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At least 487 records · Page 27Linked to original sources
PubMed1976

Some histochemical reactions on the neurosecretory cells of Rivulogammarus syriacus chevreux (Crustacea, Amphipoda).

The histochemistry of neurosecretory material in neurosecretory cells of Rivulo-gammarus syriacus has been investigated. Histochemically, these cells contain different neurosecretory substances. The material in A and C cells consists of mucopolysaccharides and lipids, that in B, B' and D cells there are a protein containing cystine S-S group, mucopolysaccharides and lipids, and that in E cell contains a weak protein with cystine S-S group, a substance showing beta metachromasia and lipids. The lipids are found in all the cells.

Crustacea↗
PubMed2003

Hydrostatic pressure effects on vestibular hair cell afferents in fish and crustacea.

Following the discovery of a hydrostatic pressure sensor with no associated gas phase in the crab, and the knowledge that several systems of cells in culture show long term alterations to small changes in hydrostatic pressure, we show here that vestibular type II hair cells in a well known model system (the isolated elasmobranch labyrinth), are sensitive to hydrostatic pressure. This new finding for the vertebrate vestibular system may provide an explanation for low levels of resting activity in vertebrate hair cells and explain how fish without swim bladders sense hydrostatic cues. It could have implications for humans using their balancing systems in hypobaric or hyperbaric environments such as in aircraft or during space exploration. Although lacking the piston mechanism thought to operate in crab thread hairs which sense angular acceleration and hydrostatic pressure, the vertebrate system may use larger numbers of sensory cells with resultant improvement in signal to noise ratio. The main properties of the crab hydrostatic pressure sensing system are briefly reviewed and new experimental work on the isolated elasmobranch labyrinth is presented.

Action Potentials↗
PubMed2001

Abundance of Petrolisthes armatus (Crustacea: Porcellanidae) on a tropical estuarine intertidal rocky beach, Gulf of Nicoya estuary, Costa Rica.

Population of the porcellanid crab Petrolisthes armatus was studied on a rocky intertidal beach located at the Punta Morales peninsula in the mid upper Gulf of Nicoya estuary, Pacific coast of Costa Rica, from December 1997 to November 1998 (14 dates). Horizontal plankton tows (280 micron mesh net) were also made to verify the presence of P. armatus larvae. Crabs were collected every 3 m along three 18 m long transects, at two sites on the beach, by placing a bottomless bucket fringed with canvas to prevent the organisms from escaping under the rim. A total of 15,382 P. armatus were collected. Only 146 (0.95%) crabs had a carapace length longer than 10 mm, and 8995 (58.5%) were in the size range of 2 to 4.5 mm. The remaining crabs 6241 (40.5%) were in the size range of 4.6 to 10 mm. Male and female P. armatus were represented by 2777 and 3518 individuals respectively, with a sex ratio of 1:1.26. Ovigerous females were found at all dates and included 2937 individuals (83% of females). Plankton tows yielded only 73 larvae of P. armatus (Zoea 1), with a density of 1.2 larvae/m3. No statistically significant seasonal trends in the population of this species were detected. P. armatus appears to reproduce continuously the year around in Punta Morales, and some peaks of abundance were present during the dry and rainy seasons. These trends are similar to trends reported for other crustacean species in the Gulf of Nicoya.

Animals↗
PubMedDate not supplied

[The artificial infection of the cladoceran Moina macrocopa (Crustacea: Phyllopoda) with the microsporidia Gurleya sp. (Microsporidia: Gurleyidae)].

Microcrustaceans Moina macrocopa (Straus, 1820) have been collected in a small vernal pond and cultured under laboratory conditions. The infection of this culture with the microsporidia Gurleya sp. was detected and high virulence of this microsporidian species allowed us to carry out the transmission experiments. Horizontal transmission, the high host specificity and maximal spore production in the hypodermal and fat body cells through 5-6 days after per oral experimental infection have been revealed. Histological investigations demonstrated that Gurleya sp. reduces drastically host reproductive success without a considerable influence on the microcrustaceans' mortality.

Animals↗
PubMed1991

[Parasitic Crustacea of fishes from the north-east Atlantic Ocean].

Fish from the north-east Atlantic, including neighbouring aquens are host of 3 species of Branchiura, 163 Copepoda, 37 Isopoda, 2 Amphipoda, and 1 of parasitic Cirripedia. Chondrichthyes have more species of parasitic crustaceans than Osteichthyes. Many specific parasites of Osteichthyes and the facultative parasites of fish include species of crustaceans to fish of both classes. 165 species of parasitic crustaceans are found in benthic and near-benthic fish, and 55 in pelagic fish. The greatest variety of species parasitic crustaceans is found in fishes in the North Sea (139); it is much smaller in the Baltic Sea (15). Endemic species constitute 15% of the total number of parasitic crustacean. The irregular distribution of parasitic crustaceans is among others connected with the biology and ecology of both hosts and their parasites.

Animals↗
PubMed1991

The ecological-geographical characteristics of the parasitic crustacea of the Caspian Sea fishes.

In the Caspian Sea were found typically marine form--Pseudotracheliastes stellatus, specific for Acipenseridae, Thersitina gasterostei typical for sticklebacks rather euryhaline hosts, and Ergasilus briani, E. sieboldi, Paraergasilus rylowi, Lernaea elegans, L. esocina, Caligus lacustris, Argulus coregoni, A. foliaceus and Achtheres percarum normally infested the fishes in fresh water. The last one is characteristic for only Percidae, the remaining fresh-water crustaceans have far more wide host range. The majority of the parasitic crustaceans are noted in the coastal shallow areas of the Caspian Sea. Only P. stellatus is met too in the fairy deep places, where they are brought by Acipenseridae, which perform migrations of considerable extent.

Animals↗