Catch composition and management of daytime purse seine fishery on the Southern Mediterranean Sea Coast, Abu Qir Bay, Egypt

El-Haweet, Alaa Eldin

doi:10.12681/mms.270

Cited by 15 publications

(12 citation statements)

References 2 publications

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“…Similar to adult maps, our habitat adequacy maps for eggs also indicated potential spawning grounds for anchovy in the Gulf of Gabes in Tunisia, which agrees with the limited anchovy ichthyoplankton research in this area (e.g., Zarrad et al. , 2006) as well as the coasts of Egypt (e.g., El Haweet, 2001) and the northeastern corner of the Levantine Basin (e.g., Bariche et al. , 2006).…”

Section: Discussionsupporting

confidence: 83%

Characterizing the potential habitat of European anchovy Engraulis encrasicolus in the Mediterranean Sea, at different life stages

Giannoulaki

Iglesias

Tugores

et al. 2012

Fisheries Oceanography

143

100

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Identification of the potential habitat of European anchovy (Engraulis encrasicolus) at different life stages in relation to environmental conditions is an interesting subject from both ecological and management points of view. For this purpose, acoustic data from different seasons and different parts of the Mediterranean Sea along with satellite environmental and bathymetry data were modelled using generalized additive models. Similarly, egg distribution data from summer ichthyoplankton surveys were used to model potential spawning habitat. Selected models were used to produce maps presenting the probability of anchovy presence (adults, juveniles and eggs) in the entire Mediterranean basin, as a measure of habitat adequacy. Bottom depth and sea surface chlorophyll concentration were the variables found important in all models. Potential anchovy habitats were located over the continental shelf for all life stages examined. An expansion of the potential habitat from the peak spawning (early summer) to the late spawning season (early autumn) was observed. However, the most suitable areas for the presence of anchovy spawners seem to maintain the same size between seasons. Potential juvenile habitats were associated with highly productive inshore waters, being less extended and closer to coast during winter than late autumn. Potential spawning habitat in June and July based on ichthyoplankton surveys overlapped but were wider in extent compared with adult potential habitat from acoustics in the same season. Similarities and dissimilarities between the anchovy habitats as well as comparisons with sardine habitats in the oligotrophic Mediterranean Sea and other ecosystems with higher productivity are discussed.

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Section: Discussionsupporting

confidence: 83%

Characterizing the potential habitat of European anchovy Engraulis encrasicolus in the Mediterranean Sea, at different life stages

Giannoulaki

Iglesias

Tugores

et al. 2012

Fisheries Oceanography

143

100

View full text Add to dashboard Cite

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“…Similarly, in the south part of the basin along the North African coast where information on small pelagic nursery grounds is generally lacking, persistent areas are indicated in the coastal waters of Morocco and Algeria, the Gulf of Gabes in Tunisia and the Nile Delta area (Figs 1, 7 and 8). These areas match the distribution grounds of sardine, as landings information from local fisheries confirm (El Haweet, 2001; Ben Abdallah and Gaamour, 2005; Ramzi et al. , 2006).…”

Section: Discussionmentioning

confidence: 57%

Habitat suitability modelling for sardine juveniles (Sardina pilchardus) in the Mediterranean Sea

Giannoulaki

Pyrounaki

Liorzou

et al. 2011

Fisheries Oceanography

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Identification of potential juvenile grounds of shortlived species such as European sardine (Sardina pilchardus) in relation to the environment is a crucial issue for effective management. In the current work, habitat suitability modelling was applied to acoustic data derived from both the western and eastern part of the Mediterranean Sea. Early summer acoustic data of sardine juveniles were modelled using generalized additive models along with satellite environmental and bathymetry data. Selected models were used to construct maps that exhibit the probability of presence in the study areas, as well as throughout the entire Mediterranean basin, as a measure of habitat adequacy. Areas with high probability of supporting sardine juvenile presence persistently within the study period were identified throughout the Mediterranean Sea. Furthermore, within the study period, a positive relationship was found between suitable habitat extent and the changes in abundance of sardine juveniles in each study area.

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“…During the winter sardine potential habitat appears to be more extended, also covering most of the Moroccan and Algerian coasts. These areas are verified by the known distribution and the fishing grounds of sardine along these coasts (Djabali et al 1991, Ramzi et al 2006, Bedairia & Djebar 2009, the Tunisian and Libyan coastal waters as well as the Nile Delta region along the Egyptian coast (El-Haweet 2001, Ben Abdallah & Gaamour 2005. Further east, the information on the spatial distribution of sardine in the Levantine basin is currently lacking.…”

Section: Discussionmentioning

confidence: 79%

Habitat suitability modelling for sardine Sardina pilchardus in a highly diverse ecosystem: the Mediterranean Sea

Tugores¹,

Giannoulaki²,

Iglesias³

et al. 2011

Mar. Ecol. Prog. Ser.

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Integrated information from different parts of the Mediterranean Sea was used to model the spatial and temporal variability of the distribution grounds of the sardine population. Acoustic data from the North Aegean Sea (Eastern Mediterranean), the Adriatic Sea (Central Mediterranean), the Sicily Channel (Central Mediterranean) and Spanish Mediterranean waters (Western Mediterranean) were analysed along with satellite environmental and bathymetric data to model the potential habitat of sardine during summer, autumn and early winter. Generalized additive models were applied in a presence−absence approach. Models were validated in terms of their predictive ability and used to construct maps exhibiting the probability of sardine presence throughout the entire Mediterranean basin as a measure of habitat adequacy for sardine. Bottom depth and sea surface temperature were the environmental variables that explained most of the data variability. Several areas along the Mediterranean coastline were indicated as suitable habitat for sardine in different seasons. An expansion of these areas over the continental shelf, up to 100 m depth, was consistently noticed from summer to winter. This was attributed to the horizontal movements of sardine related to spawning (i.e. winter period) and the peculiarities of the Mediterranean Sea where areas favouring growth, feeding and spawning processes tend to be localised and prevent a long range, offshore migration as opposed to large upwelling ecosystems. Moreover, within the study period, a positive relationship between the extent of sardine preferred habitat and landings was revealed for both summer and winter seasons throughout the entire Mediterranean Sea.

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Catch composition and management of daytime purse seine fishery on the Southern Mediterranean Sea Coast, Abu Qir Bay, Egypt

Cited by 15 publications

References 2 publications

Characterizing the potential habitat of European anchovy Engraulis encrasicolus in the Mediterranean Sea, at different life stages

Characterizing the potential habitat of European anchovy Engraulis encrasicolus in the Mediterranean Sea, at different life stages

Habitat suitability modelling for sardine juveniles (Sardina pilchardus) in the Mediterranean Sea

Habitat suitability modelling for sardine Sardina pilchardus in a highly diverse ecosystem: the Mediterranean Sea

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