Growth and age estimation of greater fork-beard (Phycis blennoides Brünnich, 1768) in the north and northwest of the Iberian Peninsula (ICES Division VIIIc and IXa)

Casas, J. M.; Piñeiro, C.

doi:10.1016/s0165-7836(00)00108-9

Cited by 21 publications

(19 citation statements)

References 4 publications

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“…A similar pattern, although with different modal length, characterizes also the Atlantic populations (Casas and Pineiro, 2000) Recruit growth rates obtained in different areas of the Mediterranean from modal progression analysis, show a high consistency. Young recruits collected by Bilio (1969) (Fanciulli and Relini Orsi,1980).…”

Section: Discussionsupporting

confidence: 53%

A procedure to evaluate the effect of lag-time in studying length structure and growth rate of young fish: the case of <i>Phycis blennoides</i> Brunnich, 1768 (Osteichthyes: Gadiformes) in the Central Mediterranean

Ragonese¹,

Fiorentino²,

Rinelli

et al. 2002

Sci. Mar.

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SUMMARY: The joint analysis of data from different programs represents a good opportunity to improve knowledge about the condition of any exploited populations. This note investigates the influence of lag-time in sample characteristics (growth rate and recruitment) by following a simple and quick exploratory procedure. In order to illustrate this approach, the Greater Fork-beard (Phycis blennoides Brunnich, 1768), a species with discrete recruitment pattern and available to the capture process in the first years of life, was considered . The length-frequency distributions (LFD), obtained during five spring (MEDITS -International) and successive autumn (GRUND -Italian) bottom trawl surveys, conducted from 1994 to 1998, in the Strait of Sicily and Southern Tyrrhenian Sea (Mediterranean) were analysed. The procedure was divided into three steps. Firstly, the LFD were analysed in order to estimate the mean length of the first component in each survey. Secondly, for each survey, the difference between the standardized mean lengths of the first components in the LFD of the two areas was compared with the corresponding lag-time in order to assess any systematic temporal effect in recruitment periodicity. Thirdly, for each area, the absolute and instantaneous growth rates between the spring and autumn surveys of the same year were computed on the base of the lag-time, to evaluate any difference in growth rate between the areas. The results show that the earlier the surveys begin in the Strait of Sicily, the smaller is the difference in mean length. Since the growth rates between the two areas are practically indistinguishable, the higher mean lengths observed in samples from the Strait of Sicily mainly reflect the lag-time. The reference mean growth rate found (1.03 and 0.93 cm per month in the Strait of Sicily and Southern Tyrrhenian Sea, respectively) agreed with the literature. In spring, the recruits of 0 group represent up to 90% of the whole trawl catch, and the smallest length class observed (4.5-5.0 cm) is close to the size of transition from the pelagic to the demersal one. The proposed exploratory procedure shows that systematic differences between the two investigated sub-areas in mean size and growth rate suggested by actual data are strongly reduced after having included the lag-time in the analysis.

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Section: Discussionsupporting

confidence: 53%

A procedure to evaluate the effect of lag-time in studying length structure and growth rate of young fish: the case of <i>Phycis blennoides</i> Brunnich, 1768 (Osteichthyes: Gadiformes) in the Central Mediterranean

Ragonese¹,

Fiorentino²,

Rinelli

et al. 2002

Sci. Mar.

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“…The forkbeard showed sexual dimorphism in growth and while this is the common feature among related gadiform species such as P. blennoides (Casas and Piñeiro, 2000), this was not the case for the Azorean specimens (Abecasis et al, 2009). In addition, when comparing the parameters obtained by this study with those obtained by Abecasis et al (2009), we become aware of large differences in L ∞ , K and t 0 .…”

Section: Discussionmentioning

confidence: 91%

“…For example, combination of several techniques, like grinding, sawing, burning and/or slicing, is necessary before the growth increments become visible (Matarrese et al, 1998;Casas and Piñeiro, 2000;Abecasis et al, 2009). This increased complexity in otolith preparation for precise age estimation motivated the 0165-7836/$ -see front matter © 2011 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Age, growth and validation of otolith morphometrics as predictors of age in the forkbeard, Phycis phycis (Gadidae)

Matić‐Skoko¹,

Ferri²,

Škeljo³

et al. 2011

Fisheries Research

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“…Although the “demersal check ring” is known for several species ( Phycis phycis, P. blennoides ; Abecasis, Canha, Reis, Pinho, & Gil‐Pereira, ; Casas & Piñeiro, ; Romdhani, Ktari, Dufour, Mahe, & Francour, ), it was never described for H. dactylopterus in previous literature.…”

Section: Discussionmentioning

confidence: 99%

Population pattern and dynamics of the Bluemouth Helicolenus dactylopterus (Delaroche, 1809) in the eastern Mediterranean Sea

et al. 2018

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Summary Present study evaluated the population status of the Bluemouth (Helicolenus dactylopterus) population distributed in the Antalya Bay for the first time, within the scope of two different surveys carried out in monthly basis, between September 2009 and June 2011 (200–900 m). In accordance with the major availability of the food, 80.9% of the total catch (in number) of the species at the upper slope (200–499 m). The 80.8% of all recruits’ specimens inhabits between 200 and 399 m while 72% of the total spawner specimens (TL ≥ 20 cm) inhabits at depths of between 600 and 799 m. Highest average abundance of the species was estimated 1,060 n/km2 (400 m), while the highest average biomass was 93 kg/km2 (600 m). Lengths of individuals ranged from 4 to 36 cm, and estimated ages from 0 to 27 years. Parameters of the von Bertalanffy growth curves were L∞ = 34.14 cm, K = 0.09 year−1, and t0 = −1.28 years. Margin band analysis confirmed the formation of a single growth annulus per year. In the central part of the otolith, close to the nucleus, a strongly marked check ring is formed which presenting first time for this species in the literature. The duration of the spawning stage for the females was observed between December and February. Selectivity rate of the commercially used 44 mm diamond codend mesh, with a 7.4 cm catch size, found to be very low for the species (a first spawning size of 17–20 cm). The stock of Bluemouth in the Antalya Bay was considered in above reference levels and in high abundance status due to estimated low fishing mortality (0.067−1), exploitation rate status below reference level (0.207−1) and Fcurr is very low than reference point (0.219−1).

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Growth and age estimation of greater fork-beard (Phycis blennoides Brünnich, 1768) in the north and northwest of the Iberian Peninsula (ICES Division VIIIc and IXa)

Cited by 21 publications

References 4 publications

A procedure to evaluate the effect of lag-time in studying length structure and growth rate of young fish: the case of <i>Phycis blennoides</i> Brunnich, 1768 (Osteichthyes: Gadiformes) in the Central Mediterranean

A procedure to evaluate the effect of lag-time in studying length structure and growth rate of young fish: the case of <i>Phycis blennoides</i> Brunnich, 1768 (Osteichthyes: Gadiformes) in the Central Mediterranean

Age, growth and validation of otolith morphometrics as predictors of age in the forkbeard, Phycis phycis (Gadidae)

Population pattern and dynamics of the Bluemouth Helicolenus dactylopterus (Delaroche, 1809) in the eastern Mediterranean Sea

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