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Journals / Turkish Journal of Zoology / 2008 / Cilt: 32 - Sayı: 1

Growth, Mortality, and Reproduction of Poor Cod (Trisopterus minutus Linn., 1758) in the Central Aegean Sea

Orta Ege Denizi Tavuk Bal›¤› (Trisopterus minutus Linn., 1758)’n›n Büyüme, Ölüm ve Üreme Özellikleri

Gülnur METİN
Akın Türker İLKYAZ
Hasan Tuncay KINACIGİL
Pages
43–51
Publication Date
2008-01-01
DOI
—
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AI Summary & Key Takeaways

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

This shows that the poor cod smaller than 14 cm must not be harvested and fishing should be prohibited from January to April and that the poor cod stock in the central Aegan Sea is being exploited at a slightly higher than the optimal level.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:A total of 1527 of poor cod (Trisopterus minutus Linn., 1758) were collected by trawl hauls between April 2001 and March 2002 from İzmir Bay (central Aegean Sea).
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Key Findings & Data:The size of the fish (total length) ranged from 10.6 cm (minimum, September) and 24.8 cm (April).
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Conclusion & Impact:This shows that the poor cod smaller than 14 cm must not be harvested and fishing should be prohibited from January to April and that the poor cod stock in the central Aegan Sea is being exploited at a slightly higher than the optimal level.
🔬Design:Research Article
📍Scope:2001 Verileri
⚙️Variables:Trisopterus minutus · yaş · büyüme

Abstract

A total of 1527 of poor cod (Trisopterus minutus Linn., 1758) were collected by trawl hauls between April 2001 and March 2002 from İzmir Bay (central Aegean Sea). The size of the fish (total length) ranged from 10.6 cm (minimum, September) and 24.8 cm (April). The population was composed of 53% males, 41% females, and 6% immature individuals, with a female to male ratio of 1:1.3. The age composition of the samples was from I to V. The von Bertalanffy growth parameters were L\infinity = 28.1 cm, W\infinity = 254.0 g, K = 0.26 y-1, and to = -1.52 y. The length at first sexual maturity was 13.3 cm in females and 12.5 cm in males. Spawning season begins in December and reaches its maximum level in January while continuing April. Fecundity ranged from 1236 to 21,463 eggs/female and showed significant correlation with fish length and weight. The total (Z), natural (M), and fishing mortality (F) rates, and the exploitation ratio (E) for all individuals were estimated respectively as Z = 0.82, M = 0.38, F = 0.44, and E = 0.57 y-1. This shows that the poor cod smaller than 14 cm must not be harvested and fishing should be prohibited from January to April and that the poor cod stock in the central Aegan Sea is being exploited at a slightly higher than the optimal level.

Özet

Trol çekimleri ile 1.527 adet tavuk bal›¤› (Trisopterus minutus Linn., 1758) Nisan 2001 ile Mart 2002 tarihleri aras›nda ‹zmir Körfezi’nden (Orta Ege Denizi) örneklenmifltir. Örneklenen bireylerin total boylar›n›n 10,6 cm (minimum, Eylül) ile 24,8 cm (Nisan) aras›nda da¤›l›m gösterdi¤i gözlenmifltir. Bireylerin %53’ünün erkek, %41’inin difli ve %6’s›n›n efleysel olgunlu¤a ulaflmam›fl bireylerden olufltu¤u tespit edilmifltir. Stokdaki difli:erkek oran›n›n 1:1,3 oldu¤u ve bireylerin I-V yafllar› aras›ndaki da¤›l›m gösterdi¤i gözlenmifltir. Von Bertalanffy büyüme parametreleri; L∞ = 28,1 cm, W∞ = 254,0 gr, K = 0,26 y›l–1 ve to = –1,52 y›l olarak hesaplanm›flt›r. Diflilerde ilk üreme boyunun 13,3 cm, erkeklerde ise bu boyun 12,5 cm oldu¤u bulunmufltur. Yumurtlaman›n Aral›k ay›nda bafllad›¤›, Ocak ay›nda maksimum seviyeye ulaflt›¤› ve Nisan ay›na kadar sürdü¤ü gözlenmifltir. Yumurta verimlili¤inin 1,236 ile 21,463 yumurta/difli aras›nda oldu¤u ve bu verimin bal›k boyu ve a¤›rl›¤› ile iliflkili oldu¤u tespit edilmifltir. Stoktaki toplam (Z), do¤al (M) ve bal›kç›l›ktan gelen ölüm (F) ile sömürülme oranlar› (E) s›ras› ile Z = 0,82, M = 0,38, F = 0,44 ve E = 0,57 y›l–1 olarak hesaplanm›flt›r. Elde edilen bilgiler ›fl›¤›nda, tür için minimum avlama boyunun 14 cm, av sezon yasa¤›n›n Ocak ile Nisan aylar› aras›nda olmas› önerilmektedir. Sömürülme oran› dikkate al›nd›¤›nda, stok üzerindeki av bask›s›n›n normalin biraz üzerinde gerçekleflti¤i gözlenmektedir.

