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1

Nematodes found in the European anchovy (Engraulis encrasicolus), a rare visitor to the Baltic Sea

100%
Kulikowski M., Rolbiecki L., Skora K., Rokicki J.
Oceanological and Hydrobiological Studies
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2012
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tom 41
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nr 3
2
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Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of Northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat

100%
Abdelouahab H., Berraho A., Baibai T., Larissi J., Charib S., Agouzouk A., Makaoui A., Ettahiri O., Errhif A.
Oceanologia
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2021
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tom 63
|
nr 1
3

Helminth parasites of the Atlantic chub mackerel, Scomber colias Gmelin, 1789 from Canary Islands, Central North Atlantic, with comments on their relations with other Atlantic regions

80%
Costa G., Cavallero S., D’Amelio S., Paggi L., Santamaria M. T. G., Perera C. B., Santos M. J., Khadem M.
Acta Parasitologica
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2011
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tom 56
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nr 1
Eleven parasite taxa were found infecting 68 Atlantic chub mackerel, Scomber colias Gmelin, 1789 from the Canary Islands, Central North Atlantic. The most abundant parasites were the gill monogenean Pseudokuhnia minor (P = 54.4%), larval anisakid nematodes (P = 11.8%) in the body cavity, a larval tetraphyllidean infecting bile ducts (P = 8.8%) and didymozoid digeneans infecting the gills (P = 7.4%). No correlation between fish length and abundance of infection with these parasites was found. Within the Atlantic, the comparison of present results with previous reports on the occurrence of parasites in this fish host, might suggest that there is more than one population unit of Atlantic chub mackerel in the Eastern Atlantic.
4

The variability of distribution and density of pelagic fishes in the Roznowski Dam Reservoir

80%
Swierzowski A.
Archives of Polish Fisheries
|
2003
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tom 11
|
nr 2
The distribution, density, species and size structures of the fish in the waters of the Rożnowski Dam Reservoir (area - 1100 ha; average depth - 12 m) were studied and their numbers and biomass were estimated. Hydroacoustic methods were applied and supplemented and verified with the results of control fishing. A SIMRAD EY-500 (split beam) 120 kHz, 7x7 deg echosounder was used. Maps of the spatial distribution and density of fish were prepared and the number of fish were determined in various areas and at various depths. The data indicate that there were significant differences in the number of fish in particular areas and at various times of day or night. At night fish density was over 6.3 times higher in the near-surface water layer in the backwater area than near the dam. The average fish density was 5.8 times lower during the day than at night; this is attributable to diurnal feeding and predator-avoidance migrations. The analyses of the nighttime acoustic data reveal that there are 13.5 million fish specimens in the pelagic zone of the Rożnowski Dam Reservoir. The total fish biomass was estimated based on the average unit weight of the fish caught (81.5 g) and was 1102.4 tons, or 1234.3 kg ha⁻¹. This is 30-times greater per hectare than the estimates for the Solina and Klimkówka reservoirs. Two cyprinid fishes, bleak and roach, constitute 85.8% of the number of fish and 66.3% of the biomass - for a total of 818.1 kg ha⁻¹ in the Rożnowski Dam Reservoir. Stocking only predatory fish (pike, pikeperch, wells) in this reservoir must be supported. It is recommended that net catches be intensified in the backwater area, especially those of bleak.
5

The tetraphyllidean cercoids from teleosts occurring in the Weddel Sea [Antarctic]

70%
Rocka A.
Acta Parasitologica
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1999
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tom 44
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nr 2
In total, 400 teleosts of 32 species (7 families) were examined. Cercoids of Tetraphyllidea (about 41 thousands) occurred in 204 host specimens of 26 species. Three morphological forms of cercoids were recognized. They were cercoids with bothridia divided into two and three loculi, and cercoids with subcylindrical bothridia. All forms were found in fishes from the Weddell Sea for the first time. Cercoids with bilocular bothridia were the most abundant form (90.7% of all specimens); cercoids with trilocular bothridia and cercoids with subcylindrical bothridia were less numerous (6.6 and 2.7% of all specimens, respectively). Cercoids concentrated in obligatory or facultative predators, whereas pelagic and bentho-pelagic fishes feeding on crill, were rarely infected. Chionodraco hamatus was the most heavily infected - prevalence 100%, relative density 903.
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