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Diet composition for three sciaenids caught off northeastern Brazil

Mortality of early life stages of European pilchard Sardina pilchardus along the Atlantic Coast of Northwest Africa (22°30’N-26°N)

Authors

CORRESPONDING

Hinde Abdelouahab

hind.abdelouahab@gmail.com

1

1

University Hassan II, Faculty of Sciences Ain Chock, B.P 5366 Maarif 20000, Casablanca, Morocco

Amina Berraho

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2

National Institute of Marine Research, 2 Sidi Abderrahmane, Casablanca, Morocco

Azeddine Ramzi

2

2

National Institute of Marine Research, 2 Sidi Abderrahmane, Casablanca, Morocco

Omar Ettahiri

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2

National Institute of Marine Research, 2 Sidi Abderrahmane, Casablanca, Morocco

Ahmed Errhif

1

1

University Hassan II, Faculty of Sciences Ain Chock, B.P 5366 Maarif 20000, Casablanca, Morocco

Naoki Tojo

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3

Japan International Cooperation Agency (JICA), Expert of Resource Dynamics Analyses and Monitoring, National Institute of Marine Research, Casablanca, Morocco

Abstract

The purpose of this study was to estimate the natural mortality of embryonic and larval stages of European pilchard Sardina pilchardus along the Atlantic Coast of Northwest Africa between Cape Barbas (22°30’N) and Cape Bojador (26°N) during November 2007. Using planktonic data that were fitted to an exponential model, sardine eggs hourly mortality rate (Z) was estimated in 0.07 (per hour) corresponding to 83.5% of daily mortality rate. On the other hand, for sardine larvae, Z was estimated in 0.01 (per hour), corresponding to a daily mortality rate of 21.4%. Southward and offshore transport can be considered as causes of variability in drifting scenario and survival condition of sardine larvae. Additional analyses of time series of the early life history data of sardines and future adaptive monitoring should be conducted to better manage sardine fisheries in Morocco.

Key words

Sardine, eggs, larvae, mortality, Northwest Africa

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