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Cite This Article

METİN, G., İLKYAZ, A. T., KINACIGİL, H. T. (2008). Growth, Mortality, and Reproduction of Poor Cod (Trisopterus minutus Linn., 1758) in the Central Aegean Sea. Turkish Journal of Zoology, Cilt: 32 - Sayı: 1, 43–51. https://ajindex.com/articles/177702

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References (8)

  1. Bagenal, T.B. 1978. Fecundity. In: Methods for assessment of fish production in fresh waters (ed. T.B. Bagenal). IBP Handbook No: 3, Blackwell Scientific, London, 166-178.
  2. Biagi, F., De Raineri, S. and Viva, C. 1992. Recruitment, length at first maturity and feeding of poor-cod, Trisopterus minutus capelanus in the northern Tyrrhenian Sea. Boll. Zool. 59: 87-93.
  3. Blaxter, J.H.S. 1969. Development: Eggs and larvae. In: Fish Physiology, Reproduction, Growth, Bioluminescence, Pigments and Poisons (ed. W.S. Hoar and D.J. Randal), vol 3, Academic Press,
  4. New York and London. Cohen, D.M., Inada, T., Iwamoto, T. and Scialabba, N. 1990. FAO species catalogue. Vol. 10. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date. FAO Fish. Synop. 10:442. Cubillos, L.A. 2003. An approach to estimate the natural mortality rate in fish stock. Naga, WorldFish Center Quarterly, 26: 17-19.
  5. Erdoğan, O., Türkmen, M. and Yıldırım, A. 2002. Studies on the age, growth and reproduction characteristics of the chub, Leuciscus cephalus orientalis, (Nordmann, 1840) in Karasu River, Turkey. Turk J. Vet. Anim. Sci., 26: 983-991.
  6. Fischer, W., Schneider, M. and Bauchot, M.L. 1987. Mediterrance et Mer Noire. Zone de Peche 37, vol. II, Vertebres, FAO, Rome. Froglia, C. 1981. Summary of biological parameters on Trisopterus minutus capelanus (Risso) in the Adriatic. FAO Fish. Rep. 253, pp. 97-100.
  7. Giannetti, G. and Gramitto, E. 1988. Growth of poor cod Trisopterus minutus capelanus (Lacepede) (Pisces, Gadidae) in the Central Adriatic Sea. Rapp. Comm. Int. Mer. Médit., 31: 266. Gulland, J.A. 1971. The fish resources of the oceans. Fishing News Ltd., West Byfleet, Surrey, UK. Gunderson, D.R. 1993. Surveys of Fisheries Resources. John Wiley&Sons, Inc. N.Y. Holden, M.J. and Raitt, D.F.S. 1974. Manual of fisheries science. Part: 2. Methods of resource investigation and their application. FAO Fish. Tech. Rap. (115): Rev. 1, 214 pp. İlkyaz, A.T., Metin, C. and Kınacıgil, H.T. 1998. A computer program about the calculation of the selectivity parameters in towed fishing gear illustrated with cover cod-end method (L50 Version: 1.0.0). E.U. J. Fish. & Aquat. Sci., 15: 305-314.
  8. Jennings, S., Greenstreet, S.P.R. and Reynolds, J.D. 1999. Structural change in an exploited fish community: a consequence of differential fishing effects on species with contrasting life histories. J. Animal Ecol. 68: 617-627. Jensen,