scholarly journals Sources of otolith morphology variation at the intra-population of two species of sparidae (Pagellus erythrinus and Diplodus vulgaris) collected from the island of Kerkennah (Tunisia)

2018 ◽  
Vol 5 ◽  
Author(s):  
Marwa Mejri ◽  
Imen Jmil ◽  
Jean-Pierre QUIGNARD ◽  
Monia Trabelsi
Keyword(s):  
Pagellus Erythrinus ◽  
Otolith Morphology

scholarly journals Antibiotic resistance of bacteria isolated from Pagellus erythrinus microplastics and public health

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
P Laganà ◽  
E Fazio ◽  
N Spanò ◽  
M Bonsignore
Keyword(s):  
Antibiotic Resistance ◽  
Petri Dish ◽  
Anthropogenic Pollution ◽  
Normal Structure ◽  
Multidrug Resistant ◽  
Morphological Properties ◽  
Marine Environments ◽  
Pagellus Erythrinus ◽  
Human Therapy ◽  
The Moment

Abstract Microplastics (MPs) are widespread in the aquatic environmental due to anthropogenic pollution and are ingested indifferently by fishes that confuse them with food. In aquatic environment, mechanical stress, UV radiations, chemical and biological actions cause a constant degradation and breakdown of plastic objects into smaller fragments. Mediterranean Sea is characterized by the highest densities of plastics in the world being a closed basin with a complex hydrodynamics. The aim of this work is to evidence the occurrence of microbial adhesions on MPs found in edible Pagellus erythrinus (Linnaeus, 1758) bought in local Sicilian supermarkets and therefore highlight the potential role of microplastics in conveying antibiotic resistance by ingestion of food by humans. The composition and structural-morphological properties of MPs found in the excised gastrointestinal tract (GIT) and gills are identified using different techniques. In particular, microparticles of different nature (plastics, organic components, cellulose-based materials) have been determined following specific Raman signals on a large spectral range (300-3500 cm-1). The Pagellus was dissected, open longitudinally, within a sterile glass Petri dish. The components deemed exogenous to the normal structure of the gills and GIT were collected. Optical microscopy images showed that both the GIT and the gill of Pagellus erythrinus contain MPs of different colors (black, dark blu) and mainly with a fibrous shape. At the moment, microbial assays show the adhesion of Citrobacter and E. coli in some fibers extracted by gills while Vibrio spp was mainly detected in the fibers present in GIT. Bacterial isolates were screened for susceptibility to antibiotics using the Kirby-Bauer test, choosing the molecules most used in human therapy. The results obtained suggest that plastics may contribute to the spread of multiple antibiotic resistance in marine environments underline the relevance of future studies on this topic. Key messages Plastics can serve as vectors for the spread of multiple resistances to antibiotics across marine environments. Further studies on possible vehicles of multidrug-resistant germs carried by food of various kinds are desirable.

Effects of extreme habitat conditions on otolith morphology – a case study on extremophile livebearing fishes (Poecilia mexicana, P. sulphuraria)

Zoology ◽  
2011 ◽  
Vol 114 (6) ◽  
pp. 321-334 ◽  
Author(s):  
Tanja Schulz-Mirbach ◽  
Rüdiger Riesch ◽  
Francisco J. García de León ◽  
Martin Plath
Keyword(s):  
Habitat Conditions ◽  
Poecilia Mexicana ◽  
Otolith Morphology ◽  
Extreme Habitat

Age, growth and bathymetric distribution of red pandora (Pagellus erythrinus) on the Cretan shelf (eastern Mediterranean)

2002 ◽  
Vol 82 (1) ◽  
pp. 149-160 ◽  
Author(s):  
Stylianos Somarakis ◽  
Athanassios Machias
Keyword(s):  
Eastern Mediterranean ◽  
Negative Relationship ◽  
Biological Data ◽  
Growth Data ◽  
High Concentration ◽  
Bathymetric Distribution ◽  
Double Logarithmic Plot ◽  
Data Set ◽  
Pagellus Erythrinus ◽  
The Mediterranean

Data from bottom trawl surveys conducted each summer, winter and spring on the Cretan shelf from 1988 to 1991, were used to study the age, growth, maturity and bathymetric distribution of red pandora (Pagellus erythrinus). The good agreement of back-calculated and observed lengths-at-age with length frequencies and the marginal increment analysis, supported the annual nature of scale marks. A comparison of available growth data from the Mediterranean and the Atlantic revealed higher lengths-at-age for red pandora in the north-western Mediterranean and the Atlantic than in the central and eastern Mediterranean. The auximetric analysis, i.e. the double logarithmic plot of the parameter K of the von Bertalanffy growth function vs asymptotic length (L∞), showed a strong negative relationship for the central and eastern Mediterranean data set, implying a common ‘growth space’ for the populations in these areas. Lengths-at-maturity were lower on the Cretan shelf than in the Atlantic. These differences were attributed to the synergistic combination of trophic and thermal conditions.  Depth, temperature and salinity data were combined with biological data on abundance, fish size, age and maturity. In general, mean size increased with bottom depth because smaller individuals tended to be found in shallower and warmer waters. Individuals having reached first maturity were mainly distributed in the periphery of the algal/angiosperm meadows (60–80 m). All detailed studies of the bathymetric distribution and movements of shelf-dwelling demersal species (Mullus barbatus, Mullus surmuletus, Lepidotrigla cavillone and Pagellus erythrinus) in the Mediterranean show that these species are characterized by a spring–summer spawning season, a high concentration of spawning adults at mid-shelf depths, and nursery grounds located in the vegetated shallows. This multispecies pattern might have an adaptive function with both ecological and management implications.

