Analyses of the sex ratio for bullet tuna, Atlantic bonito and little tunny from Portuguese and Spanish waters

Saber, Sámar; Urbina, Josetxu Ortiz de; Lino, Pedro G.; Gómez-Vives, M.J.; Godoy, L; Coelho, Rui; Ciércoles, Cristina; Muñoz‐Lechuga, Rubén; Macías, David

doi:10.3389/conf.fmars.2019.08.00195

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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%

“…According to the ICCAT official catch statistics, this species account for a significant proportion of the total small tuna species production, representing in the last years around 15% of the total catch [37]. Diverse biological information on this species is available focusing on age and growth [38][39][40][41][42][43][44], reproduction [45][46][47][48][49][50][51], and stock assessment [32,35]. However, concerning stock structure, there are some knowledge gaps with a lack of concise information on this species [43,44].…”

Section: Introductionmentioning

confidence: 99%

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

Muñoz‐Lechuga

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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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Section: Discussionmentioning

confidence: 99%