Preservation of juvenile hake (&lt;i&gt;Merluccius merluccius&lt;/i&gt; L) in the western Mediterranean demersal trawl fishery by using sorting grids

Sardà, Francesc; Molı́, Balbina; Palomera, Isabel

doi:10.3989/scimar.2004.68n3435

Cited by 38 publications

(39 citation statements)

References 16 publications

(18 reference statements)

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“…Values are higher in the eastern Mediterranean (T: 13.8°C and S: 38.74 psu below 700 m) (Miller et al 1970). Still warmer temperatures of around 14°C (Politou et al 2004) have been recorded at depths greater than 2,500 m. The eastern Mediterranean is more oligotrophic than the western Mediterranean (Estrada 1996), but as a rule the large basins can be regarded as having sufficient oxygen, with values of between 4 and 5 ml/l of oxygen at depths greater than 3,000 m. General oceanographic conditions in the Mediterranean have been described in Miller et al (1970), Hopkins (1985), Bas (2002) and Sardà et al (2004a).…”

Section: Introductionmentioning

confidence: 89%

Biological patterns and ecological indicators for Mediterranean fish and crustaceans below 1,000 m: a review

Sardà

Rotllant

Coll

2009

Rev Fish Biol Fisheries

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The Mediterranean Sea is a relatively deep, closed sea with high rates of fisheries exploitation. In recent years fishing activity has tended to shift towards deeper depths. At the same time, the Mediterranean displays some rather special hydrographic and biogeographic conditions. The present paper reviews the present state of knowledge of the fisheries, biology, and ecology of the deep-sea fish and crustacean species in the Mediterranean dwelling below 1,000 m with potential economic interest, placing special emphasis on the western basin, for which more data are available, as a basis for future studies of the ecology, biodiversity, and effects of climate change and exploitation in this zone. This review reveals that mediterranean deep-sea fishes and crustaceans employ highly conservative ecological strategies, and hence the low fecundity and low metabolic rates in a stable environment like the deepsea make these populations highly vulnerable.Moreover, ripe females of the main species mentioned here concentrate in the deepest portions of their distribution ranges. Deep-sea fish and crustaceans have high trophic levels and low to medium omnivory index values. The ecological indices discussed here, in combination with the limited knowledge of deep-sea ecosystems, clearly call for an approach based on the Precautionary Principle.

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Section: Introductionmentioning

confidence: 89%

Biological patterns and ecological indicators for Mediterranean fish and crustaceans below 1,000 m: a review

Sardà

Rotllant

Coll

2009

Rev Fish Biol Fisheries

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“…In addition, square mesh value Table 10, no studies were sufficient enough release the under MLS individuals. Therefore, other selectivity devices such as grids should be tested for improved hake selectivity suggested by Sarda et al (2004). This is the first study reporting the trawl selection for Morocco dentex from Mediterranean basin.…”

Section: Discussionmentioning

confidence: 99%

Untitled

Dereli̇¹,

Aydın²

2016

Turk. J. Fish. Aquat. Sci.

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This paper compares the selectivity of 44 mm diamond mesh codend used in commercial fisheries (D44) and alternative codends 50 mm diamond (D50), a 40 mm square (S40) and a 40 mm 90° turned mesh (T40) for red mullet Mullus barbatus, European hake Merluccius merluccius, Morocco dentex Dentex maroccanus, Atlantic horse mackerel Trachurus trachurus in the Eastern Mediterranean demersal trawl fishery. Sea trials were carried out in the international waters between Turkey and Greece (Aegean Sea), with commercial trawler. Selectivity data were collected using the covered codend method and analysed by means of a logistic equation with the maximum likelihood method. Mean selection curves were estimated and compared using the between-haul variations model. The mean 50% retention total length values (L50) of D44, D50, S40 and T40 codends are 11.1, 12.9, 12.9 and 13.6 cm for red mullet, 12.3, 14.4 and 14.3 cm for hake, 10.0, 10.7, 10.3 and 8.4 cm for Morocco dentex and 16.2, 14.2, 15.3 and 17.1 cm for mackerel, respectively. The results show that there are statistically differences between L50 values of four codends for only red mullet. S40 and T40 codends improve the selectivity of red mullet when considering commercially D44 codend.Keywords: Codend selectivity, mesh shape, Eastern Mediterranean, demersal trawl. Doğu Akdeniz Dip Trol Balıkçılığında Dört Tür İçin Ticari ve Alternatif Torbaların Seçiciliği ÖzetBu çalışmada Doğu Akdeniz demersal trol balıkçılığında ticari olarak kullanılan 44 mm baklava gözlü torba (D44) ile 50 mm baklava gözlü (50D), 40 mm kare gözlü (S40) ve 40 mm 90° döndürülmüş (T40) alternatif torbaların barbunya Mullus barbatus, bakalyaro Merluccius merluccius, Fas mercanı Dentex maroccanus ve istavrit Trachurus trachurus için seçicilikleri karşılaştırılmıştır. Denemeler ticari trol teknesi ile Türkiye ile Yunanistan arasında kalan uluslararası sularda (Ege Denizi) yürütülmüştür. Seçicilik verisi çemberli örtü torba tekniği ile toplanmış ve lojistik eşitliğin maksimum olabilirlik yöntemi ile analiz edilmiştir. Ortalama seçicilik eğrileri, çekimler arası varyasyon modeli kullanılarak tahmin edilmiş ve karşılaştırılmıştır. D44, D50, S40 ve T40 torbalarındaki ortalama % 50 yakalama boyları (L50) barbunya için sırasıyla 11,1; 12,9; 12,9 ve 13,6 cm, bakalyaro için 12,3; 14,4 ve 14,3 cm, Fas mercanı için 10,0; 10,7; 10,3 ve 8,4 cm ve istavrit için 16,2; 14,2; 15,3 ve 17,1 cm olarak tespit edilmiştir. Bulgular, dört torbanın L50 değerleri arasında istatistiksel farkın sadece barbunya için bulunduğunu göstermektedir. S40 ve T40 torbalar, ticari olarak kullanılan D44 torbaya göre barbunyanın seçiciliğini geliştirmiştir.Anahtar Kelimeler: Torba seçiciliği, göz şekli, Doğu Akdeniz, demersal trol.

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“…Therefore, a reduction in fishing mortality of immature fish could be a fundamental prerequisite for sustainable fisheries. The implementation of the following requirements-use of a large mesh size, squaremesh panels, and selection grids in trawl fisheries-has reduced the bycatch of juvenile European hake (Sardà et al, 2004;Lucchetti, 2008). However, these measures may not be sufficiently effective in protecting juveniles and nursery areas.…”

Section: Meanmentioning

confidence: 99%

Modeling the growth of recruits of European hake (Merluccius merluccius) in the northwestern Mediterranean Sea with generalized additive models

Ligas¹,

Colloca²,

Lundy³

et al. 2014

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Preservation of juvenile hake (<i>Merluccius merluccius</i> L) in the western Mediterranean demersal trawl fishery by using sorting grids

Cited by 38 publications

References 16 publications

Biological patterns and ecological indicators for Mediterranean fish and crustaceans below 1,000 m: a review

Biological patterns and ecological indicators for Mediterranean fish and crustaceans below 1,000 m: a review

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Modeling the growth of recruits of European hake (Merluccius merluccius) in the northwestern Mediterranean Sea with generalized additive models

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