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The use of decapsulated Artemia cysts as food for ide, Leuciscus idus (L.), larviculture was investigated. Three days after hatching, the larvae were fed on different diets: (a) dried decapsulated Artemia cysts, (b) Artemia nauplii, (c) Artemia nauplii for 7 days and then trout starter, (d) diet for marine larvae (manufactured artificial diet), (e) trout starter. After a 21-day rearing period, the highest survival rate was obtained with the larvae receiving decapsulated Artemia cysts. Feeding of the larvae with artificial diets resulted in a significantly lower survival rate compared to the other groups. At the end of the experiment, the larvae fed on Artemia nauplii gained significantly higher length compared to the other groups. Feeding different artificial diets resulted in significantly lower average mean length and weight compared to the other groups.
The aim of the experiment was to evaluate the growth and survival of larval Atlantic sturgeon fed microworms (Panagrellus sp.) and brine shrimp nauplii (Artemia sp.). The experiment was conducted at the Department of Sturgeon Breeding in Pieczarki of the Inland Fisheries Institute in Olsztyn. The experimental material comprised larval Atlantic sturgeon 22 days post hatch that were already feeding. The fish were stocked into nine tanks with a volume of 40 l each that were included in a recirculation system. The fish were divided into three experimental groups: group A was fed brine shrimp nauplii; group A+N was fed brine shrimp nauplii and microworms; group N was fed microworms. The fish from the group fed only brine shrimp nauplii attained the greatest body growth (0.068 g) and the highest survival (43.3%). Fish from group A+N, which received mixed feed, attained similar results for both growth and survival to that in group A (0.061 g and 33%). Differences between these two groups were not statistically significant (P > 0.05). The weakest results were obtained for the group fed only microworms. The fish from this group had a final body weight of 0.045 g and survival of 1.7%. The differences in these parameters among the groups were statistically significant (P < 0.05). The current experiment permits concluding that, at the moment, feeding microworms exclusively does not produce the anticipated results. Brine shrimp nauplii was a substantially better feed choice for larval Atlantic sturgeon. However, in both instances, further experiments must be performed before the precise daily ration or the manner in which the ration is divided over the day is determined. This information could improve the results of rearing substantially.
Cysticercoids of two cestode species isolated from brine shrimps from the Mediterranean coasts of Spain and France are described. Fimbriarioides tadornae Maksimova, 1976 (adults known as parasites of Tadorna tadorna) was recorded from Artemia parthenogenetica and A. franciscana from Spain (Bras del Port and River Ebro Delta, respectively), and from A. franciscana from Aigues-Mortes, France (new geographical record). Branchiopodataenia gvozdevi (Maksimova, 1988) (adults known as parasites of Larus genei) was recorded from A. parthenogenetica (Bras del Port, Spain), A. salina (San Pedro del Pinatar, Spain) and A. franciscana (River Ebro Delta, Spain); this is the first record of the species in Europe. An illustrated key to cysticercoids of 12 cestode species from Artemia spp. from the Western Mediterranean is proposed.
The lacustrine ecosystems located in the Andes Mountains in the Atacama desert and in the Chilean Southern Patagonia are characterized by their high levels of salinity, the zooplankton in these sites are characterized by a marked predominance of calanoid copepods at low or intermediate salinity levels, and at high salinity levels pratically only the genus Artemia is dominant. Data on levels of salinity and zooplanktonic composition in both regions were collected in field work and from published data. Statistical analysis showed a marked inverse association between salinity and species richness that was notoriously significant for Andes Mountains (R = -0.8193; p = 0.0037), whereas for Southern Patagonia there were observed weakly similar results, caused by lack of data between 5.0-15.0 g/l. Both zones observed calanoid dominance at low and moderate salinity levels between 3-51 g/l and 1-16 g/l for Andes Mountains and Southern Patagonia, respectively, and Artemia genus was dominant at salinities above 100 g/l for Andes Mountains and 20 g/l for Southern Patagonia. Ecological and biogeographic effects, and comparison with zooplankton assemblages of Australian saline lakes are discussed in the present study.
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