SavedAdd your journal

Journals / Natural and Engineering Sciences / 2021 / Cilt: 6 - Sayı: 3

Diel Variability in the Bottom-Trawl Catch Rates of Sparid Fishes in İzmir Bay (Central-Eastern Aegean Sea)

Aydın ÜNLÜOĞLU
Pages
138–154
Publication Date
2021-12-15
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Information on diel variations obtained in this study could be fundamental in understanding the distribution dynamics of the five sparid fishes and developing future management approaches.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Time of day may affect the availability, distribution and behaviour of many fishes, at least in the depths that the light penetrates.
📊
Key Findings & Data:Changes in the activity and position of the demersal fish as a response to the changing light levels during a diel (24 h) cycle may affect their catchability or vulnerability to the bottom trawl.
💡
Conclusion & Impact:Information on diel variations obtained in this study could be fundamental in understanding the distribution dynamics of the five sparid fishes and developing future management approaches.
🔬Design:Survey & Empirical Study
📍Scope:Comprehensive Sample
⚙️Variables:24 h cycle · time of day · diel periodicity

Abstract

Time of day may affect the availability, distribution and behaviour of many fishes, at least in the depths that the light penetrates. Changes in the activity and position of the demersal fish as a response to the changing light levels during a diel (24 h) cycle may affect their catchability or vulnerability to the bottom trawl. Diel variability in the bottom-trawl catch rates of five sparid fish species, namely Boops boops, Diplodus annularis, Diplodus vulgaris, Pagellus acarne and Pagellus erythrinus, were investigated during seven experimental bottom-trawl surveys conducted within the same locality in İzmir Bay. All trawl haulings were performed using the same operation and sampling procedure and carried out for each seasonal survey at different periods day, including the morning, noon, afternoon, dusk, early-night, midnight, late-night and dawn. Percentage contribution by weight of the sparid fishes to the total catch varied according to the sampling season between 23-79%. Catch rates of the sparid fishes usually did not show significant diel periodicity except D. vulgaris. Daylight catch rates of D. vulgaris were significantly higher than twilight and night periods (Daylight>Twilight>Night). Information on diel variations obtained in this study could be fundamental in understanding the distribution dynamics of the five sparid fishes and developing future management approaches.

🔖

Cite This Article

ÜNLÜOĞLU, A. (2021). Diel Variability in the Bottom-Trawl Catch Rates of Sparid Fishes in İzmir Bay (Central-Eastern Aegean Sea). Natural and Engineering Sciences, Cilt: 6 - Sayı: 3, 138–154. https://ajindex.com/articles/793134

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (11)

  1. Adlerstein, S., & Ehrich, S. (2003). Patterns in diel variation of cod catches in North Sea bottom trawl surveys. Fisheries Research, 63, 169-178.
  2. Carpentieri, P., Colloca, F., & Ardizzone, G.D. (2005). Day-night variations in the demersal nekton assemblage on the Mediterranean shelf-break. Estuarine, Coastal and Shelf Science, 63, 577-588.
  3. Cartes, J.E., Sarda`, F., Company, J.B., & Lleonart, J. (1993). Day-night migrations by deep-sea decapod crustaceans samplings in the Western Mediterranean sea. Journal of Experimental Marine Biology and Ecology, 171, 63-73.
  4. Casey, J.M., & Myers, R. (1998). Diel variation in trawl catchability: it is as clear as day and night? Canadian Journal of Fisheries and Aquatic Sciences, 55, 2329-2340.
  5. Colloca, F., Cardinale, M., Belluscio, A., & Ardizzone, G.D. (2003). Structure and diversity of demersal assemblages in the Central Mediterranean Sea. Estuarine, Coastal and Shelf Science, 56, 469-480.
  6. Dulcic, J., Fencil, M., Matić-Skoko, S., Kraljevic, M., & Glamuzina., B. (2004). Diel catch variations in a shallow-water fish assemblage at Duće Glava, eastern Adriatic (Croatian coast). Journal of the Marine Biological Association of the United Kingdom, 84, 659-664.
  7. Fischer, W., Bauchot, M., & Schneider, M. (1987). Fishes FAO d identification des species pour les besoms de la peche (Reuisision). Mediterranee et mer Noire. Zone de peche 37. Vol. II Vertebres. Public. prepare par la FAO, resultat d un accord entre la FAO et la Comission des Communeutes Europeanes conjointement par ces deux. Francis, M.P., & Williams, M.W. (1995). Diel variation in trawl catch rates of Pagrus auratus (Sparidae). Fisheries Research, 24, 301-310.
  8. Froese, R., & Pauly. D. (Editors). 2019. FishBase. World Wide Web electronic publication. www.fishbase.org, version (02/2019).
  9. Gaertner, J.C., Mazouni, N., Sabatier, R., & Millet, B. (1999). Spatial structure and habitat associations of demersal assemblages in the Gulf of Lions: a multicompartmental approach. Marine Biology, 135, 199-208.
  10. Gaertner, J.C., Bertrand, J.A., Samani, D., & Souplet, A. (2005). Spatio-temporal organization patterns of demersal assemblages of the east coast of Corsica (Mediterranean Sea). Vie et Milieu 55, 81-89. Godø, O.R. (1994). Factors affecting the reliability of groundfish abundance estimates from bottom trawl surveys. In: Fernö, A., Olsen, S. (Eds.), Marine Fish Behaviour in Capture and Abundance Estimation. Fishing News Books, Oxford, UK, pp. 166-199.
  11. Helfman, G.S. (1993). Fish