Sezonska pojava i histopatologija parazita Trichodina puytoraci Lom, 1962 na ciplu glavašu (Mugil cephalus) iz Tunisa

During a parasitological survey in Ghar El Melh Lagoon in Tunisia, 108 flathead mullet (Mugil cephalus L., 1758) were investigated for protozoan ectoparasites. Trichodina puytoraci Lom, 1962 infecting the gills of the examined fish were isolated and reported for the first time from this locality. The overall infestation prevalence and mean intensity level were 22.42 % and 70 ± 8.1 trichodinids per fish, respectively. The highest prevalence was observed in spring. The relationship between host’s size and parasite prevalence was significant. The histopathological study revealed that M. cephalus heavily infested by T. puytoraci exhibited serious lesions such as hyperplasia of the epithelial cells, fusion and necrosis of secondary lamellae.Tijekom parazitološkog pregleda 108 primjeraka cipla glavaša (Mugil cephalus L., 1758) u Ghar El Melh Laguna u Tunisu, istraživani su ektoparaziti iz grupe protozoa. Škrge pregledanih riba bile su zaražene s parazitom Trichodina puytoraci Lom, 1962 koji je izoliran i utvrđen po prvi put za ovaj lokalitet. Ustanovljena je ukupna prevalencija zaraze (22,42%) i srednja razina intenziteta (70 ± 8,1) trichodinida po primjerku. Najveća prevalencija uočena je u proljeće. Odnos između veličine domaćina i rasprostranjenosti nametnika je bio značajan. Histopatološka studija otkrila je da je cipal glavaš, M. cephalus, teško zaražen parazitom T. puytoraci, izložen ozbiljnim promjenama kao što su hiperplazija epitelnih stanica te spajanje i nekroza sekundarnih lamela

Biología reproductiva de Diplodus sargus sargus en el golfo de Túnez (Mediterráneo)

The sexual activity of Diplodus sargus sargus in the Gulf of Tunis takes place from January to May. Spawning occurs in spring (March to May), as the water temperature rises from 15 to 18°C, just after the winter minimum. The spawning period increases as the latitude decreases. The overall male to female ratio was statistically different from unity. Size at sexual maturity (TL50) was 21 cm (4 years old). The length-weight relationship for all individuals was described by the following parameters: a = 0.015 and b = 3.051. D. s. sargus from the Gulf of Tunis is a rudimentary hermaphrodite with partial protandry.La actividad sexual de Diplodus sargus sargus del golfo de Túnez tiene lugar de enero a mayo. La puesta tiene lugar en primavera (marzo a mayo), cuando la temperatura del agua sube de 15 a 18°C, justo tras el mínimo invernal. A medida que la latitud decrece se observa un periodo reproductivo progresivamente más extenso. La relación machos/hembras fue significativamente distinta de uno. La talla de madurez sexual (TL50) fue 21 cm (4 años). La relación talla-peso para todos los individuos se describió por los siguientes parámetros: a = 0.015 y b = 3.051. D. s. sargus del golfo de Túnez es un a hermafrodita rudimentario con proterandría parcial.

