Selectivity of gill nets for Solea solea (Osteichthyes: Soleidae) in the Adriatic Sea

Authors

  • Gianna Fabi CNR – Istituto di Scienze Marine (ISMAR)
  • Fabio Grati CNR – Istituto di Scienze Marine (ISMAR)

DOI:

https://doi.org/10.3989/scimar.2008.72n2253

Keywords:

Solea solea, gill nets, mesh selectivity, fishery management, fishery resources, Adriatic Sea

Abstract


Sole juveniles concentrate along the western Adriatic coast where they are targeted from spring to autumn by small-scale gill netters. As in spring–early summer 20 to 30% of catch biomass consists of individuals smaller than MLS (TL = 20 cm), the selectivity of sole gill nets was investigated in 2004-2005 in order to obtain useful information for developing management measures aimed at reducing the retention of undersized specimens and assuring the sustainability of this fishery. Twenty-eight fishing trips were performed using sole gill nets with 5 mesh openings (64.2, 65.2, 67.8, 70.2 and 71.8 mm) simultaneously. The gill net selectivity was estimated indirectly by applying the SELECT method and between-set analysis. The log-normal curve was found to fit single set data better than other models. The catch yields did not significantly decrease with the increment of mesh size: the biomass of undersized individuals in catches noticeably decreased from 16% down to 9% in the largest mesh size, whilst the sole that were longer than the MLS increased proportionally. In view of the lower economic value of smaller specimens with respect to the larger ones, adopting the 71.8 mm mesh represents a good compromise between the need to protect juveniles and the economic profit of gill netters.

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References

Baranov, F.I. – 1914. The capture of fish with gillnets. Mater. Poznaniyu Russ. Rybolov., 3(6): 56-99. (Partially translated from Russian by W.E. Ricker).

Baranov, F.I. – 1948. Theory of Fishing with Gillnets. In: Theory and assessment of fishing gear. Fish Industry Press, Moscow (Translation from Russian by Ontario Department of Lands and Forests, Maple, Ontario).

Borgstrøm, R. – 1989. Direct estimates of gillnet selectivity for roach (Rutilus rutilus) in a small lake. Fish. Res., 7: 289-298. doi:10.1016/0165-7836(89)90062-3

Borgstrøm, R. – 1992. Effects of population density on gillnet catchability in four allopatric populations of brown trout (Salmo trutta). Can. J. Fish. Aquat. Sci., 49: 1539-1545.

Constat. – 1998a. GILLNET Software. Hjoerring, Denmark.

Constat. – 1998b. EC-MODEL Software. Hjoerring, Denmark

Dempster, A.P., N.M. Laird and D.B. Rubin. – 1977. Maximum likelihood with incomplete data via the E-M algorithm. J. R. Stat. Soc. B., 39: 1-38.

Erzini, K., J.M.S. Gonçalves, L. Bentes, D.K. Moutopoulos, J.A. Hernando Casal, M.C. Soriguer, E. Puente, L.A. Errazkin and K.I. Stergiou. – 2006. Size selectivity of trammel nets in southern European small-scale fisheries. Fish. Res., 79: 183-201. doi:10.1016/j.fishres.2006.03.004

Ferretti, M. and C. Froglia. – 1975. Results of selectivity experiments, made with different trawls, on more important Adriatic demersal fish. Quad. Lab. Tecn. Pesca, 2(1): 3-16.

Fisher, W., M.L. Bauchot and M Schneider. – 1987. Fiches FAO d’identification des espèces pour les besoins de la pêche (Revisión 1) Méditerrané et mer Noire. Zone de pêche 37. Vol. 2. Vertébrées. Publication préparé par la FAO, résultant d’un accord entre la FAO et la Commission des Communautés Européennes (Project GCP/INT/422/ECC) financée conjointement par ces deux organisations. FAO, Rome.

Fonseca, P., R. Martins, A. Campos and P. Sobral. – 2005. Gillnet selectivity off the Portuguese western coast. Fish. Res., 73: 323–339. doi:10.1016/j.fishres.2005.01.015

Francesconi, B., M. Sbrana, I. Rossetti and S. De Ranieri. – 2005. Gillnet efficiency and selectivity in the exploitation of the common sole, Solea vulgaris (Quensel, 1806), in the eastern Ligurian Sea. Biol. Mar. Medit., 12(1): 522-525.

Fryer, R. – 1991. A model of the between-haul variation in selectivity. ICES J. Mar. Sci., 48: 281-290. doi:10.1093/icesjms/48.3.281

GFCM. – 2006. F.A.O. General Fishery Council for the Mediterranean. Report of the eighth Session of the Sub-Committee on Stock Assessment (SCSA). GFCM:SAC9/2006/Inf.8.

