Size at Maturity and Ovigerous Period of the Pink Shrimp Parapenaeus Longirostris (Lucas, 1846) in Tunisia

Gharbi, Houcine; Meriem, Sadok Ben; Fehri-Bedoui, Rafika

doi:10.1163/156854001505424

Cited by 13 publications

(6 citation statements)

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“…The values of length at first maturity estimated in our study are higher than those previously reported both in the Mediterranean (Levi et al, 1995;Mori et al, 2000;Ben Meriem et al, 2001) and Atlantic (Ribeiro-Cascalho and Arrobas, 1987;García, 1994, 2007), and are similar to those reported by Spedicato et al (1996), in the central Mediterranean. However, comparisons of the first maturity size must be viewed with caution, as these values may be greatly influenced by sample size and composition (Mori et al, 2000), especially if there is an absence of smaller lengths in the samples (Ben Meriem et al, 2001). The differences between locations observed in our study cannot be attributed to any of these factors, because both areas show similar length frequency distributions, even with smaller specimens in CA than in SO.…”

Section: Discussionsupporting

confidence: 86%

“…The absence of a seasonal pattern in the abundance of juveniles reflects the continuous spawning found for this species in our study. Although high abundance of juveniles has been found for a certain season in some studies (for instance, during autumn in the central Mediterranean, Lembo et al, 1999), continuous spawning is common both in the Mediterranean (Nouar, 1985;Tom et al, 1988;Spedicato et al, 1996;Mori et al, 2000;Ben Meriem et al, 2001;Bayhan et al, 2005) and the Atlantic (Dos Santos, 1998;Ribeiro-Cascalho and Arrobas, 1987;Sobrino and García, 1994), with peaks of reproductive activity varying between areas without a clear trend. Our peaks of maximum spawning are reflected differentially in the biological indexes.…”

Section: Discussionmentioning

confidence: 99%

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Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca Parapenaeus longirostris (Crustacea: Decapoda) en el Mediterráneo occidental

Guijarro¹,

Massutí²,

Moranta³

et al. 2009

Sci. Mar.

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SUMMARY: The deep-water rose shrimp Parapenaeus longirostris is a demersal decapod crustacean that is commercially exploited by trawl fleets. The present work compares its population dynamics, biology and condition in two locations (southern and north-western Mallorca in the Balearic Islands, western Mediterranean, separated by a distance of 120 km) with different environmental conditions and explores the relationships between the species and certain environmental factors. Six multidisciplinary bimonthly surveys were carried out during 2003 and 2004 in these two locations (between 150 and 750 m depth) in order to collect data on the demersal species with bottom trawl, the hydrography (temperature and salinity) with CTD casts, and trophic resources (zooplankton in the water column and suprabenthos with Bongo net and Macer-GIROQ sledge respectively) and sediments with a Shipeck dredge. The trawl fleets from both locations were monitored by monthly on board sampling and daily landings obtained from sales bills. Additional data was obtained from other trawl surveys. Temporal differences were detected both annually, with a decreasing trend over the last years in species abundance, and seasonally, in the biological indexes analysed. Bathymetric differences were also found in abundance, mean length, sex-ratio and condition of females. There were clear differences between the two locations studied, with higher abundance, condition and mean length and a lower length at first maturity for females in the north-western location. Trophic conditions could act as a link between geo-physical and biological changes. These short spatio-temporal differences could be due to the higher productivity found at this location, with higher density of preferred prey for the studied species together with adequate seafloor topography, sediment composition and hydrographical characteristics.Keywords: Parapenaeus longirostris, reproduction, fishery, spatio-temporal variations, hydrography, bottom characteristics, prey availability. RESUMEN:Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca ParaPenaeus longirostris (Crustacea: Decapoda) en el Mediterráneo occidental. -La gamba blanca Parapenaeus longirostris es un crustáceo decápodo demersal explotado comercialmente por la flota de arrastre. Este trabajo tiene como objetivo comparar su dinámica poblacional, biología y condición en dos localidades (situadas al sur y al noroeste de Mallorca en las Islas Baleares, Mediterráneo occidental, separadas por 120 km de distancia) con diferentes condiciones ambientales y explorar las relaciones entre la especie y algunos factores ambientales. Se realizaron seis campañas multidisciplinares bimensuales durante 2003 y 2004 en estas dos localidades (entre 150 y 750 m de profundidad) para obtener datos de las especies demersales con arrastre de fondo, de la hidrografía (temperatura y salinidad) con registros de CTD, de los recursos tróficos (zooplancton de la columna de agua y suprabentos, con una red Bongo...

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca Parapenaeus longirostris (Crustacea: Decapoda) en el Mediterráneo occidental

Guijarro¹,

Massutí²,

Moranta³

et al. 2009

Sci. Mar.