Edad y crecimiento de Spondyliosoma cantharus (Sparidae) en el Golfo de Túnez

Age and the growth of the black seabream Spondyliosoma cantharus (Linnaeus, 1758) from the Gulf of Tunis were investigated using scales and otoliths. The length-weight relationship showed that the growth rates were isometric for females whereas males and the whole sample present a positive allometry. The monthly evolution in marginal increment data of scales and otoliths revealed that only one annulus is formed per year in April. Fish length and radii of the scales or otoliths were closely correlated. The von Bertalanffy growth equation was fitted on mean back-calculated length-at-age data, resulting in the parameter values L∞=35.4 cm, k=0.15 y–1 and t0=–0.19 y for scales and L∞=38.6 cm, k=0.10 y–1 and t0=–0.14 y for otoliths. Parameters estimated from scale and otoliths were significantly similar. However, taking into consideration the lower standard deviations of means for estimates based on otolith readings and the higher variance explained by the regression line fitted to otoliths, the latter seem to be more appropriate for ageing S. cantharus. The maximum age of the black seabream of the Gulf of Tunis is 10 years. Large discrepancies in growth parameters between geographic areas are the result of different growth patterns.Se han investigado la edad y el crecimiento de la cántara Spondyliosoma cantharus (Linnaeus, 1758) del Golfo de Túnez a partir de la lectura de las escamas y los otolitos. La relación talla-peso revela que las tasas de crecimiento son isométricas en las hembras, mientras que los machos y en toda la muestra existe una alometría positiva. La evolución mensual de los incrementos marginales de las escamas y los otolitos muestra que se forma un solo anillo anual en abril. La correlación entre la longitud de los peces y el radio de las escamas o los otolitos es muy elevada. La ecuación de crecimiento de von Bertalanffy se ha ajustado a la media talla-edad retrocalculada resultando en los siguientes valores para los parámetros de las escamas (L∞=35.4 cm, k=0.15 año–1, t0=–0.19 año) y los otolitos (L∞=38.6 cm, k=0.10 año–1, t0=–0.14 año). Los parámetros estimados a partir de las escamas y los otolitos resultaron significativamente similares. Sin embargo, teniendo en cuenta que las desviaciones estándar de las medias en las estimas son más bajas, y que la varianza explicada es mayor en la regresión ajustada a los otolitos, la lectura de los otolitos parece ser la más apropiada para datar la edad de S. cantharus. La edad máxima de la cántara del Golfo de Túnez es de 10 años. Las grandes diferencias en los parámetros de crecimiento entre áreas geográficas se deben a diferentes pautas de crecimiento

Unpublished Mediterranean records of marine alien and cryptogenic species

Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, buried in scattered repositories or in the personal databases of experts. Through an initiative to collect, harmonize and make such unpublished data for marine alien and cryptogenic species in the Mediterranean Sea available, a large dataset comprising 5376 records was created. It includes records of 239 alien or cryptogenic taxa (192 Animalia, 24 Plantae, 23 Chromista) from 19 countries surrounding the Mediterranean Sea. In terms of records, the most reported Phyla in descending order were Chordata, Mollusca, Chlorophyta, Arthropoda, and Rhodophyta. The most recorded species was Caulerpa cylindracea, followed by Siganus luridus, Magallana sp. (cf. gigas or angulata) and Pterois miles. The dataset includes records from 1972 to 2020, with the highest number of records observed in 2018. Among the records of the dataset, Dictyota acutiloba is a first record for the Mediterranean Sea. Nine first country records are also included: the alga Caulerpa taxifolia var. distichophylla, the cube boxfish Ostracion cubicus, and the cleaner shrimp Urocaridella pulchella from Israel; the sponge Paraleucilla magna from Libya and Slovenia; the lumpfish Cyclopterus lumpus from Cyprus; the bryozoan Celleporaria vermiformis and the polychaetes Prionospio depauperata and Notomastus aberans from Malta

Sezonska pojava i histopatologija parazita Trichodina puytoraci Lom, 1962 na ciplu glavašu (Mugil cephalus) iz Tunisa

During a parasitological survey in Ghar El Melh Lagoon in Tunisia, 108 flathead mullet (Mugil cephalus L., 1758) were investigated for protozoan ectoparasites. Trichodina puytoraci Lom, 1962 infecting the gills of the examined fish were isolated and reported for the first time from this locality. The overall infestation prevalence and mean intensity level were 22.42 % and 70 ± 8.1 trichodinids per fish, respectively. The highest prevalence was observed in spring. The relationship between host’s size and parasite prevalence was significant. The histopathological study revealed that M. cephalus heavily infested by T. puytoraci exhibited serious lesions such as hyperplasia of the epithelial cells, fusion and necrosis of secondary lamellae.Tijekom parazitološkog pregleda 108 primjeraka cipla glavaša (Mugil cephalus L., 1758) u Ghar El Melh Laguna u Tunisu, istraživani su ektoparaziti iz grupe protozoa. Škrge pregledanih riba bile su zaražene s parazitom Trichodina puytoraci Lom, 1962 koji je izoliran i utvrđen po prvi put za ovaj lokalitet. Ustanovljena je ukupna prevalencija zaraze (22,42%) i srednja razina intenziteta (70 ± 8,1) trichodinida po primjerku. Najveća prevalencija uočena je u proljeće. Odnos između veličine domaćina i rasprostranjenosti nametnika je bio značajan. Histopatološka studija otkrila je da je cipal glavaš, M. cephalus, teško zaražen parazitom T. puytoraci, izložen ozbiljnim promjenama kao što su hiperplazija epitelnih stanica te spajanje i nekroza sekundarnih lamela

