Acoustic estimation of abundance and distribution of sardine in the northwestern Mediterranean.

Abad, R.; Miquel, Joan; Iglesias, M.; Álvarez, Federico

doi:10.1016/s0165-7836(97)00101-x

Cited by 25 publications

(20 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result most of the larvae located in that area must have been transported there by the current. These findings agree with the abundance of adults in the Gulf of Lions and the scarcity of adults off Barcelona reported by Pertierra and Lleonart (1996) and Abad et al (1998). This would also account for the high concentrations of juveniles recorded by these last authors off Barcelona.…”

Section: Discussionsupporting

confidence: 92%

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Sabatés¹,

Salat²,

Olivar³

2001

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: The presence of a surface layer of a less saline water of continental influence (CIW) along the continental slope off the Catalan coast (NW Mediterranean) was observed in June 1995. This CIW was formed in the Gulf of Lions from Rhône runoff and carried by the current associated with the shelf-slope front. This study analyses the spatio-temporal behaviour of that water of continental influence in relation to the shelf-slope front, and its effect on the distribution of fish larvae, in particular the larvae of the anchovy, Engraulis encrasicolus. Displacements of the front are observed to follow an oscillation with a period of eight days and an amplitude of 10 km. Anchovy larvae were associated with the presence of CIW, whereas the oceanic species Hygophum benoiti appeared in the region of the slope when the front, and the associated CIW layer, moved close inshore during its oscillation. The size frequency distribution for the anchovy larvae trapped within the CIW suggests that the larvae had been spawned further north, near the Gulf of Lions. It is concluded not only that larvae were transported by the current but also that their development had taken place entirely inside the CIW. The possible benefit to the survival of anchovy larvae of being kept inside that water, though they have been carried far from their spawning areas, is discussed in the basis of fluorescence and microzooplankton data.

show abstract

Section: Discussionsupporting

confidence: 92%

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Sabatés¹,

Salat²,

Olivar³

2001

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…The elementary sampling distance unit was 1 nautical mile (Abad et al, 1998). For the identification of target species, pelagic trawls (9 and 10 trawls during ECOMED 2000 and 2001 respectively) were carried out with a net that had 20 m of vertical aperture equipped with a SIMRAD FR-500 net-sonder.…”

Section: Recruitment Estimationmentioning

confidence: 99%

Contribution of larval growth rate vairability to the recruitment of the Bay of Málaga anchovy (SW Mediterranean) during 2000-2001 spawning seasons

et al. 2003

View full text Add to dashboard Cite

, se produjo un importante aumento del reclutamiento de anchoa estimado por el método acústico en 13,000 TM en la Bahía de Málaga. La distribución de tallas de los reclutas de anchoa presentó un aumento de 2 cm aproximadamente entre los años 2000 y 2001. La estacionalidad de la puesta se corresponde con las estimaciones del modelo de crecimiento para cada año. Los datos del medio-ambiente para los 2 años muestreados son aportados por un proyecto de seguimiento trimestral de las condiciones oceanográficas. La biomasa zooplanctónica aumentó de forma significativa, en costa como en mar abierto, durante Julio del 2001. Sin embargo, no se observaron cambios significativos en la temperatura superficial entre años. En el 2001, se observa un adelanto a primavera de la puesta de la anchoa. Este estudio evidencia a partir de datos de campo la relación entre variabilidad del crecimiento larvario y reclutamiento.Palabras clave: anchoa, larvas, Mediterráneo, crecimiento, zonas de alevinaje, medio-ambiente, reclutamiento.

show abstract

“…This methodology was first applied in the CALCOFI area (Methot, 1983), and later in the SE Atlantic (Painting et al, 1998;Van der Lingen, 2002), SW Atlantic (Anonymous, 1989) and NE Atlantic (López-Jamar et al, 1995), in the latter case to analyse the recruitment process of European sardine (Sardina pilchardus Walbaum 1792). The present study was undertaken within the framework of a research project one of whose main objectives was to define the Optimal Environmental Windows (OEWs) (Cury and Roy, 1989;Guisande et al, 2001) for Alborán Sea European sardine populations, which have showed major fluctuations in the last few decades (Abad et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Along the narrow northern shelf of the Alborán Sea, several bays constitute important nursery grounds for small pelagic fishes, among which the Málaga bay is the most important (García et al, 1988). Sardine is the most abundant small pelagic fish species in the Alborán Sea (Abad et al, 1998) and, like anchovy, is one of the traditional target species of the Mediterranean Spanish purse seine fleet (Alemany and Álvarez, 1993).…”

