. Appl. Ichthyol., 18(3), 200-203.
Pauly, D. (1980): Some Simple Methods for the Assessment of Tropical Fish Stocks. FAO Fisheries Technical Paper, 51. FAO, Rome, 234 pp.
Ricker, W.E. (1975): Computation and Interpretation of Biological Statistics of Fish Populations. Bulletin of the Fisheries Research Board of Canada, No. 191. Ottawa, Canada, 382 pp.
Sokal, R. & F. Rohlf (1987): Introduction to Biostatistics. Freeman, New York, USA, 363 pp.
Sparre, P. & S.C. Venema (1992): Introduction to Tropical Fish Stock Assessment: Part I. Manual. FAO Fisheries Technical Paper No. 306.1. FAO, Rome, Italy, 337 pp.
Stern, N., K. Gayer & A. Morov (2022): A transparent invasion: a first Mediterranean record and an established population of the glassfish Ambassis dussumieri Cuvier 1828. Mediterr. Mar. Sci., 23(1), 191-195.
Wootton, R.J. (1998): Ecology of Teleost Fishes. 2nd ed. Kluwer Academic Publishers, Dordrecht, Boston, 386 pp.
Zar, J.H. (1996): Biostatistical Analysis. 3rd ed. Prentice-Hall, Englewood Cliffs, NJ, 662 pp.

This work is licensed under a Creative Commons Attribution 4.0 International License.

