scholarly journals Aspects of Reproductive Biology of the European Hake (Merluccius merluccius) in the Northern and Central Adriatic Sea (GSA 17-Central Mediterranean Sea)

2021 ◽  
Vol 9 (4) ◽  
pp. 389
Author(s):  
Michela Candelma ◽  
Luca Marisaldi ◽  
Daniela Bertotto ◽  
Giuseppe Radaelli ◽  
Giorgia Gioacchini ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Adriatic Sea ◽  
Central Mediterranean ◽  
Merluccius Merluccius ◽  
Biometric Analysis ◽  
Relative Fecundity ◽  
First Maturity ◽  
First Time ◽  
North Adriatic Sea ◽  
European Hake

The study focused on the macroscopic, histological, and biometric analysis of European hake females in GSA 17 (Central-North Adriatic Sea). From 2013 to 2015, 976 females were collected and analyzed monthly. Though females in spawning conditions were found during the whole year, the trend of GSI showed a peak of the reproductive season from April to July in 2014 and 2015. HSI and Kn reached the highest values in September, after the spawning peaks. In 2013, the trend of these indices did not highlight an evident peak, probably due to an adverse event that occurred in the previous winter in the Adriatic shelf. The length at first maturity (L50) was estimated by macroscopic and histological approaches, resulting in 30.81 cm for the macroscopical length and 33.73 cm for the histological length; both values are higher than the current catching legal size. For the first time in this area, batch and relative fecundity were estimated. Relative fecundity was similar to the Mediterranean and the Atlantic stocks, whereas batch fecundity values were lower compared to other fishing grounds. Overall, the analysis of reproductive parameters plays a fundamental role in the sustainable management of this resource in an area as overfished as the Central-North Adriatic Sea.

scholarly journals Integrated response of antioxidant biomarkers in the liver and white muscle of European hake (Merluccius merluccius L.) females from the Adriatic sea with respect to environmental influences

2018 ◽  
Vol 70 (1) ◽  
pp. 205-214 ◽  
Author(s):  
Sladjan Pavlovic ◽  
Slavica Borkovic-Mitic ◽  
Tijana Radovanovic ◽  
Branka Gavrilovic ◽  
Svetlana Despotovic ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
White Muscle ◽  
Adriatic Sea ◽  
Principal Component ◽  
Seasonal Effects ◽  
Merluccius Merluccius ◽  
Biomarker Response ◽  
Antioxidant Defense Enzymes ◽  
Integrated Response ◽  
European Hake

We investigated the integrated response of antioxidant defense enzymes (total superoxide dismutase (TotSOD), manganese-containing superoxide dismutase (MnSOD), copper-zinc-containing superoxide dismutase (CuZnSOD), catalase (CAT), glutathione peroxidase (GSH-Px), glutathione reductase (GR) and phase II biotransformation enzyme, glutathione- S-transferase (GST)) in the liver and white muscle of females of European hake (Merluccius merluccius L.) from the Adriatic Sea (Montenegro) in winter and spring. The activity of GSH-Px in the liver was significantly increased, while GST activity was decreased in spring compared to the winter. In white muscle, the activities of TotSOD and CuZnSOD were increased, while the activities of MnSOD, CAT, GSH-Px, GR and GST were decreased in spring when compared to the matching values in winter. The activities of TotSOD and CuZnSOD in winter were markedly lower in the muscle than in the liver, while the activity of MnSOD in the muscle was higher when compared to the liver. Principal component analysis (PCA) revealed clear separation of the investigated antioxidant biomarkers between tissues and seasons, while the integrated biomarker response (IBR) showed that the most intensive antioxidant biomarker response was in the liver in spring. Star plots of IBR showed a dominant contribution of glutathione-dependent biomarkers (GSH-Px, GR and GST) and CAT in both tissues and seasons with respect to SOD isoenzymes. All enzyme activities (except MnSOD) were greater in the liver in comparison to the white muscle. Our results show that the liver possesses a greater capacity to establish and maintain homeostasis under changing environmental conditions in winter and spring. At the same time, seasonal effects are more pronounced in muscle tissue.

scholarly journals Age estimation, growth and maturity of the European hake (Merluccius merluccius (Linnaeus, 1758)) from Iberian Atlantic waters

2003 ◽  
Vol 60 (5) ◽  
pp. 1086-1102 ◽  
Author(s):  
C Piñeiro ◽  
M Saínza
Keyword(s):  
Life History ◽  
Age Estimation ◽  
Growth Parameters ◽  
Grey Literature ◽  
Von Bertalanffy ◽  
Merluccius Merluccius ◽  
Consistent Manner ◽  
The Mean ◽  
First Maturity ◽  
European Hake

Abstract Difficulties in age estimation for hake (Merluccius merluccius) have hampered the assessment of stocks. Here, we describe new, agreed ageing criteria based on the interpretation of the pattern of otolith growth. Improved estimates of von Bertalanffy growth parameters, and new estimates of maturity ogive parameters and length–weight relationships for European hake from Iberian Atlantic waters are presented. The results came from a study carried out during 1996–1997 and provide the first published account of the main life history traits of Southern stock hake. von Bertalanffy growth parameters of males were L∞ = 70cm, K = 0.18 year−1, and t0=−0.97 year, and those of females were L∞ = 89cm, K = 0.13 year−1, and t0 = −1.15 year. Growth of sexes differed from age 3 onwards, with females being on average larger and heavier than males. The estimated total length (L, cm)–total weight (W, g) relationships were W=0.0132135L2.8134246 for males and W=0.0086471L2.942563 for females. Spawning took place from December to May with a peak in February. The mean length and age at first maturity were 32.8 cm at 2.5 years for males and 45 cm at 4.4 years for females. Application of new ageing criteria showed that otolith sections may be used to determine ages up to 5 years in a consistent manner. These results indicate that hake of the Southern stock grow at higher rates and mature earlier than previously considered. Summaries of hake's life history parameters from other marine regions are also presented in order to make information that belongs largely to the grey literature available.

