The reproduction of the Splash Tetra (Copella arnoldi), which inhabits the Amazon freshwater river basin, has its peculiarities. These fish deposit their eggs on the bottom of leaf blades above the water surface, where atmospheric moisture is high. After spawning is over the males remain beneath the leaf and spray the fertilized eggs with water so that they do not dry out. But that is the end of their care for their offspring. The hatching fry falls from the leaf back into the water and begin their independent life. These fish usually start mass spawning during the rainy season. Fish breeders are well aware of this fact and often deliberately arrange similar conditions for their fish when breeding them in captivity. and Jaroslav Eliáš.
The life cycle of the swim bladder nematode Huffmanela huffmani Moravec, 1987 (Trichinelloidea: Trichosomoididae), an endemic parasite of centrarchid fishes in the upper spring run of the San Marcos River in Hays County, Texas, USA, was experimentally completed. The amphipods Hyalella cf. azteca (Saussure), Hyalella sp. and Gammarus sp. were successfully infected with larvated eggs of Huffmanela huffmani. After ingestion of eggs of H. huffmani by experimental amphipods, the first-stage larvae hatch from their eggshells and penetrate through the digestive tract to the hemocoel of the amphipod. Within about 5 days in the hemocoel of the experimental amphipods at 22 °C, the larvae presumably attained the second larval stage and were infective for the experimental centrarchid definitive hosts, Lepomis spp. The minimum incubation period before adult nematodes began laying eggs in the swim bladders of the definitive hosts was found to be about 7.5 months at 22 °C. This is the first experimentally completed life cycle within the Huffmanelinae., McLean L. D. Worsham, David G. Huffman, František Moravec, J. Randy Gibson., and Obsahuje bibliografii
In the present study two new species of Tetragonocephalum Shipley et Hornell, 1905, T. mackenziei sp. n. and T. kazemii sp. n., are described from the spiral intestine of the cowtail stingray, Pastinachus sephen (Forsskål), from the northern coast of the Gulf of Oman. Tetragonocephalum mackenziei is distinguished from the 16 other valid species of Tetragonocephalum by a unique combination of characteristics, i.e. sperm-filled seminal receptacle in immature proglottids, body length (7.7-17.5 mm), body width (213-288 µm), number of proglottids (34-49), number of testes (10-14), size of scolex (228-315 µm × 213-288 µm) and size of acetabula (56-73 µm × 61-75 µm). Tetragonocephalum kazemii is morphologically distinguishable from its valid congeners and T. mackenziei based on a combination of characteristics, including body length (28.8-36.6 mm), number of proglottids (50-65), number of testes (30-42), size of scolex (388-564 µm × 326-448 µm), size of acetabula (62-86 µm × 57-90 µm) and testes (25-39 × 21-32). This brings the total number of validly described species of Tetragonocephalum to 18 and expands our knowledge of this diverse genus to now include the Gulf of Oman, as well as Arafura Sea, northern Indian Ocean and western Pacific Ocean., Atabak Roohi Aminjan, Masoumeh Malek., and Obsahuje bibliografii
V článku je popsán původ, domestikace a současný význam kapra obecného (Cyprinus carpio) jako nejdůležitějšího druhu rybničních chovů v Evropě. Stručně je vysvětlena technologie chovu kapra a její vlivy na ekosystémy rybníků., The origin, domestication process and present value of Common Carp (Cyprinus carpio) as the most important species in pond aquaculture in Europe is described. The technology of carp production and the impact of carp culture on the ecosystems of fishponds are briefly explained., Josef Matěna, Martin Flajšhans., and Obsahuj seznam literatury
Článek shrnuje nejzajímavější nálezy rybí fauny z paleogenních sedimentů moravské části flyšových Karpat. Je i malou exkurzí do historie výzkumů, která spadá už do poloviny 19. století. Představuje vývoj rybí fauny (žraloci a kostnaté ryby) v rámci menilitového a ždánicko-hustopečského souvrství a její význam z hlediska paleogeografie Západních Karpat., This article summarizes the most interesting records of fish fauna from Palaeogene flysch sediments in the Moravian part of the Carpathians. It is also a small excursion into the history of research dating back to the mid-19th century. I present the evolution of fish fauna (sharks and bony fish) within Menilitic and Ždánice-Hustopeče formations and its importance in the palaeogeography of the Western Carpathians., Růžena Gregorová., and Obsahuje seznam literatury