Revisión de las pautas biológicas de la gamba roja Aristeus antennatus a lo largo del Mediterráneo: comparación con un caso de estudio de la población de gamba de la bahía de Antalya en el Mediterráneo Oriental

During three surveys between September 2009 and June 2011, a total of 20867 specimens of A. antennatus were caught from the 127 successful hauls with a total towing time of 219.5 h. Carapace length ranged between 12-61 mm for females (mean length, 35.8±8.2 mm) and 14-35 mm for males (24.8±3.4 mm). The two-way MANOVA shoved that depth had a significant effect on the abundance (p 27 mm) were recorded in June, July and August. The monthly gonadosomatic index of A. antennatus females changed seasonally, reaching a maximum value between July and August. The length-weight relationships in female and male specimens exhibited a strong negative allometry. The monthly length-frequency distributions showed that females of A. antennatus exhibited a maximum of six modal size groups per year. The recruitment of young-of-the-year took place mainly between January-April. The fishing mortality, reference point (F0.1) of fisheries mortality and exploitation rate were 0.498 year-1, 0.444 year-1 and 0.524 year-1, respectively. The fishery activity and the biological aspects of A. antennatus in the Antalya Bay have a lot of common and non-common points with other areas of the Mediterranean Sea. The above-men-tioned differences could be attributed to the different oceanographic and environmental parameters in the present study area.Se realizaron tres campañas de muestreo entre septiembre de 2009 y Junio de 2011 en el golfo de Antalya. En ellas se capturaron un total de 20867 ejemplares de A. antennatus a partir de 127 lances efectivos realizados en un total de 219.5 h. La longitud del caparazón de las hembras se mantuvo en un rango de 12-61 mm (media 35.8±8.2 mm), mientras que en los machos fue de 14-35 mm (media, 24.8±3.4 mm). La significación estadística entre la profundidad y los índices de abundancia y biomasa se testaron mediante una ANOVA de doble vía (p 27 mm) se registraron entre junio y agosto; meses en los cuales también se observaron los máximos índices gonadosomáticos de estas hembras. En ambos sexos la relación talla-peso presentó una fuerte alometría negativa. La distribución de frecuencias de tallas mensuales señaló para las hembras seis modas por año. El reclutamiento anual se detectó entre enero y abril. La mortalidad por pesca y la tasa de explotación fueron de 0.498 año-1, 0.444 año-1 y 0.524 año-1, respectivamente para los tres períodos de muestreo. En el bahía de Antalya la actividad pesquera y los aspectos fundamentales de la biología de A. antennatus presentan una alta similitud con resultados obtenidos de otras poblaciones del Mediterráneo Central y Occidental. Las pocas diferencias que se destacan se atribuyen a las particulares condiciones oceanográficas y ambientales del área de estudio

Razmnožavanje kozice Penaeus (Melicertus) kerathurus u zaljevu Amvrakikos, zapadna Grčka

The reproduction of the karamote prawn, Penaeus (Melicertus) kerathurus (Forskål 1775), was studied for the native population in Amvrakikos Gulf (Ionian Sea; western Greece). Sampling was carried out on a monthly basis between June 1999 and May 2001. The results showed that the shrimp Penaeus (Melicertus) kerathurus reproduction period spans between late April and late September. The size-at-maturity was estimated at a size of 45.23 mm carapace length (or 156.2 mm in total length). The smallest mature female in the samples was found to have 30 mm CL or 113.95 mm TL. Maximum gonadosomatic index (GSI) was estimated to be 9.62% for female shrimps at stage IV gonad maturity stage. The population gonadosomatic index peaks in May with an average value of 6.895%. Potential fecundity was estimated to be 154600 of oocytes per g of gonad tissue at the stage IV (mature female). Monthly sex ratios (males/females) were found greater than 1 throughout the year with maximum values reaching 2.5. A new life cycle pattern is proposed for this particular population.Razmnožavanje kozice, Penaeus (Melicertus) kerathurus (Forskål, 1775), je istraživano na populacijama iz prirodne sredine na području zaljeva Amvrakikos (Jonsko more, zapadna Grčka). Uzorkovanje je obavljeno svakog mjeseca u razdoblju između lipnja 1999. godine i svibnja 2001. godine. Rezultati istraživanja pokazuju da se kozica mrijesti u razdoblju travanj-rujan. Veličina pri kojoj kozica dosiže spolnu zrelost iznosi 45.23 mm dužina karapaksa (156.2 mm ukupna dužina). Utvrđena je najmanja spolno zrela ženka u uzorku pri dužini 30 mm dužina karapaksa (113.95 mm ukupna dužina). Najveća izračunata vrijednost gonadosomatskog indeksa iznosi 9.62% za ženke pri stadiju IV zrelosti gonada. Gonadosomatski indeks za čitavu populaciju ima svoj maksimum u svibnju pri srednjoj vrijednosti od 6.895%. Izračunati potencijalni fekunditet iznosi 154600 oocita po gramu tkiva gonada pri stadiju IV (zrela ženka). Mjesečni omjer spolova (mužjak/ženka) ima vrijednosti veće od 1 tijekom cijele godine uz maksimalnu vrijednost 2.5. Iznesen je i predložak obrasca novog životnog ciklusa populacije na istraživanom području