Parazitofauna nekih vrsta cipala i listova u tuniskim lagunama

A parasitological survey of important commercial fish from northern Tunisian lagoons was conducted from May 2009 to April 2010. A total of 771 fish belonging to six species: Flathead mullet (Mugil cephalus Linnaeus, 1758); Golden mullet (Liza aurata Risso, 1810); Leaping mullet (Liza saliens Risso, 1810) (Mugilidae); Common sole (Solea solea Quesnel, 1806); Egyptian sole (Solea aegyptiaca Chabanaud, 1927) and Senegalese sole (Solea senegalensis Kaup, 1958) (Soleidae) were examined. The total of 11 parasite species representing 7 genera (from four different phyla) was recorded: Myxobolus Bütschli, 1882; Sphearospora Thélohan, 1892; Zschokkella Auerbach, 1910; Ceratomyxa Théloan, 1892 (Myxozoa); Trichodina Ehrenberg, 1838 (Ciliophora); Amyloodinium Brown & Hovasse, 1946 (Sarcomastigophora) and Solostamenides Unnithan, 1971 (Platyhelminthes). Morphology, site of infection and prevalence of the parasites found during the survey are described.Obavljen je parazitološki pregled važnih komercijalnih riba iz laguna sjevernog Tunisa. Istraživanje je trajalo od svibnja 2009. do travnja 2010. godine. Ulovljeno je ukupno 77 jedinki riba koje spadaju u šest istraživanih vrsta: cipal bataš (Mugil cephalus Linnaeus, 1758); cipal zlatar (Liza aurata Risso, 1810); cipal dugaš (Liza saliens Risso, 1810) (Mugilidae); list (Solea solea Quesnel, 1806); egipatski list (Solea aegyptiaca Chabanaud, 1927) i senegalski list (Solea senegalensis Kaup, 1958) (Soleidae). Zabilježeno je ukupno 11 vrsta parazita iz 7 rodova (iz četiri različita koljena): Myxobolus Bütschli, 1882; Sphearospora Thélohan, 1892; Zschokkella Auerbach, 1910; Ceratomyxa Théloan, 1892 (Myxozoa); Trichodina Ehrenberg, 1838 (Ciliophora); Amyloodinium Brown & Hovasse, 1946 (Sarcomastigophora) i Solostamenides Unnithan, 1971 (Platyhelminthes). Tijekom znanstvenog istraživanja proučavani su: morfologija, mjesto infekcije i učestalost parazita

Unpublished Mediterranean records of marine alien and cryptogenic species

Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, buried in scattered repositories or in the personal databases of experts. Through an initiative to collect, harmonize and make such unpublished data for marine alien and cryptogenic species in the Mediterranean Sea available, a large dataset comprising 5376 records was created. It includes records of 239 alien or cryptogenic taxa (192 Animalia, 24 Plantae, 23 Chromista) from 19 countries surrounding the Mediterranean Sea. In terms of records, the most reported Phyla in descending order were Chordata, Mollusca, Chlorophyta, Arthropoda, and Rhodophyta. The most recorded species was Caulerpa cylindracea, followed by Siganus luridus, Magallana sp. (cf. gigas or angulata) and Pterois miles. The dataset includes records from 1972 to 2020, with the highest number of records observed in 2018. Among the records of the dataset, Dictyota acutiloba is a first record for the Mediterranean Sea. Nine first country records are also included: the alga Caulerpa taxifolia var. distichophylla, the cube boxfish Ostracion cubicus, and the cleaner shrimp Urocaridella pulchella from Israel; the sponge Paraleucilla magna from Libya and Slovenia; the lumpfish Cyclopterus lumpus from Cyprus; the bryozoan Celleporaria vermiformis and the polychaetes Prionospio depauperata and Notomastus aberans from Malta.JRC.D.2-Water and Marine Resource