Boleophthalmus

About: Boleophthalmus is a research topic. Over the lifetime, 41 publications have been published within this topic receiving 808 citations.

Mercuric Chloride Induced Inhibition of Acid and Alkaline Phosphatase Activity in the Kidney of Mudskipper, Boleophthalmus dentatus

Abstract: The present paper deals with the inhibition of the specific activity of the acid and alkaline phosphatases in the kidney tissue of mudskipper Boleophthalmus dentatus, exposed to different sublethal concentrations of mercuric chloride. There was a more or less linear inhibition of the specific activity of both the enzymes with increasing concentration of mercuric chloride as well as exposure time. The inhibition of acid phosphatase could be due to the rupture of lysosomal membrane in the presence of mercury compound, which acts as a labilizing agent. The inhibition of alkaline phosphatase probably caused a breakdown of the membrane transport system.

The natural history of mudskippers in northern Australia, with field identification characters

Abstract: We provide field identification characters and report on the natural history of mudskippers (Gobiidae: Oxudercinae) in Cairns, Darwin, Derby and Broome, northern Australia. Nine species in four genera are recorded (Boleophthalmus birdsongi, B. caeruleomaculatus, Periophthalmodon freycineti, Periophthalmus argentilineatus, P. darwini, P. minutus, P. novaeguineaensis, P. takita and Scartelaos histophorus). The intertidal zonation of mudskippers conforms to previously reported patterns, but subtle differences in habitat preference are observed at both intraspecific and intrageneric levels, underlining the need for in-depth investigation of habitat selection by mudskippers. Although most species inhabit littoral mudflats, some show possible habitat expansion: juvenile Periophthalmodon freycineti are found occasionally in pools on a sandy shore, and a population of Periophthalmus minutus is found to be established in a marginal mangrove habitat (a salt flat behind a pioneer mangrove assemblage). Burrow confinement during high tide is confirmed for both species of Boleophthalmus, two Periophthalmus (P. minutus and P. novaeguineaensis) and Scartelaos, but not for Periophthalmodon or the other Periophthalmus species. Territory formation is described for S. histophorus.

Differences in the responses of two mudskippers, Boleophthalmus boddaerti and Periophthalmus chrysospilos to changes in salinity

Abstract: When mudskippers were fully submerged in 100% seawater (SW), the mortality of Boleophthalmus boddaerti was higher than that of Periophthalmus chrysospilos. However, this trend was reversed when mudskippers were submerged in dechlorinated tap water or in 10% SW. The plasma osmolality of P. chrysospilos exposed to 80% SW was significantly higher than that of control fish free to be in or out of 50% SW and that of fish submerged in 10% or 50% SW. The muscle and liver of the fish exposed to 80% SW also contained significantly higher levels of ninhydrin-positive substances (NPS). In addition, the aminating activity of glutamate dehydrogenase (GDH) in the extracts from the liver and muscle of P. chrysospilos submerged in 80% SW for 7 days was significantly higher than those of fish submerged in 10% SW for the same period. However, the levels of NPS in the muscle and liver of B. boddaerti were unchanged by changes in salinity. Furthermore, the aminating and deaminating activities of GDH in the extracts from the liver and muscle of B. boddaerti, after fish had been submerged in 80% SW for 7 days, were not significantly different from those of fish submerged in 10% SW for a similar period of time. Such differences between the two species of mudskippers in response to changes in salinity may be correlated to the differences in the environmental conditions in their natural habitats.

Fatty acids of the mud skipper boleophthalmus boddaerti

Abstract: The fatty acid composition of the body and the liver lipids of Boleophthalmus boddaerti, a mud skipper fish belonging to the Gobiidae family, have been determined by argentation column chromatography (a.c.c.) and gas-liquid chromatography (g.l.c.). The levels of 20:5ω3 (ca 14%), a biologically important fatty acid, was found to be considerably high. Other major component acids were, 16:0, 18:0, 16:1, 18:1, 20:3ω9, 22:5ω3 and 22:6ω3. Besides, a large number of minor components were identified and estimated. The liver lipid contained unusually high levels (ca 90%) of non-saponifiables.