Oceanographic habitat, growth and mortality of larval anchovy (Engraulis encrasicolus) in the northern Aegean Sea (eastern Mediterranean)

Somarakis, Stylianos; Nikolioudakis, Nikolaos

doi:10.1007/s00227-007-0761-6

Cited by 79 publications

(104 citation statements)

References 49 publications

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“…In the North Aegean Sea, the extension of anchovy larval grounds is clearly related to the horizontal distribution of BSW (Isari et al, 2008). Moreover, higher egg and larval production has been reported in years with lower salinities (Somarakis and Nikolioudakis, 2007;Somarakis et al, in press). The inter-annual difference in salinity observed in this study could therefore explain (at least in part) the low abundance of anchovy in the east during June 1999.…”

Section: Discussionmentioning

confidence: 98%

Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity

Somarakis¹,

Isari²,

Machias³

2011

Sci. Mar.

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SUMMARY: Patterns in the mesoscale distribution of larval fish in the coastal waters of central Greece, an area of high topographic and bathymetric complexity, were analysed using samples collected during two ichthyoplankton surveys in July 1998 and June 1999. Salinities were lower in the eastern (Aegean) part of the study area due to the influence of waters originating from the Black Sea. In this region, larvae of many epipelagic and benthopelagic (typically summer spawning) species were less abundant in June 1999, when waters were significantly cooler, compared to July 1998. Multivariate analyses identified 'neritic' and 'pelagic' groups of stations dominated by larvae of epipelagic/bethopelagic (typically shelf dwelling) and mesopelagic species. In the west (Ionian Sea), a prominent third group of stations located in the deep and highly enclosed Korinthiakos Gulf was also defined with very high abundances of mesopelagic fish larvae. However, the genera Cyclothone and Vinciguerria that dominated the neighbouring offshore assemblage of the Ionian Sea were absent from this gulf. In the study area, Korinthiakós Gulf (>900 m) and North Evoikos (>400 m) Gulf comprise unique 'fjord-like' ecosystems in the Mediterranean with increased productivity and significantly cooler deep waters compared to adjacent open sea basins.

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Section: Discussionmentioning

confidence: 98%

Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity

Somarakis¹,

Isari²,

Machias³

2011

Sci. Mar.

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“…Larval sprat growth rates between 0.30 and 0.36 mm d -1 were reported at 15°C in the North Sea (Alshuth, 1988) and rates of 0.40 to 0.42 mm d -1 were reported in January in the Adriatic Sea at surface water temperatures between 10 and 11.5°C (Dulčic´, 1998). Anchovy can reach higher growth rates in the same size class (6-20 mm), ranging from 0.5 mm d -1 at 16-18°C (Garcia et al, 1998;Somarakis and Nikolioudakis, 2007) to 0.9 mm d -1 at 20°C (Palomera et al, 1988). These examples for sprat and anchovy also suggest that the larvae of the latter species might cope better with the relatively high temperatures (17.0-20.5°C) associated with nearshore areas such as the Wadden Sea.…”

Section: Discussionmentioning

confidence: 99%

Co-occurrence of European sardine (Sardina pilchardus), anchovy (Engraulis encrasicolus) and sprat (Sprattus sprattus) larvae in southern North Sea habitats: Abundance, distribution and biochemical-based condition

Kanstinger

2009

Sci. Mar.