Section: Introductionmentioning

confidence: 99%

Postflexion larvae and juvenile daily growth patterns of the Alborán Sea sardine (<em>Sardina pilchardus</em> Walb.): influence of wind

Alemany¹,

Álvarez²,

García³

et al. 2006

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY:The Alborán Sea is a hydrographically complex and variable area in which wind-driven coastal upwelling occurs. Its most abundant small pelagic resource is the sardine (Sardina pilchardus), which is subject to major interannual oscillations. Postflexion stages of sardine larvae were sampled in their main nursery grounds in the north Alborán Sea, and sardine juveniles were sampled periodically throughout the recruitment season. Daily growth analysis was used to identify periods favourable for larval survival and to assess the evolution of daily increment widths during the first months of life. The results showed that juveniles born later in the spawning season grew relatively faster than those born earlier. Two main growth phases were observed in juveniles: an initial one in which daily increment widths increased progressively, and a second one in which widths fluctuated, showing a decreasing trend. The beginning of the second phase was almost synchronous among different sub-cohorts, suggesting that it was triggered by environmental factors. The estimated mean daily growth rates during the larval phase were higher in surviving juveniles than in postflexion larvae born in the same month, supporting the "bigger is better" hypothesis in relation to larval survival. The influence of the environmental regime on growth was explored, and the evolution of a growth-related index, derived from otolith increment width variability, was compared with a single environmental descriptor, a "wind index" based on wind stress and direction. This analysis suggested that larval survival and larval and juvenile growth rates showed a positive correlation with NW component winds, associated with upwelling events on the continental shelf and calm sea weather conditions in the inshore nursery grounds. Conversely, Levantine and southern wind periods, which interrupt the upwelling and create rough seas in the inshore bays, lead to a decrease in growth rates in juveniles and low larval survival.Keywords: Sardina pilchardus, daily growth, wind stress, recruitment, Alborán Sea. RESUMEN: CRECIMIENTO DIARIO EN LARVAS EN POSTFLEXION Y JUEVENILES DE SARDINA (SARDINA PILCHARDUS WALB.) DEL MARDE ALBORÁN: INFLUENCIA DEL VIENTO. -El mar de Alborán es una zona hidrográficamente compleja y variable, en la que se producen fenómenos de afloramiento costero inducidos por vientos. Su recurso más abundante entre los pequeños pelágicos es la sardina (Sardina pilchardus), que está sujeto a importantes fluctuaciones interanuales. Se muestrearon estadios larvarios avanzados (larvas en estadio de postflexión del urostilo), en sus principales áreas de reclutamiento del norte del mar de Alborán. Los juveniles de sardina fueron muestreados periódicamente a lo largo de la temporada de reclutamiento. Estudios de crecimiento diario permitieron identificar periodos de alta supervivencia larvaria, así como analizar la evolución de la anchura de los microincrementos durante los primeros meses de vida, revelando que los juveniles nacidos más tarde en la época de pue...

show abstract

Acoustic estimation of abundance and distribution of sardine in the northwestern Mediterranean.

Cited by 25 publications

References 9 publications

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Contribution of larval growth rate vairability to the recruitment of the Bay of Málaga anchovy (SW Mediterranean) during 2000-2001 spawning seasons

Postflexion larvae and juvenile daily growth patterns of the Alborán Sea sardine (<em>Sardina pilchardus</em> Walb.): influence of wind

Contact Info

Product

Resources

About

Acoustic estimation of abundance and distribution of sardine in the northwestern Mediterranean.

Cited by 25 publications

References 9 publications

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Advection of continental water as an export mechanism for anchovy, Engraulis encrasicolus, larvae

Contribution of larval growth rate vairability to the recruitment of the Bay of Málaga anchovy (SW Mediterranean) during 2000-2001 spawning seasons

Postflexion larvae and juvenile daily growth patterns of the Albor&aacute;n Sea sardine (<em>Sardina pilchardus</em> Walb.): influence of wind

Contact Info

Product

Resources

About

Postflexion larvae and juvenile daily growth patterns of the Alborán Sea sardine (<em>Sardina pilchardus</em> Walb.): influence of wind