Annual reproductive cycle, spawning periodicity and sexual maturity of false scad Caranx rhonchus (Geoffroy Saint-Hilaire, 1817) (Pisces, Carangidae) from the South-Eastern Mediterranean (Gulf of Gabès, Tunisia)

2015 ◽  
Vol 31 (3) ◽  
pp. 437-441 ◽  
Author(s):  
A. Sley ◽  
A. Hadj Taeib ◽  
O. Jarboui ◽  
M. Ghorbel ◽  
A. Bouain
Keyword(s):  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Eastern Mediterranean ◽  
Annual Reproductive Cycle ◽  
The South ◽  
Gulf Of Gabes ◽  
South Eastern ◽  
Gulf Of Gabès ◽  
Spawning Periodicity

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

scholarly journals Reproductive cycle of Bolinus brandaris (Gastropoda: Muricidae) in the Gulf of Gabès (southern Tunisia)

2013 ◽  
Vol 14 (1) ◽  
pp. 24 ◽  
Author(s):  
K. ELHASNI ◽  
P. VASCONCELOS ◽  
M. GHORBEL ◽  
O. JARBOUI
Keyword(s):  
Reproductive Cycle ◽  
Sexual Maturity ◽  
Fishery Management ◽  
Gonadosomatic Index ◽  
Condition Index ◽  
Spawning Season ◽  
Gonad Maturation ◽  
Gulf Of Gabes ◽  
Gulf Of Gabès ◽  
Bolinus Brandaris

The reproductive cycle of the purple dye murex (Bolinus brandaris) from the Gulf of Gabès was studied through gonad histology and calculation of bio-physiological indices (general condition index - K and gonadosomatic index - GSI). The shell length at first sexual maturity (SL50) of B. brandaris was also investigated using a macroscopic maturation scale. The population sex ratio was statistically unbalanced (M:F = 1:1.5), with a significant dominance of females. Monthly variation in gonad maturation stages, K and GSI revealed that B. brandaris has an annual reproductive cycle, long period of gonadal activity and slight asynchrony between sexes. The spawning season extended between April and July, with a clear spawning peak from May to June. The SL50 was reached at 56.4 mm in females and 54.6 mm in males. At present, B. brandaris has no commercial value in Tunisia, but it is predictable that it will become a fishery-exploited species in the near future. The present data, particularly the timing of spawning season and the size at first sexual maturity, constitute baseline information for the proposal of fishery management measures, aiming to ensure sustainable exploitation and long-term preservation of this alternative fishing resource.

Diversity and abundance of diazotrophic cyanobacteria in the central coastal area of the Gulf of Gabès (South-eastern Tunisia)

2021 ◽  
Vol 42 ◽  
pp. 101653
Author(s):  
Ismail Sabeur Hamza ◽  
Isabelle Biegala ◽  
Amel Bellaaj Zouari ◽  
Fourat Akrout ◽  
Fatma Abdmouleh Keskes ◽  
...  
Keyword(s):  
Coastal Area ◽  
Gulf Of Gabes ◽  
South Eastern ◽  
Gulf Of Gabès ◽  
Diazotrophic Cyanobacteria

scholarly journals High diversified benthic habitats in a tidal Mediterranean sub-tropical environment: the case of the Gulf of Gabès (Tunisia)

2018 ◽  
Author(s):  
Abir Fersi ◽  
Nawfel Mosbahi ◽  
Ali Bakalem ◽  
Jean-Philippe Pezy ◽  
Alexandrine Baffreau ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Tropical Environment ◽  
Gulf Of Gabes ◽  
Annual Cycles ◽  
Gulf Of Gabès ◽  
Zostera Noltei ◽  
Sediment Types ◽  
The Mediterranean ◽  
The Impact

The Gulf of Gabès on the southern coasts of Tunisia in the central part of the Mediterranean is a very shallow basin, characterized by semidiurnal tides, attaining a range of 2.3 m during spring tides. The intertidal zone was covered by extended Zostera (Zosterella) noltei Hornemann, 1832 beds mainly developed around the Kneiss Islands while tidal channels ensured the water circulation in this sub-tropical environment with very low freshwater input and high summer temperature. In spite of protected conventions, the area remained under high human pressures: overfishing, and the impact of the pollution of the phosphate industry. Intensive sampling in both intertidal and shallow subtidal zones during annual cycles permitted to identify a rich macrofauna which increase considerably the species known in this eastern part of the Mediterranean Sea. More than 50 species are added for the Tunisian fauna. Moreover, patterns of diversity are analysed with the sediment types, presence or absence of Zostera noltei seagrass bed, and human pressures. The list of the collected species are compared with those of surrounding areas in both Western and Eastern Mediterranean Sea.

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