Comparative Characterization of the Spawning Environments of European Anchovy, &lt;I&gt;Engraulis Encrasicolus&lt;/I&gt;, and Round Sardinella, &lt;I&gt;Sardinella Aurita&lt;/I&gt; (Actinopterygii: Clupeiformes) in the Eastern Coast of Tunisia

Zarrad, Rafik; Alemany, F.; Jarboui, Othman; García, A.; Akrout, Fourat

doi:10.3750/aip2011.42.1.02

Cited by 14 publications

(8 citation statements)

References 29 publications

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“…These data agree with the preference ranges of eggs and larvae for high zooplankton biomass and by the avoidance for low zooplankton biomass values of eggs, highlighted by quotient analysis. Similar findings have been reported in other studies (Regner, 1996;Twatwa et al, 2005;Somarakis & Nikolioudakis, 2007;Zarrad et al, 2012), where the hypothesis was advanced that spawning could occur in areas with high zooplankton concentrations, which provided better conditions for egg and larval survival. Anchovy spawning areas are known to be characterized by a stratified and stable water column, which allows the formation and maintenance of food aggregations.…”

Section: Discussionsupporting

confidence: 91%

Distribution of Engraulis encrasicolus eggs and larvae in relation to coastal oceanographic conditions (the South-western Adriatic Sea case study)

et al. 2018

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Identification of potential spawning and nursery areas of European anchovy (Engraulis encrasicolus) represents an essential step in the management of a resource which is of fundamental importance both for fishery and pelagic trophic web. Egg and larvae occurrence from ichthyoplankton surveys (2012 - 2015) in the South Western Adriatic Sea were examined to understand the mechanisms that control their distribution. Egg and larvae densities varied through the years with the highest values recorded in 2012 and the lowest in 2014. Positive correlations between eggs and larvae with zooplankton were observed. When quotient analysis was used to find relations with environmental and biological variables, the results pointed out an egg preference for depth between 91 and 120 m and an avoidance between 11 and 30 m. Moreover, egg avoidances for high values of chlorophyll-a (> 0.52 mg m-3) and low values of zooplankton biomass (< 199 mg m-2) were highlighted. On the other hand, different ranges of habitat preferences and avoidances were observed for larvae: preference range of depth between 11 and 60 m and avoidance > 151 m; preference for high zooplankton biomass (> 1000 mg m-2) and avoidance for low biomass (< 299 mg m-2). These correlations and the quotient values suggest that egg and larvae distribution in the South-Western Adriatic Sea is mainly driven by food availability and depth.

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Section: Discussionsupporting

confidence: 91%

Distribution of Engraulis encrasicolus eggs and larvae in relation to coastal oceanographic conditions (the South-western Adriatic Sea case study)

et al. 2018

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“…The high concentration of small pelagic larvae during the summer period in the region has been also reported by previous studies carried out in the North east of Tunisia (Koched et al, 2011;Zarrad et al, 2013) and other sectors of the Mediterranean Sea (Koutrakis et al, 2004;Isari et al, 2008). Furthermore, their preference to spawn in the deeper waters near the shelf break (Olivar et al, 2001;Cuttitta et al, 2006;Zarrad et al, 2012b) should explain the higher abundance of their larvae in the offshore stations.…”

Section: Discussionmentioning

confidence: 49%

“…European anchovy Engraulis encrasicolus (Linnaeus, 1758), Sardinella Sardinella aurita (Valenciennes, 1847) (Ktari-Chakroun, 1979;Zarrad et al, 2012aZarrad et al, , 2012b) and on the tuna larvae (Koched et al, 2012(Koched et al, , 2013. However, only two of these studies have actually addressed the whole larval fish assemblage in the eastern coast of Tunisia (Koched et al, 2011;Zarrad et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Environmental conditions influencing the larval fish assemblage during summer in the Gulf of Gabes (Tunisia: South central Mediterranean)

et al. 2015

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An oceanographic survey was carried out during the summer of 2009, from June 25 to July 3 in the Gulf of Gabes. The study area was characterised by a wide continental shelf.A plankton sampling scheme was carried out to study the structure of the larval fish assemblages that characterised the surface mixed layer, and to assess the influence of the environmental parameters on their spatial distribution.A total of 36 taxa were identified, three classified to the level of genus, five to the family and 28 to the species. The majority of identified fish larvae belonged to the demersal species, mainly picarel Spicara smaris (23.76% of the total larval fish abundance), followed by red mullet Mullus barbatus (14.92%) and several species of the Sparidae family (9.15%). Small pelagic species such as Sardinella Sardinella aurita and European anchovy Engraulis encrasicolus were also abundant (27.75%) and dominated the fish larvae community in offshore stations. Five large pelagic species were found among the larvae, including bullet tuna Auxis rochei, Atlantic black skipjack Euthynnus alletteratus, albacore Thunnus alalunga, swordfish Xiphias gladius and the highly migratory Atlantic bluefin tuna Thunnus thynnus. All these apex predator species appear in 38.5% of the sampling stations and contributed to about 7.9% of the total larval catches.The larval fish assemblage of the Gulf of Gabes is predominantly composed of the neritic species in correspondence with the shallow depths of the study area. Canonical Correspondence Analysis (CCA) showed that larval distributions were mainly conditioned by depth. However, other factors, such as, hydrographic processes, also play a very significant role in shaping the spatial pattern of larval fish distribution.

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“…The abundance of E. encrasicolus eggs and larvae seemed to increase from inshore to offshore sites highlighting the preference of this species to deeper waters for spawning as well as nursery areas. Zarrad et al (2012) and Malavolti et al (2018) also observed that spawning area of E. encrasicolus in the eastern coast of Tunisia and the south-western Adriatic Sea was confined to deeper waters and the fish apparently avoided shallower areas. Contrary to Pattrick and Strydom (2014) and Malavolti et al (2018), in our study, the larvae (nursery area) of E. encrasicolus were also confined to deeper waters and their highest abundance was recorded from stations St. 1 and St. 2.…”

Section: 4°c) Which Is In Accordance With the Study Bymentioning

confidence: 82%

Spatial and temporal variation in the distribution and abundance of pelagic fish eggs and larvae off Giresun, south-eastern Black Sea, Turkey

Şahin¹,

Düzgüneş²

2019

Acta Ichthyol. Piscat.

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Comparative Characterization of the Spawning Environments of European Anchovy, <I>Engraulis Encrasicolus</I>, and Round Sardinella, <I>Sardinella Aurita</I> (Actinopterygii: Clupeiformes) in the Eastern Coast of Tunisia

Cited by 14 publications

References 29 publications

Distribution of Engraulis encrasicolus eggs and larvae in relation to coastal oceanographic conditions (the South-western Adriatic Sea case study)

Distribution of Engraulis encrasicolus eggs and larvae in relation to coastal oceanographic conditions (the South-western Adriatic Sea case study)

Environmental conditions influencing the larval fish assemblage during summer in the Gulf of Gabes (Tunisia: South central Mediterranean)

Spatial and temporal variation in the distribution and abundance of pelagic fish eggs and larvae off Giresun, south-eastern Black Sea, Turkey

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