Biometry, Length-length and Length-weight Relationships of Little Tuna Euthynnus alletteratus in the Tunisian Waters

Hajjej, Ghailen; Hattour, Abdallah; Hajjej, Abdelhafidh; Allaya, Hassen; Jarboui, O.; Bouaïn, Abderrahmen

doi:10.3923/jfas.2011.256.263

Cited by 18 publications

(16 citation statements)

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“…But it is slightly less than that obtained in North Tunisia and from South Tunisia, Zarzis by Hajjej et al (2011).These differences could be due to the sampling procedure, namely size and length range or related to seasonal reproduction or feeding activities or using data not derived from all seasons in equal proportions (Wootton, 1990).…”

Section: Discussionmentioning

confidence: 66%

Reproductive Biology of little tunny, Euthynnus alletteratus (Rafinesque 1810) in the Eastern Coast of Alexandria, Egypt

Mohamed

El-Haweet

Sabry

2014

Egypt. J. of Aquatic Biolo. and Fish.

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Reproductive biology of Euthynnus alletteratus was described based on 628 fishes that were collected from Abu Qir landing site between October 2006 and September 2007. Only 146 specimens were sexually distinguished (102 females, 44 males) and the others were immature. The sex ratio was estimated as M: F 1:2.3. Size at first sexual maturity was estimated as 42cm. Spawning season was investigated based on monthly observation of gonadal maturity stages and gonad-somatic index (GSI). The spawning season extends from June to August with a highest GSI value in June.The fork length (FL)-gutted weight (GW) relationship was estimated as GW=0.052 FL 2.639 for combined sexes. Condition factor (K) was calculated using the gutted weight of all samples (regardless of sex) with an average of 1.3. Management plan is important to overcome the high percentage of immature fishes in the catch off Alexandria water. Extending closed season to July and increasing the length at capture to 44cm are important for enhancing the chance of spawning at least once during its life.

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Section: Discussionmentioning

confidence: 66%

Reproductive Biology of little tunny, Euthynnus alletteratus (Rafinesque 1810) in the Eastern Coast of Alexandria, Egypt

Mohamed

El-Haweet

Sabry

2014

Egypt. J. of Aquatic Biolo. and Fish.

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“…The tagging results indicated the possibility of E. alletteratus migrating from the Mediterranean to the Atlantic Ocean (Rey and Cort, 1981). Hajjej et al (2011) found significant differences in the morphometric characteristics among E. alletteratus caught from two areas of Tunisia (Teboulbah-North part, Zarzis-South part). These differences were mainly related to the maximum body height, head length and snout length.…”

Section: Discussionmentioning

confidence: 82%

“…Hajjej et al. () found significant differences in the morphometric characteristics among E. alletteratus caught from two areas of Tunisia (Teboulbah‐North part, Zarzis‐South part). These differences were mainly related to the maximum body height, head length and snout length.…”

Section: Discussionmentioning

confidence: 99%

“…Although these species are commonly exploited in Turkish waters, little information is available on their biology except on age and growth (Karakulak and Oray, ), feeding (Karakulak et al., ), movements (De Metrio et al., ; Rooker et al., ) and reproduction (Karakulak et al., ; Corriero et al., ; Heinisch et al., ; Kahraman et al., ). Some biometry description of T. thynnus and E. alletteratus from the western Mediterranean Sea and Atlantic Ocean were reported (Frade, ; Genovese, ; Hajjej et al., , ; Tičina et al., ; Addis et al., ). However, the morphological traits of the early life of stages T. thynnus and E. alletteratus in the eastern Mediterranean Sea are unknown.…”

Section: Introductionmentioning

confidence: 99%

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Morphometric differentiation between two juvenile tuna species [Thunnus thynnus (Linnaeus, 1758) and Euthynnus alletteratus (Rafinesque, 1810)] from the Eastern Mediterranean Sea

et al. 2016

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Summary The main objective of this study was to analyse the differences in morphometric characteristics among specimens of Atlantic juvenile bluefin tuna Thunnus thynnus [12.2–46.5 cm fork length (FL)] and juvenile little tuna Euthynnus alletteratus (14.1–26.4 cm FL). A total of 353 bluefin tuna (young of the year) and 288 little tuna (young of the year) were collected from the commercial hand line fisheries in the eastern Mediterranean Sea between July and October of 2011–2013 with three round‐bent hook sizes (numbers 10, 12 and 14; Mustad 2315S). By using univariate and multivariate analysis, 11 morphometric characters were investigated. anova revealed highly significant differences (P < 0.001) for all morphometric parameters among the two species. The principal component analysis showed that the difference between the species resulted mainly from preanal length (LA), caudal fin hight (CC), snout length (SnL), eye diameter (ED) and postorbital length (PO). The stepwise discriminant analysis revealed that juveniles of the two tuna species were correctly classified, with a percentage of 99.2%. Length of pectoral fin (LP) was the strongest predictor in the discriminant functions.

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“…forskalli and A. nurse in Lower River Benue, [13,14] studied the length-weight relationships of C. nigrodigitatus and B. docmac, from Lake Akata, Benue State, Nigeria. Other researchers such as [15], [16], [17],and [18], have studied the length-length and length-weight relationships of various fish species from different waters.…”

Section: Introductionmentioning

confidence: 99%

Length-Weight Relationship and Condition Factor of Auchenoglanis occidentalis (VALENCIENNES, 1775) from Lake Akata, Benue State, Nigeria.

2013

IOSR-JAVS

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Biometry, Length-length and Length-weight Relationships of Little Tuna Euthynnus alletteratus in the Tunisian Waters

Cited by 18 publications

References 0 publications

Reproductive Biology of little tunny, Euthynnus alletteratus (Rafinesque 1810) in the Eastern Coast of Alexandria, Egypt

Reproductive Biology of little tunny, Euthynnus alletteratus (Rafinesque 1810) in the Eastern Coast of Alexandria, Egypt

Morphometric differentiation between two juvenile tuna species [Thunnus thynnus (Linnaeus, 1758) and Euthynnus alletteratus (Rafinesque, 1810)] from the Eastern Mediterranean Sea

Length-Weight Relationship and Condition Factor of Auchenoglanis occidentalis (VALENCIENNES, 1775) from Lake Akata, Benue State, Nigeria.

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