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SUMMARY: Spawning populations of European sardines (Sardina pilchardus) and anchovies (Engraulis encrasicolus)have become re-established in the southern North Sea after a ~30-year absence and now co-occur with sprat (Sprattus sprattus). Consequently, little is known concerning potential interactions among these three species in this region. Based upon parallel cruises conducted in June/July 2005, we compared the larval abundance, size-distributions and biochemical-based condition of these species among 1) nearshore (Wadden Sea) areas and offshore (German Bight) areas that were 2) vertically mixed, 3) frontal zones, or 4) stratified waters. In general terms, larval condition (RNA:DNA) was relatively high at all stations. Although fronts clearly acted to concentrate larvae, larval condition was not necessarily higher. For example 9% of sardines captured at the tidal mixing front were categorised as starving, while no starving larvae were sampled in the stratified water masses. Habitats of sardine and sprat larvae were similar, whereas anchovies were primarily restricted to nearshore areas. This is the first study examining the potential role of near-and offshore habitats as nursery areas and the extent to which resource (habitat) partitioning exists among the larvae of sprat and newly established anchovy and sardine in the North Sea.Keywords: clupeiform fish, larvae, habitats, RNA:DNA, growth. RESUMEN: CO-APARICIÓN DE LAS LARVAS DE SARDINA EUROPEA (SARDINA PILCHARDUS), ANCHOA (ENGRAULIS ENCRASICOLUS) Y ES-PADÍN (SPRATTUS SPRATTUS) EN HÁBITATS DEL SUR DEL MAR DEL NORTE:ABUNDANCIA, DISTRIBUCIÓN Y CONDICIÓN BIOQUÍMICA. -La puesta de la sardina (Sardina pilchardus) y de la anchoa (Engraulis encarsicolus) se han restablecido en el sur del mar del Norte después de casi 30 años de ausencia, apareciendo ahora juntamente con el espadín (Spattus sprattus). Consecuentemente, poco se conoce de las interacciones entre estas tres especies en esta región. Se ha llevado a cabo dos campañas entre Junio y Julio 2005, comparando la abundancia larvaria, distribución de tallas y la relación ARN:ADN de estas tres especies de clupeidos entre: 1) zonas costeras (Mar Wadden) y mar abierto (Bahía Alemana), 2) mezcla vertical, 3) zonas frontales y 4) masas de aguas estratificadas. En términos generales, la condición larvaria (relación ARN:ADN) fue relativamente alta en todas las estaciones. Aunque las zonas frontales actúan claramente como concentradoras de larvas, la condición larvaria no fue necesariamente más alta allí. Por ejemplo, el 9% de las larvas de sardinas capturadas en la zona de mezcla de marea fue clasificada en estado de inanición, mientras que las larvas de sardinas en estado de no inanición fueron capturadas en zonas de masas de aguas estratificadas. El hábitat de las larvas de sardina y de las larvas de espadín fueron más similares entre sí, mientras que las larvas de anchoas fueron encontradas en zonas costeras. Este estudio es el primero en investigar la importancia del hábitat de estas especies en zonas costeras y mar a...

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“…The respective relationships were compared among seasons using analysis of covariance (ANCOVA) models (Somarakis et al 1997). Multiple contrasts were used to test for significant pairwise differences between slopes or intercepts (Somarakis & Nikolioudakis 2007).…”

Section: Age and Growthmentioning

confidence: 99%

“…The growth of European anchovy early larvae has been largely studied in the Mediterranean Sea (Palomera et al 2007, Somarakis & Nikolioudakis 2007, and references therein). Growth of late larvae and juveniles has only recently become a subject of study, and the issue of seasonal variations in growth has been addressed in only a few instances (La Mesa et al 2009, Aldanondo et al 2010, Costalago et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Seasonal changes in growth and condition of anchovy late larvae explained with a hydrodynamic-biogeochemical model simulation

Schismenou¹,

Tsiaras²,

Kourepini³

et al. 2013

Mar. Ecol. Prog. Ser.

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We studied seasonal changes in otolith and somatic growth and condition of anchovy Engraulis encrasicolus late larvae (8−55 mm) from the North Aegean Sea (eastern Mediterranean), hatched during the peak (summer) and end (autumn) of, and also after (winter), the regular anchovy spawning period in the area. Mean growth rate and somatic condition were compared with abiotic and biotic parameters collected in situ (current environment). Additionally, we used the output of a coupled 3D hydrodynamic−biogeochemical model implemented over the broader sampling area to reconstruct the potential conditions that the larvae experienced during their development (environmental history). Growth in length was similar for larvae in summer and autumn (0.80 mm d ). Larval and otolith size at hatching were larger in winter. Otolith microstructure was faint in winter with very narrow increments. Otolith and somatic growth were coupled in autumn and winter, but in summer, when temperature was high, otoliths were significantly larger for the same fish length, age and weight. The biogeochemical model simulation implied that mean plankton productivity was significantly higher during the development of larvae in summer, explaining their higher growth in weight and somatic condition compared to autumn and winter. In situ measured environmental parameters represented a snapshot of ambient conditions at the site and time of sampling and did not adequately explain the seasonal differences in growth and condition.

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Oceanographic habitat, growth and mortality of larval anchovy (Engraulis encrasicolus) in the northern Aegean Sea (eastern Mediterranean)

Cited by 79 publications

References 49 publications

Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity

Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity

Co-occurrence of European sardine (<i>Sardina pilchardus</i>), anchovy (<i>Engraulis encrasicolus</i>) and sprat (<i>Sprattus sprattus</i>) larvae in southern North Sea habitats: Abundance, distribution and biochemical-based condition

Seasonal changes in growth and condition of anchovy late larvae explained with a hydrodynamic-biogeochemical model simulation

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