Prey preferences and ontogenetic diet shift of European hake Merluccius merluccius (Linnaeus, 1758) in the central Mediterranean Sea

2019 ◽  
Vol 25 ◽  
pp. 100440 ◽  
Author(s):  
Virginia Carrozzi ◽  
Manfredi Di Lorenzo ◽  
Daniela Massi ◽  
Antonino Titone ◽  
Giandomenico Ardizzone ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Diet Shift ◽  
Central Mediterranean ◽  
Merluccius Merluccius ◽  
Ontogenetic Diet Shift ◽  
Prey Preferences ◽  
Central Mediterranean Sea ◽  
European Hake

scholarly journals Twenty-five-year longevity of European hake (Merluccius merluccius) from novel use of bomb radiocarbon dating in the Mediterranean Sea

2016 ◽  
Vol 67 (7) ◽  
pp. 1077 ◽  
Author(s):  
Sergio Vitale ◽  
Allen H. Andrews ◽  
Pietro Rizzo ◽  
Salvatore Gancitano ◽  
Fabio Fiorentino
Keyword(s):  
Mediterranean Sea ◽  
14C Dating ◽  
Merluccius Merluccius ◽  
Total Length ◽  
Bomb Radiocarbon ◽  
The Mediterranean ◽  
First Time ◽  
Slow Growing ◽  
European Hake ◽  
Age Reading

The high variability of growth and longevity estimates for European hake (Merluccius merluccius) reflects the existence of two opposing hypotheses on growth rates that differ by a factor of 2: (1) a fast-growing hypothesis (FGH) with a maximum age near 15 years; and (2) a slow-growing hypothesis (SGH) with a maximum age near 30 years. A recently established regional radiocarbon (14C) reference led to a first-time application of bomb 14C dating in the Mediterranean Sea to three of the largest-sized and potentially oldest-catch female European hake. Because age reading of otoliths is very subjective and poorly defined, these fish were aged blind with bomb radiocarbon (14C) dating as an independent estimate of validated age. The validated ages were compared with the theoretical maximum ages from the most reliable FGH and SGH von Bertalanffy growth functions. Among the three bomb 14C ages, the most diagnostic length-at-age was an alignment with the bomb 14C rise period for two of the three fish, providing validated ages of 22 years (74.5-cm total length) and 25 years (88-cm total length). The results provide estimates of length-at-age that are in agreement with the SGH and cannot be accounted for by the FGH.

scholarly journals The spawning strategy of European hake (Merluccius merluccius, L. 1758) across the Western and Central Mediterranean Sea

2019 ◽  
Vol 219 ◽  
pp. 105333 ◽  
Author(s):  
Pierluigi Carbonara ◽  
Cristina Porcu ◽  
Marilena Donnaloia ◽  
Paola Pesci ◽  
Letizia Sion ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Central Mediterranean ◽  
Merluccius Merluccius ◽  
Central Mediterranean Sea ◽  
European Hake

First record of three Bivalvia species: Thyasira succisa, Lyonsia norwegica and Poromya granulata in the Adriatic Sea (Central Mediterranean)

2015 ◽  
Vol 8 ◽  
Author(s):  
Pierluigi Strafella ◽  
Luca Montagnini ◽  
Elisa Punzo ◽  
Angela Santelli ◽  
Clara Cuicchi ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
First Record ◽  
Depth Range ◽  
Central Mediterranean ◽  
First Time

Three species of bivalves,Thyasira succisa,Lyonsia norwegicaandPoromya granulate, were recorded for the first time in the Adriatic Sea during surveys conducted from 2010 to 2012 on offshore relict sand bottoms at a depth range of 45–80 m.

scholarly journals Biometric properties of the European hake, Merluccius merluccius (Osteichthyes: Merlucciidae), from the central Adriatic sea

2011 ◽  
Vol 63 (1) ◽  
pp. 259-267 ◽  
Author(s):  
M. Santic ◽  
Biljana Radja ◽  
Antonela Paladin ◽  
Ana Curic
Keyword(s):  
Adriatic Sea ◽  
Morphological Difference ◽  
The Body ◽  
Meristic Characters ◽  
Morphometric Measurements ◽  
Merluccius Merluccius ◽  
Body Depth ◽  
Males And Females ◽  
The Relationship ◽  
European Hake

The relationship between morphometric measurements (16) and meristic characters (6) was examined in 460 specimens of the European hake (225 females, 210 males and 25 immature ones) caught in the central Adriatic Sea. Morphological difference between males and females was not marked. Biometric analyses of the morphometric and meristic characteristics indicated a homogenous morphology stock of M. merluccius in the central Adriatic Sea. Changes in some morphometric characteristics obtained in conjunction with an increase in body length showed that smaller specimens have a longer head, anal and ventral fin than adult specimens. The negative correlation recorded for the maximum and minimum body depth indicated that the body becomes progressively elongated. The meristic characteristics of the European hake from different Mediterranean and NE Atlantic areas are mostly in agreement with the data in our study.

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