scholarly journals Brood stock formation of the hermaphrodite finfish species Pagellus erythrinus (common Pandora) from fish reared in captivity

2004 ◽  
Vol 5 (1) ◽  
pp. 187 ◽  
Author(s):  
S.D. KLAOUDATOS ◽  
D.S. KLAOUDATOS
Keyword(s):  
Hormonal Treatment ◽  
Sex Reversal ◽  
Reproductive Period ◽  
Brood Stock ◽  
Pagellus Erythrinus ◽  
Short Period ◽  
Significant Difference ◽  
In Captivity ◽  
Fish Group ◽  
Common Pandora

Formation of brood stock is considered to be one of the most important operations in order to acquire eggs and fry from any promising candidate finfish species for aquaculture production. The sex reversal observed in hermaphrodite species adds to confusion and creates additional complications in forming a brood stock. The present study describes the efforts and the results of the brood stock formation of the hermaphrodite finfish species Pagellus erythrinus (common Pandora) from individuals aged between 4 and 5 years (TL>300mm) reared in floating cages. Six groups were formed (50 fish/group) in all of which females were present comprising 20 to 40% of the population. The presence of females was in contrast to the literature, which reported that sex reversal of the common Pandora is complete in naturally occurring populations with the absence of females in sizes of a total length greater than 220mm, indicating that in captivity sex reversal is not complete for this species. Four of the groups formed spawned under natural environmental conditions without hormonal treatment and the other two groups were administered a different dosage (250 and 500 IU/kg) of Human Chorionic Gonadotropin (HCG) to induce spawning. The reproductive period started in the middle of May and ended at the beginning of July and spontaneous spawning occurred in all groups. Egg release lasted for a mean period of one month for the groups that spawned without hormonal treatment with no significant difference in the number of viable eggs between groups. The groups that spawned under hormonal treatment released eggs for a period of six and seven days, for the group that spawned under the high and low hormonal treatment, respectively, with no significant difference in the number of viable eggs between them. The hormonal induced spawning resulted in egg release within a short period of time ideal for a hatchery. However, the number of viable eggs produced was significantly lower compared to the number of viable eggs produced from groups that spawned without hormonal treatment.

scholarly journals First description of the male of Philometra filiformis (Nematoda: Philometridae), a gonad-infecting parasite of the marine fish Pagellus erythrinus (Sparidae) in Mediterranean

2009 ◽  
Vol 56 (4) ◽  
pp. 317-318 ◽  
Author(s):  
Gabriella Gaglio ◽  
Salvatore Giannetto ◽  
Antonio Panebianco ◽  
Frantisek Moravec
Keyword(s):  
Marine Fish ◽  
Pagellus Erythrinus

Revision of Hastatobythites and Saccogaster (Teleostei, Bythitidae) with three new species and a new genus

Zootaxa ◽  
2012 ◽  
Vol 3579 (1) ◽  
pp. 1 ◽  
Author(s):  
JØRGEN G. NIELSEN ◽  
WERNER SCHWARZHANS ◽  
DANIEL M. COHEN
Keyword(s):  
New Genus ◽  
Gill Rakers ◽  
Gill Opening ◽  
Frontal Plate ◽  
Fin Ray ◽  
Otolith Morphology ◽  
Gill Filaments ◽  
Three New Species ◽  
Head Pores ◽  
Infor Mation

Material of three similar and probably related genera of the viviparous ophidiiform family, Bythitidae, has been studied.The monotypic Hastatobythites is only known from the original two specimens; re-examination of the paratype and infor-mation of the holotype clearly demonstrates the validity of the genus. The revision of Saccogaster (Cohen & Nielsen1972) was based on 15 specimens. Since then 29 additional specimens have been collected representing 11 species, threeof which are here described: S. brayae, horrida and nikoliviae. Three of the 11 Saccogaster species, S. melanomycter, S.normae and S. rhamphidognatha, differ so much from the remaining eight that a new genus, Parasaccogaster, is de-scribed. The main diagnostic characters used for the three genera are: A pair of spines on frontal plate behind eyes, spineson snout, length of gill filaments on anterior arch, number and length of developed gill rakers, size of gill opening, thick-ness of skin, head pores, otolith morphology, color marks on head, neuromasts on head and head morphometrics, fin ray counts.

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