Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)

Hajjej, Ghailen; Hattour, Abdallah; Allaya, Hassen; Jarboui, Othman; Bouaïn, Abderrahmen

doi:10.4067/s0718-19572010000300004

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…These differences between the Mediterranean and oceanic populations in the duration of the spawning season are also found in other species. For example, it has been reported that the spawning period of little tunny Euthynnus alletteratus (Rafinesque, 1810) in the central Mediterranean Sea is between June and September (Hajjej et al , 2010), whereas in the Atlantic Ocean the spawning season is between about April and November (Collette & Nauen, 1983). Likewise, the spawning period of the swordfish Xiphias gladius is shorter, between June and August, in the western Mediterranean Sea (De la Serna et al ., 1996) and between December and June in the north-west Atlantic Ocean (Arocha & Lee, 1996).…”

Section: Discussionmentioning

confidence: 99%

Some aspects of the reproductive biology of albacore Thunnus alalunga from the western Mediterranean Sea

et al. 2015

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Thunnus alalunga is an important commercial tuna species widely distributed in the three major oceans and the Mediterranean Sea. The Mediterranean population is currently classified as a data-poor stock and little is known about its basic life history parameters. This study provides the first detailed information on some aspects of the reproductive biology of T. alalunga from the western Mediterranean Sea. A total of 16 104 specimens were measured between 2005 and 2012. The overall sex ratio of females to males was 1.1:1, although the ratio was female biased in fish <70 cm fork length (LF) and male biased in those >75 cm LF. Histological analysis of the ovaries (N = 587) and the monthly variation of the gonadosomatic index for both sexes showed that spawning occurred from June to August, which is a much shorter period than the 7 months reported for T. alalunga in tropical oceanic waters. Thunnus alalunga caught during June and July are capable of spawning daily. The gonadosomatic index values for T. alalunga from the western Mediterranean were up to eight times higher than those of T. alalunga from other oceans. Histological examination of the ovaries showed that the minimum length at sexual maturity of females was 56 cm LF, which is considerably smaller than those estimated for other stocks.

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Section: Discussionmentioning

confidence: 99%

Some aspects of the reproductive biology of albacore Thunnus alalunga from the western Mediterranean Sea

et al. 2015

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“…If the existing information between ETA and NETAM areas is compared, in a study carried out in the ETA area, a very extensive spawning period is observed, which occupies practically the whole year [47]. However, in the Mediterranean Sea, the period is quite seasonal and limited, coinciding with the warmer period, between the months of June and August [49][50][51]69]. However, both biological aspects must be studied in depth in the future.…”

Section: Discussionmentioning

confidence: 99%

Differentiation of Spatial Units of Genus Euthynnus from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis

Muñoz‐Lechuga

Sow

Constance

et al. 2023

Fishes

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The shape of sagitta otoliths was used to compare individuals of little tunny (Euthynnus alleteratus) harvested on board commercial fishing vessels from the coastal areas along the Eastern Atlantic, including the Mediterranean Sea. Fish sampling and selection was designed to cover possible seasonal changes and tuna size. The research encompassed both morphometric and shape analyses of left sagittal otoliths extracted of 504 fish specimens. Four shape indices (Circularity, Roundness, Rectangularity, and Form-Factor) were significantly different between two groups, showing a statistical differentiation between two clear spatial units. The degree of divergence was even more pronounced along the rostrum, postrostrum, and excisura of the generated otolith outlines between these two groups. One group corresponds to the samples from the coastal areas in the Northeast Temperate Atlantic and Mediterranean Sea (NETAM Area) and a second group from the coastal areas off the Eastern Tropical Atlantic coast of Africa (ETA Area). This study is the first to use otolith shape to differentiate tunas from separate spatial units. These results could be used to re-classify previously collected samples and to correct time series of data collected.

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“…Ikan tongkol merupakan sumberdaya hayati laut yang memiliki potensi nilai ekonomi cukup tinggi (Prayoga dkk., 2017). Ikan tongkol (Auxis sp) merupakan jenis ikan pelagis besar dan perenang cepat yang hidup secara bergelombol (Sompie, 2011;Hajjej et al, 2010;Sulistyaningsih et al, 2014). Pola kehidupan ikan tongkol tidak bisa dipisahkan dari adanya berbagai kondisi lingkungan, parameter oseanografi seperti suhu permukaan laut, salinitas, konsentrasi klorofil laut, cuaca dan sebagainya serta perubahan musim akan mempengaruhi kehidupan dan pertumbuhan ikan tongkol (Jalil, 2013).…”

Section: Pendahuluanunclassified

Perbandingan Produktivitas Pancing Ulur (HandLine) Dan Jaring Insang (Gill net) Nelayan Desa Kusamba, Klungkung, Bali Terhadap Hasil Tangkapan Ikan Tongkol (Auxis sp.)

Aryasuta

Dirgayusa

Puspitha

2020

J. Mar. Aquat. Sci.

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This study uses two environmentally friendly fishing gears namely gill net and hand line. The length of one set of hand line is 100 m and the length of one set of gill nets is 250 m. The purpose of this study was to determine the number of catches, species composition of catches and the efficiency of fishing gear that provided benefits for the fishermen of Kusamba Village. This data collection was carried out in field plunge directly with fishermen using the one day trip method for 35 trips during the tuna fishing season by Kusamba Village fishermen. Auxis sp is one type of fish that is the main target of the catch of fishermen in Kusamba Village. Auxis sp often follows the current circulation, the catch of Auxis sp on the fishermen of Kusamba Village has a different amount of production every day. In terms of Auxis sp catches by Kusamba Village Fishermen who use two fishing gear are dominated by gill nets and the quality aspect is dominated by hand linecatches. It is known that there are two types of tuna, namely Auxis rochei and Auxis thazard. The catch is in principle the output of fishing activities, while the effort needed in principle is an input from the fishing activities, fisheries production in an area has increased or decreased can be seen from the results of CPUE. The highest CPUE value of gill nets is 53.75 tails / effort, the highest CPUE value of hand line is 75 tails / effort.

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Biology of little tunny Euthynnus alletteratus in the Gulf of Gabes, Southern Tunisia (Central Mediterranean Sea)

Cited by 8 publications

References 7 publications

Some aspects of the reproductive biology of albacore Thunnus alalunga from the western Mediterranean Sea

Some aspects of the reproductive biology of albacore Thunnus alalunga from the western Mediterranean Sea

Differentiation of Spatial Units of Genus Euthynnus from the Eastern Atlantic and the Mediterranean Using Otolith Shape Analysis

Perbandingan Produktivitas Pancing Ulur (HandLine) Dan Jaring Insang (Gill net) Nelayan Desa Kusamba, Klungkung, Bali Terhadap Hasil Tangkapan Ikan Tongkol (Auxis sp.)

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