Grati, F., G. Fabi, A. Lucchetti and P. Consoli. – 2002. Analisi delle catture di Solea vulgaris Quensel, 1806 effettuate con reti ad imbrocco in medio Adriatico. Biol. Mar. Medit., 9(1): 154-160.

Grati, F., G. Fabi and G. Scarcella. – 2004. Retention and discarding for sole gillnet fishery in the Adriatic Sea. Rapp. Comm. Int. Mer Medit., 37: 369.

Hamley, J.M. and H.A. Regier. – 1973. Direct estimates of gillnet selectivity to walleye (Stizostedion vitreum vitreum). J. Fish. Res. Bd. Can., 30: 817-830.

Hovgård, H. and H. Lassen. – 2000. Manual on estimation of selectivity for gillnet and longline gears in abundance surveys. FAO Fish. Tech. Pap., 397.

Kitahara, T. – 1971. On selectivity curve of gillnet. Bull. Jap. Soc. Sci. Fish., 37: 289-296.

ISTAT (Istituto nazionale di STATistica). – 2002-2005. www.istat.it. Lagler, J.W. – 1968. Capture, sampling and examination of fishes. In: W.E. Ricker (ed.), Methods for Assessment of Fish production in Fresh Waters, pp. 7–45. Blackwell Scientific Publications, Oxford.

Lindman, H.R. – 1992. Analysis of variance in experimental design. Springer-Verlag, New York.

Madsen, N., R. Holst, D. Wileman and T. Moth-Poulsen. – 1999. Size selectivity of sole gill nets fished in the North Sea. Fish. Res., 44: 59-73. doi:10.1016/S0165-7836(99)00048-X

Millar, R.B. – 1992. Estimating the size-selectivity of fishing gear by conditioning on the total catch. J. Am. Stat. Ass., 87: 962-968. doi:10.2307/2290632

Millar, R.B. – 2000. Untangling the confusion surrounding the estimation of gillnet selectivity. Can. J. Fish. Aquat. Sci., 57: 507-511. doi:10.1139/cjfas-57-2-507

Millar, R.B. and R. Holst. – 1997. Estimation of gillnet and hook selectivity using log-linear models. ICES J. Mar. Sci., 54: 471-477. doi:10.1006/jmsc.1996.0196

Pagotto, G. and C. Piccinetti. – 1988. Censimento della popolazione di Solea vulgaris Quensel 1814 in Adriatico mediante marcatura. Atti I Sem. Italiano sui Censimenti faunistici, 354-359.

Reis, E.G. and M.G. Pawson. – 1992. Determination of gillnet selectivity for bass (Dicentrarchus labrax L.) using commercial catch data. Fish. Res., 13: 173-187. doi:10.1016/0165-7836(92)90025-O

Rudstram, L.G., C.S. Clay and J.J. Magnuson. – 1987. Density and size estimates of cisco (Coregonus artedii) using analysis of echo peak PDF from single-transducer sonar. Can. J. Fish. Aquat. Sci., 44: 811-821. doi:10.1139/f87-099

Sacchi, J., J.P. Dugauquier and S. Mortreux. – 1987. Selectivité des tremails à sole. IFREMER DIT/TNP/TP-Boulogne/mer. Convention Région Nord Pas de Calais.

Sbrana, M., P. Belcari, S. De Ranieri, P. Sartor and C. Viva. – 2007. Comparison of the catches of European hake (Merluccius merluccius, L. 1758) taken with experimental gillnets of different mesh sizes in the northern Tyrrhenian Sea (western Mediterranean). Sci. Mar., 71(1): 47-56.

Sechin, Y.T. – 1969. A mathematical model for the selection curve of a gillnet. Rybn. Khoz., 45: 56-58.

Siegel, S. – 1956. Nonparametric statistics: for behavioural sciences. Mc Graw Hill Book Company Inc., New York.

Winters, G.H. and J.P. Wheeler. – 1990. Direct and indirect estimation of gillnet selection curves of Atlantic herring (Clupea harengus harengus). Can. J. Fish. Aquat. Sci., 47: 460-470.

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Published

2008-06-30

How to Cite

1.
Fabi G, Grati F. Selectivity of gill nets for Solea solea (Osteichthyes: Soleidae) in the Adriatic Sea. Sci. mar. [Internet]. 2008Jun.30 [cited 2024Mar.28];72(2):253-6. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/822

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