First Biological Data on the Well Established Lessepsian Migrant Fistularia commersonii (Fistulariidae) in the Gulf of Tunis (Central Mediterranean)

Abstract Despite the high commercial value of the striped seabream Lithognathus mormyrus (Linnaeus, 1758) in the Gulf of Tunis, biological data on its age, growth and exploitation rate are lacking. With the aim of estimating growth parameters, 516 individuals, ranging from 6–27.5 cm total length and from 3.5–293.5 g total weight, were collected from the artisanal fishing fleet between February 2014 and July 2016. The somatic growth presented a positive allometry and was described by the equation TW = 6.54 10−3TL3.213. The monthly analysis of the marginal increment of the otoliths revealed that only one annulus was deposited per year. The estimated von Bertalanffy growth parameters were: L∞ = 30.18 cm, k = 0.303 year−1 and t0 = −1.42 years. Total and natural instantaneous rates of mortality were respectively Z = 0.784 year−1 and M = 0.698 year−1. Exploitation rate (E = 0.1) showed that the Gulf of Tunis stock of L. mormyrus is not overexploited. The estimated length class giving highest yield (Lopt) was 17.15 ± 1.71 cm.

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A new settled population of the lessepsian migrant Siganus luridus (Pisces: Siganidae) in Linosa Island—Sicily Strait

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315404009993h ◽

2004 ◽

Vol 84 (4) ◽

pp. 819-821 ◽

Cited By ~ 27

Author(s):

Ernesto Azzurro ◽

Franco Andaloro

Keyword(s):

Mediterranean Sea ◽

New Record ◽

Biological Data ◽

Central Mediterranean ◽

Central Mediterranean Sea

The lessepsian migrant Siganus luridus appeared along the shallower waters of the Pelagie Islands (central Mediterranean Sea). This is a new record of the species based on the capture of 40 specimens in Linosa Island during the summer of 2003. Some biological data are given and the relevance of this finding from the Sicily Strait is discussed.

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A new species of Flabelligeridae (Annelida), Trophoniella radesiensis n. sp., from Tunisia

Zootaxa ◽

10.11646/zootaxa.4571.4.7 ◽

2019 ◽

Vol 4571 (4) ◽

pp. 551

Author(s):

MARWA CHAIBI ◽

MOUNA ANTIT ◽

MARWA BOUHEDI ◽

MIGUEL A. MECA ◽

PATRICK GILLET ◽

...

Keyword(s):

New Species ◽

Genetic Distance ◽

Posterior Region ◽

Central Mediterranean ◽

Gulf Of Tunis ◽

The Family ◽

First Time ◽

A New Species

The family Flabelligeridae was previously represented in Tunisia by four genera including four species: Bradabyssa villosa (Rathke, 1843), Therochaeta flabellata (M. Sars in G.O. Sars, 1872), Pherusa plumosa (Müller, 1776), and Piromis eruca (Claparède, 1869). In this paper we report a fifth genus, Trophoniella, for the first time in Tunisia. The specimens were collected in Radés Station, Gulf of Tunis (Central Mediterranean) and belong to a new species, namely Trophoniella radesiensis n. sp., which is characterized by having: (1) a very smooth tunic, body covered dorsally, ventrally, and laterally by sediment grains (except in the posterior region), and (2) well-developed parapodia showing short neurohooks from chaetiger 6 to 19 and anchylosed neurohooks from chaetiger 20. Based on the 16S, the new species belongs to a low supported Piromis/Trophoniella clade and shows a 16.1% of genetic distance from Trophoniella hephaistos Jimi & Fujiwara, 2016, the single known species of the genus sequenced to date. [Zoobank lsid: urn:lsid:zoobank.org:act:D7C85C70-87FF-4AF4-8599-A8462B3FB8B1]

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Growth and age estimation of the greater forkbeard, Phycis blennoides (Actinopterygii: Gadiformes: Phycidae), from the Gulf of Tunis (central Mediterranean)

Acta Ichthyologica Et Piscatoria ◽

10.3750/aip2016.46.1.03 ◽

2016 ◽

Vol 46 (1) ◽

pp. 25-32 ◽

Cited By ~ 3

Author(s):

A. Romdhani

Keyword(s):

Age Estimation ◽

Central Mediterranean ◽

Gulf Of Tunis

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Feeding habits of Pagellus acarne (Sparidae) in the Gulf of Tunis, central Mediterranean

Scientia Marina ◽

10.3989/scimar.2009.73n4667 ◽

2009 ◽

Vol 73 (4) ◽

pp. 667-678 ◽

Cited By ~ 10

Author(s):

Rafika Fehri-Bedoui ◽

Emna Mokrani ◽

Oum Kalthoum Ben Hassine

Keyword(s):

Feeding Habits ◽

Central Mediterranean ◽

Gulf Of Tunis

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Reproductive biology of four Diplodus species Diplodus vulgaris, D. annularis, D. sargus sargus and D. puntazzo (Sparidae) in the Gulf of Tunis (central Mediterranean)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315411000798 ◽

2011 ◽

Vol 92 (3) ◽

pp. 623-631 ◽

Cited By ~ 22

Author(s):

N. Mouine ◽

P. Francour ◽

M.H. Ktari ◽

N. Chakroun-Marzouk

Keyword(s):

Gonadosomatic Index ◽

Spawning Season ◽

Sexual Cycle ◽

Hepatosomatic Index ◽

Central Mediterranean ◽

Important Species ◽

Spawning Period ◽

Gulf Of Tunis ◽

Sharpsnout Seabream ◽

First Maturity

The reproductive features of four commercially important species of the Diplodus genus were studied in the Gulf of Tunis to contribute to better fisheries management on the local scale. The study was specifically aimed to estimate sex-ratio and size at first maturity, to determine spawning season, to analyse hepatic and muscular energy reserve changes and to highlight possible regional difference over the Diplodus geographical distribution. A total of 570 Diplodus vulgaris (two-banded seabream), 428 Diplodus annularis (annular seabream), 350 Diplodus sargus sargus (white seabream) and 218 Diplodus puntazzo (sharpsnout seabream) were collected from the commercial catches of the artisanal fleet between October 2004 and June 2006. Male:female ratio was initially skewed in favour of females for the four Diplodus species and especially among larger-sized individuals. Length and age at first maturity was 17.4 ± 0.2 cm total length (TL) (4 years) for D. vulgaris, 9.7 cm TL (2 years) for D. annularis, 21.0 ± 0.3 cm TL (4 years) for D. s. sargus, 21.5 ± 0.2 cm TL (3 years) for D. puntazzo and a recommendation is made for the increasing of the captured length. According to the monthly succession of gonad maturity stages and the yearly gonadosomatic index (GSI) fluctuation, the spawning season of Diplodus species present a temporal succession along the year. The two-banded seabream has a winter spawning period, the white seabream is mainly a spring spawner, the annular seabream spawns essentially in summer months and the spawning of sharpsnout seabream takes place in autumn. Generally, hepatosomatic index presented an inverse trend to GSI in relation to the breeding activity. The condition factor showed significant monthly variations affected by the sexual cycle of the Diplodus species.

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