The general specifications of the MEDITS surveys

Bertrand, Jacques; Sola, Luís Gil de; Papaconstantinou, Costas; Rélini, Giulio; Souplet, Arnauld

doi:10.3989/scimar.2002.66s29

Cited by 398 publications

(396 citation statements)

References 4 publications

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“…Due to the gear design and sampling strategy, it is possible to conclude that the inter-annual variability in starry ray catches will likely reflect variations in abundance (Bertrand et al, 2002). Our results show welldefined persistence areas for this species which shows wider distribution patterns in respect to what observed from the MEDITS survey (Piccinetti et al, 2012).…”

Section: Discussionsupporting

confidence: 62%

Raja asterias population assessment in FAO GFCM GSA17 area

et al. 2016

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Population structure and distribution of the starry ray, Raja asterias, were described based on data collected during yearly rapido trawl surveys (SoleMon), between 2005 and 2014 in the Northern and Central Adriatic Sea. A total of 306 individuals were caught, sex ratio was 1.04:1 in favor of males and length-weight relationships were obtained for the whole sample. Following the MEDITS scale, maturity was estimated, observing a higher number of immature individuals. Relative abundance significantly increased during the recent period with the highest values recorded at 5-30 m depths. Such increase could be related to the response of R. asterias to climatic change or to the decrease in fishing pressure in the area. Clear spatial segregation of individuals depending on their life stage was observed, with immature individuals inhabiting the coastal areas and adults more abundant at depths greater than 40 m. The comparison of the result of the present study with MEDITS survey outcomes in terms of distribution patterns, persistence areas of adults and juveniles and abundances indices, evidences that SoleMon survey seems to be more suitable in defining such features of the stock, likely due to the greater catchability of the rapido trawl in respect to the MEDITS trawl net. However, further investigations are needed to identify factors affecting the increasing abundance of this species, and develop an action plan for spatial management of fishing activities.

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Section: Discussionsupporting

confidence: 62%

Raja asterias population assessment in FAO GFCM GSA17 area

et al. 2016

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“…The sampling gear used was a GOC73 trawl net, which has been used since 1994 for different surveys undertaken throughout the western Mediterranean and its efficiency for catching demersal species has already been tested (Bertrand et al, 2002). The average towing speed was 2.8 knots.…”

Section: Data Sourcementioning

confidence: 99%

Demersal resource assemblages in the trawl fishing grounds off the Balearic Islands (western Mediterranean)

Massutí¹,

Reñones²

2005

Sci. Mar.

125

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SUMMARY:The demersal resources distributed in the trawl fishing grounds off the Balearic Islands (western Mediterranean) were studied from two bottom trawl surveys carried out in spring and autumn along the continental shelf and upper slope off the islands of Mallorca and Menorca. A total of 88 hauls, between 41 and 745 m depth, were analysed by means of multivariate analysis and ecological parameter calculation in order to characterise the structure of commercial species assemblages. A different bathymetric distribution of abundance was observed by comparing the main taxonomic groups. Six main species assemblages were identified, primarily associated with depth but also with different macro-epibenthic communities. Seasonal or geographic differences were detected for three of these assemblages, which could be related to differences in habitats and macro-epibenthic communities, as well as to seasonal changes in the abundance of some species related to their life cycle.

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“…The new specimen of Protogrammus alboranensis was collected from a bottom trawl sampling carried out at 159 m depth during the MEDITS_ES05_17 survey that took place around the Balearic Islands in June 2017 (for more specifications on sampling and design see Bertrand et al 2002) (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

First record of the Alboran dragonet, Protogrammus alboranensis (Actinopterygii: Callionymiformes: Callionymidae), from the Balearic Islands (western Mediterranean)

Fricke¹,

Ordines²

2017

Acta Ichthyol. Piscat.

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Results. Protogrammus alboranensis is recorded from the Balearic Islands for the first time; the specimen is examined, described and illustrated. Conclusions.The new record confirms that the species is more widely distributed in the western Mediterranean than previously expected. This type of study is needed to know about the distribution and habitats of this rare species, to support possible conservation measures. The depth of collection and the benthic habitat in the sampling location were similar to those in the location of the original description of the species (Alboran Island): deep shelf bottoms with biogenic coarse sand and presence of abundant dead shells in both locations. The colouration of the species is highly mimetic with that type of sediments indicating that this is probably the ideal habitat for the species.

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The general specifications of the MEDITS surveys

Cited by 398 publications

References 4 publications

Raja asterias population assessment in FAO GFCM GSA17 area

Raja asterias population assessment in FAO GFCM GSA17 area

Demersal resource assemblages in the trawl fishing grounds off the Balearic Islands (western Mediterranean)

First record of the Alboran dragonet, Protogrammus alboranensis (Actinopterygii: Callionymiformes: Callionymidae), from the Balearic Islands (western Mediterranean)

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