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“…However, neither of these modifications is sufficient for achieving sustainable exploitation of this shrimp stock. There is no Mls defined for this species in the Turkish Fisheries Regulations (anonymous, 2008); however, its length at first maturity is known to be 20 mm (Meriem et al, 2001), and in the eU countries around the Mediterranean sea this species has an Mls of 20 mm Cl (eC Reg. 1967Reg.…”

Section: Discussionmentioning

confidence: 99%

Selectivity of commercial, larger mesh and square mesh trawl codends for deep water rose shrimp Parapenaeus longirostris (Lucas, 1846) in the Aegean Sea

2009

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sUMMaRy: We investigated the differences between size selectivity of a commercial codend (40 mm diamond mesh -40d), a larger mesh codend (48 mm diamond mesh -48d), and a square mesh codend (40 mm square mesh -40s) for Parapenaeus longirostris in international waters of the aegean sea. selectivity data were collected by using a covered codend method and analysed taking between-haul variation into account. The results indicate significant increases in l 50 values in relation to an increase in mesh size and when the square mesh is used in the commercial trawl codend. The results demonstrate that the commercially used codend (40d) is not selective enough for P. longirostris in terms of length at first maturity. Changing from a 40d to a 48d codend significantly improves selection, with an increase of about 15% in the l 50 values (carapace length 14.5 mm for 40d and 16.6 mm for 48d). similarly, 40 mm square mesh, which has recently been legislated for eU Mediterranean waters, showed a 12.4% higher mean l 50 value (16.3 mm) than 40 mm diamond mesh for this species. However, despite these improvements, the 48d and 40s codends still need further improvements to obtain higher selectivity closer to the length at first maturity (20 mm carapace length).Keywords: Parapenaeus longirostris, mesh size, mesh shape, diamond mesh, square mesh.ResUMen: Selectividad para malla más grande y malla cuadrada de los copos comerciales en la pesca de la gamba blanca ParaPenaeus longirostris (Lucas, 1846) en el mar Egeo. -se estudian las diferencias entre la selectividad de los copos comerciales (40 mm de malla de diamante -40d); copos de malla más grande (48 mm de malla de diamante -48d), y copos de malla cuadrada (40 mm -40s), en la pesquería de Parapenaeus longirostris en aguas internacionales del mar egeo. Para su estudio se utilizó el método del sobrecopo, y para su análisis, se tuvo en cuenta la variación intra-lances. los resultados indican un incremento de los valores de l 50 cuando se incrementa el tamaño de malla, y también con el uso de la malla cuadrada. los resultados demuestran que el copo comercial actual (40d), no es suficientemente selectivo para P. longirostris en relación a la talla de primera madurez. el cambio, la malla de 48d, produce una mejora significativa en la selectividad cercana al 15% de incremento en los valores de la l 50 (longitud del caparazón de 14.5 mm para 40d y 16.6 mm para 48d). igualmente, la malla 40s, la cual ha sido legislada recientemente por la Ue en aguas del Mediterráneo, muestra un incremento de la selectividad aproximadamente de un 12% en los valores de la l 50 (16.3 mm) respecto a la de 40d. no obstante, a pesar de estas mejoras, los copos de 48d y 40s, todavía deberían ser ampliados para obtener selectividades más elevadas y acercarse a la talla de primera madurez (20 mm de caparazón).Palabras clave: Parapenaeus longirostris, tamaño de malla, forma del malla, rombo, malla cuadrada. , 597-604, barcelona (spain) issn: 0214-8358 Scientia Marina73(3) september 2009

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“…DPS is a short-lived species characterized by high growth and mortality rates 56 , which reproduces throughout the year 57,58 . Individuals are mainly found in sandy and muddy bottoms between 100 and 300 m, although the species has a bathymetric distribution range of 20–750 m 58 .…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic controls on connectivity of the high commercial value shrimp Parapenaeus longirostris (Lucas, 1846) in the Mediterranean Sea

Quattrocchi

Sinerchia

Colloca

et al. 2019

Sci Rep

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In the Strait of Sicily (SoS), a wide passage of the Mediterranean Sea, Parapenaeus longirostris, (Lucas, 1846; DPS hereafter) is the main target species of trawl fisheries, with an estimated annual market value of about 80 million euro. The exploitation of this resource is shared between Italian, Tunisian and Maltese bottom trawlers and its management raises social, economic and environmental interests. Recent stock assessment revealed high fishing mortalities and low size at first capture, thus promoting the adoption of a strategic plan for a sustainable management. However, the current knowledge of the geographical boundaries of the stock, supporting the implementation of such management plan is still poor. In this respect, under different hydrodynamic regimes, particle-tracking modelling was used to explore connectivity between both, known and unexplored, spawning and nursery areas of DPS in the SoS. Ensembles scenarios derived by model outcomes displayed decadal changes in connectivity between spawning and nursery areas in the north side of the SoS, hence confirming the presence of a single stock in this area. Expanding the area of investigation, the model results showed weak connectivity between spawning ground in the north side of SoS and nurseries on the African shelf-break. This method could support the spatial management of the stock, such as the protection of the nursery and spawning areas, by providing estimates of how connectivity is influenced by hydrodynamic regimes at different temporal and spatial scales.

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Size at Maturity and Ovigerous Period of the Pink Shrimp Parapenaeus Longirostris (Lucas, 1846) in Tunisia

Cited by 13 publications

References 0 publications

Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca <i>Parapenaeus longirostris</i> (Crustacea: Decapoda) en el Mediterráneo occidental

Variaciones espacio-temporales a pequeña escala en la dinámica poblacional y biología de la gamba blanca <i>Parapenaeus longirostris</i> (Crustacea: Decapoda) en el Mediterráneo occidental

Selectivity of commercial, larger mesh and square mesh trawl codends for deep water rose shrimp <em>Parapenaeus longirostris</em> (Lucas, 1846) in the Aegean Sea

Hydrodynamic controls on connectivity of the high commercial value shrimp Parapenaeus longirostris (Lucas, 1846) in the Mediterranean Sea

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