Mejora de stocks en el sudeste del Mar Negro, mediante la liberación de rodaballos, Psetta maxima, criados en cautividad: análisis de la captura, migración, crecimiento y dieta

In this study, the capture, growth, migration and diet of hatchery-released turbots (Psetta maxima) were examined in the southeastern Black Sea region for six years (2009-2014). A total of 9933 turbots were marked with individual serial-numbered T-bar anchor tags and released at Trabzon, Turkey. The mean TL and weight of the released turbots were 12.91 cm (±1.25) and 35.41 g (±12.38) and the same measurements for the captured turbots were 31.17±0.86 cm and 878.08±69.47 g, respectively. A total of 2.7% (270 fishes) of the tagged individuals were captured during the study period and the age of the captured tagged fishes was between 0+ and 5+ years. Growth of the captured turbots was analytically examined. Movements of the tagged turbots were expressed as “resident” and “migratory”. Three prey groups showed the majority of forage organisms; teleost fishes, crustaceans and mollusks in the stomach of the captured turbots. The hatchery-released turbots might be used for stock enhancement due to their high growth rate and commercial value, and their relatively limited migration range.En este estudio se examinaron datos de captura, crecimiento, migración y dieta, de rodaballos (Psetta maxima) criados en cautividad y liberados en zonas del sudeste del Mar Negro, durante seis años (2009-2014). Se marcaron individualmente un total de 9933 rodaballos, utilizando marcas numeradas en serie (marcas de plástico tipo T) y se liberaron en Trabzon (Turquía). Las medias de longitud total (TL) y peso total de los rodaballos liberados fueron de 12.91 cm (±1.25) y 35.41 g (±12.38), y las mismas medidas para los rodaballos capturados fueron de 31.17±0.86 cm y 878.08±69.47 g, respectivamente. Un 2.7% (270 peces) de los individuos marcados fue capturado durante el periodo de estudio y la edad de estos individuos osciló entre 0+ y 5+ años de edad. El crecimiento de los rodaballos capturados se examinó analíticamente. Los movimientos de los rodaballos marcados fueron expresados como “residentes” y “migratorios”. La mayoría de los organismos presentes en los estómagos de los rodaballos capturados pertenecían a tres grupos de presas: peces teleósteos, crustáceos y moluscos. Los rodaballos criados en cautividad y liberados podrían ser usados en la mejora de stocks debido a su elevada tasa de crecimiento, valor comercial, y su relativamente limitado rango de migración

On the Atlantic blue crab (Callinectes sapidus Rathbun 1896) in southern European coastal waters: Time to turn a threat into a resource?

