The reproductive biology of the grey triggerfish Balistes capriscus (Pisces: Balistidae) in the Gulf of Gabès (south-eastern Mediterranean Sea)

2014 ◽  
Vol 94 (7) ◽  
pp. 1531-1537 ◽  
Author(s):  
Hichem Kacem ◽  
Lassâd Neifar
Keyword(s):  
Mediterranean Sea ◽  
Reproductive Biology ◽  
Eastern Mediterranean ◽  
Fork Length ◽  
Hepatosomatic Index ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
South Eastern ◽  
Gulf Of Gabès ◽  
Balistes Capriscus

Fundamental information on the reproductive biology of the grey triggerfish Balistes capriscus from the Gulf of Gabès (south-eastern Mediterranean Sea) is based on 751 specimens, collected between June 2005 and May 2010, from commercial catches at different fishing ports at Chebba (34°14′N 11°06′E), Kerkennah (34°45′N 11°17′E) and Zarzis (33°41′N 11°48′E). The species were caught in this area using pelagic trawl nets. The calculation of the gonadosomatic index suggested that the spawning season of grey triggerfish occurred mainly between July and mid-September with a peak in July, coinciding with summer time. The first maturation occurred at 20.26 cm fork length for females and 21.3 cm fork length for males. The monthly values of hepatosomatic index and condition factor (K) indicated that the liver was the most severely stressed organ in the reproduction process of energy transfer. The absolute fecundity (F) ranged from 290,120 to 984,990 eggs per female. The fecundity of the species was determined by the size and weight of the individuals.

Ostreopsis cf. ovata in the Gulf of Gabès (south-eastern Mediterranean Sea): morphological, molecular and ecological characterization

Harmful Algae ◽  
2017 ◽  
Vol 63 ◽  
pp. 56-67 ◽  
Author(s):  
Moufida Abdennadher ◽  
Amel Bellaaj Zouari ◽  
Wafa Feki Sahnoun ◽  
Elsa Alverca ◽  
Antonella Penna ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
South Eastern ◽  
Gulf Of Gabès

High-resolution numerical modelling of the barotropic tides in the Gulf of Gabes, eastern Mediterranean Sea (Tunisia)

2017 ◽  
Vol 129 ◽  
pp. 224-232 ◽  
Author(s):  
Achref Othmani ◽  
Béchir Béjaoui ◽  
Cristèle Chevalier ◽  
Dalila Elhmaidi ◽  
Jean-Luc Devenon ◽  
...  
Keyword(s):  
High Resolution ◽  
Numerical Modelling ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

scholarly journals Synthesis review of the Gulf of Gabes (eastern Mediterranean Sea, Tunisia): Morphological, climatic, physical oceanographic, biogeochemical and fisheries features

2019 ◽  
Vol 219 ◽  
pp. 395-408 ◽  
Author(s):  
Béchir Béjaoui ◽  
Sana Ben Ismail ◽  
Achref Othmani ◽  
Olfa Ben Abdallah-Ben Hadj Hamida ◽  
Cristèle Chevalier ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Gulf Of Gabes ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

Copepod community structure related to environmental factors from a summer cruise in the Gulf of Gabès (Tunisia, eastern Mediterranean Sea)

2009 ◽  
Vol 90 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Zaher Drira ◽  
Malika Belhassen ◽  
Habib Ayadi ◽  
Asma Hamza ◽  
Rafik Zarrad ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Sampling Period ◽  
Trophic Levels ◽  
Copepod Community ◽  
Gulf Of Gabes ◽  
Small Copepod ◽  
Eastern Mediterranean Sea ◽  
Gulf Of Gabès

We studied the summer spatial distribution of the copepod community in both the neritic and oceanic areas of the Gulf of Gabès (Tunisia, eastern Mediterranean Sea) coupled with environmental factors. Copepods were the most abundant zooplankton throughout the sampling period, contributing 78% of the total zooplankton. A total of 14 copepod families were identified in all stations, with an overwhelming abundance of Acartiidae and Oithonidae (39.05 and 39.09% of total abundance, respectively). Abundance of Acartia clausi and chlorophyll-a concentrations were negatively correlated with salinity, suggesting that this species probably escaped the high coastal salinity (38 psu). Significant correlation determined between A. clausi and tintinnids at 50 m isobaths indicates that these planktonic ciliates probably served as a substantial food link towards higher trophic levels of this area. Conversely, Oithona nana which was well adapted to high chlorophyll-a concentrations and high salinity along the coast, showed significant correlations with Dictyochophyceae, Dinophyceae, Bacillariophyceae and Euglenophyceae, suggesting that this small copepod was capable of feeding on a wide selection of phytoplankton preys.

Age, growth and longevity of the grey triggerfish, Balistes capriscus Gmelin, 1789 (Teleostei, Balistidae) in the Gulf of Gabès, southern Tunisia, Mediterranean Sea

2015 ◽  
Vol 95 (5) ◽  
pp. 1061-1067 ◽  
Author(s):  
Hichem Kacem ◽  
Lobna Boudaya ◽  
Lassâd Neifar
Keyword(s):  
Mediterranean Sea ◽  
Growth Parameters ◽  
Fork Length ◽  
Growth Zone ◽  
Age And Growth ◽  
Gulf Of Gabes ◽  
Gulf Of Gabès ◽  
Southern Tunisia ◽  
Balistes Capriscus ◽  
Males And Females

The age and growth parameters of grey triggerfish, Balistes capriscus from the Gulf of Gabès, southern Tunisia, Mediterranean Sea, were estimated from the first dorsal spine sections of 463 specimens (206 males and 257 females), whose fork length was between 139 and 427 mm and the total weight ranged from 90.04 to 1967.41 g. The monthly percentage of specimens having a terminal translucent zone has indicated that the growth zone is formed once a year, during the cold season (February). The von Bertalanffy growth equations were: FL = 420.7 [1 − e−0.233(t + 0.123)] and FL = 417.0 [1 − e−0.238(t + 0.074)], for males and females, respectively. The longevity estimated was 13 years old for both sexes. The instantaneous mortality rates were estimated to 0.23 for males and 0.24 for females. The weight–length relationships of the grey triggerfish were Wt = 21.510−3 LF3.046 and Wt = 41.010−3 LF2.835, for males and females, respectively.

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