[EN] The blue crab Callinectes sapidus is native to the coastal waters of the western Atlantic Ocean, and along the US coasts the species supports an important fishery. The crab was introduced to Europe at the beginning of the 20th century. To date, the species is considered invasive and it has been extensively recorded in southern European waters (SEW), where it is starting to penetrate the shellfish market. Here, an integrated management strategy is proposed for the blue crab in SEW, including the Mediterranean and Black Sea and the eastern Atlantic coasts of the Iberian Peninsula. Taking as introductory examples two case studies represented by the red king crab Paralithodes camtschaticus and the green crab Carcinus maenas, a framework of key issues is reviewed, considering the double nature of the species as invaders and shellfish products. A SWOT analysis is eventually presented for C. sapidus, in order to perform a state-of-the-art synthesis of the proposed scenario, highlighting the potential opportunities as well as the weaknesses related with the limited knowledge of the ecological and economic impact of the species in invaded habitats. The review is concluded by an appraisal of the current trends in global and European crustacean fisheries. The ongoing expansion of C. sapidus might represent a useful management case study, where the need to control an invasive species and mitigate its ecological impact can be harmonized with the opportunity to value it as a fishery resource.Funding from FUR 2013-2014 and 2015-2016 to G. M. is acknowledged. The European Fisheries Fund (FEP) Puglia Region (Italy) supported L. C. (CIP 04/OPI/010). The Portuguese Science Foundation (FCT) supported F. R. (SFRH/BPD/46761/2008). F. R. and P. C. were also supported by the strategic MARE plan Marine and Environmental Sciences Centre (UID/MAR/04292/2013). Constructive comments from two anonymous reviewers on an earlier version of the paper are gratefully acknowledged. This paper is dedicated to Sofia Mancinelli, thy eternal summer shall not fade.Mancinelli, G.; Chainho, P.; Cilenti, L.; Falco, S.; Kapiris, K.; Katselis, G.; Ribeiro, F. (2017). On the Atlantic blue crab (Callinectes sapidus Rathbun 1896) in southern European coastal waters: Time to turn a threat into a resource?. Fisheries Research. 194:1-8. https://doi.org/10.1016/j.fishres.2017.05.002S1819

A bio-economic evaluation of the potential for establishing a commercial fishery on two newly developed stocks: the Ionian Red Shrimp Fishery

It has recently been shown that two deep-water red shrimp species (Aristeus antennatus and Aristaeomorpha foliacea) have the potential to support a viable fishery in the Greek Ionian Sea (eastern Mediterranean). In this article, we investigate (i) the evolution that this newly developed trawl shrimp fishery may undergo when subjected to different management measures, and (ii) the most suitable extraction rates considering the uncertainties about the resource. We further analyse the effects that potential future fuel price increases and changes in the market may have on the fishery. Forecasting the biological and economic consequences of management actions, as well as the effects of market changes on inputs and outputs before they are applied, may help managers select the most suitable management options. We approach the problem by means of bio-economic simulation analysis. The results of this study show that fishing effort can increase by 50-100%, increasing the fleet's profitability without jeopardizing the sustainability of the fishery

Dekapodni rakovi u zaljevu Argolikos (istočni dio Sredozemnog mora, središnji dio Egejskog mora)

The study presents the biomass, the abundance and the depth distribution of the decapod crustaceans in Argolikos Gulf (Central Aegean Sea) from data collected in trawl surveys carried out throughout 2008. This work is the first systematic work in this important Greek area and will support the knowledge for understanding the decapods stocks’ fishery in the above area. A total of 28 species of decapod crustaceans was identified from a total of 42 hauls made in three depth zones (50-100 m, 100-200 m, 500-600 m). Among decapods recorded were 6 Dendrobranchiata (5 Penaeoidea, 1 Sergestoidea), 22 Pleocyemata (9 Brachyura, 8 Caridea, 2 Anomura, 1 Palinurid, 1 Astacideum, 1 Stenopodidea). The most abundant commercial species found in both shallower depth zones (50-100 m, 100-200 m ) was Parapenaeus longirostris while in the deepest one (500-600 m) Aristaeomorpha foliacea was the most numerous. Some new depth distribution records for the Eastern Mediterranean were obtained for some few species.U ovom radu su prikazani biomasa, abundancija i dubinska raspodjela dekapodnih rakova u Argolikos zaljevu (središnji dio Egejskog mora) dobiveni iz podataka prikupljenih povlačnim alatima tijekom 2008. godine. Ovaj rad je prvi sustavni rad, iz ovog važnog grčkog područja, koji donosi saznanja za bolje razumijevanje dekapodnih zaliha. Ustanovljeno je 28 vrsta dekapodnih rakova tijekom 42 koćarska potega na tri dubine (50-100 m, 100-200 m, 500-600 m). Zabilježene su slijedeće vrste dekapodnih rakova: 6 Dendrobranchiata (5 Penaeoidea, 1 Sergestoidea), 22 Pleocyemata (9 Brachyura, 8 Caridea, 2 Anomura, 1 Palinurid, 1 stacideum, 1 Stenopodidea). Najbrojnija komercijalna vrsta koja je pronađena u obje pliće zone (50-100 m, 100-200 m) je P. longirostris, dok je u najdubljoj zoni (500-600 m) bio najbrojniji A. foliacea. Tijekom istraživanja u istočnom Sredozemnom moru su ustanovljeni novi nalazi o raspodjeli nekih vrsta prema dubini