Marble Goby Research Articles

Glochidiosis and juvenile production in a freshwater pearl mussel,Chamberlainia hainesiana

Summary Experiments on glochidiosis of the freshwater pearl mussel, Chamberlainia hainesiana, were carried out using the fry of four species of fish, namely Temminck's kissing gourami (Helostoma temmincki), striped tiger nandid (Pristolepis fasciatus), walking catfish (Clarius macrocephalus) and sand goby (Oxyeleotris marmoratus). The fry were exposed to four concentrations of glochidia, and the LE50 values (the concentrations that killed 50% of the fry) were determined. The most resistant species was O. marmoratus, which also gave the highest production of juvenile mussels. Juveniles appeared 18–27 days after infection.

Hepatic 5′-monodeiodinase activity in teleosts in vitro: A survey of thirty-three species

The in vitro hepatic 5'-monodeiodination of thyroxine (T4) to triiodothyronine (T3) in Oreochromis mossambicus, Channa striata, Clarias batrachus, Cyprinus carpio and Oxyeleotris marmorata was found to be time, pH and temperature dependent, and related to the amount of substrate (T4) and homogenate introduced into the reaction vessel, in a manner which was consistent with Menton-Michaelis kinetics, and thus indicative of an enzyme-regulated process. Dithiothreitol introduced into the reaction vessel stimulated T3 production in a dose-related manner.Hepatic 5'-monodeiodinase activity was also detected in a further 28 species of teleosts suggesting that the peripheral monodeiodination of T4, which is well-documented in salmonids, is also widespread amongst other teleost fishes. All species examined exhibited evidence of enzymatic deiodination, but there were marked differences in Km and Vmax values between the species. There was no apparent phylogenetic or environmental relationships to explain the widely divergent Km and/or Vmax values, nor was there a correlation between Km and Vmax when the species were considered together.

Studies on the effect of air exposure on gill Na+/K+-ATPase of the marble goby,Oxyeleotris marmorata, a facultative air-breathing fish

Gill and liver microsomal Na(+)/K(+)-adenosine triphosphatase (ATPase) activities, body weight, and several blood parameters were measured in marble gobies held in freshwater, in air on wet filter paper for 7 days and three days after return to freshwater following 7 days in air. During the 7 days in air, body weight, and blood Na(+) and K(+) concentrations remained unchanged. During the same period, however, mean specific activity of the gill ATPase fell 79% while liver ATPase specific activity was unchanged. When these fish were returned to water the specific activity of the gill ATPase returned to values seen in freshwater gobies within 3 days. Several changes were also noted in the characteristics of the ATPase in the fish held in air.

Calcium Fluxes in the Teleost Fish Tilapia (Oreochromis) in Water and in Both Water and Air in the Marble Goby (Oxyeleotris) and the Mudskipper (Periophthalmodon)

Unidirectional and net extrarenal calcium fluxes in water and in air on wet filter paper were obtained in the mudskipper, Periophthalmodon schlosseri, an obligate air breather, and in the marble goby, Oxyeleotris marmorata, which is fundamentally a water-breathing fish but which can survive extended periods of time on wet filter paper (facultative air breather). For comparison purposes, values were also obtained in water only from tilapia, Oreochromis mossambicus. This fish, which is an obligate water breather and cannot survive long in air, showed rates of influx, efflux, and net flux that were more than double those shown by the two species of gobies in water. In turn, the marble goby had significantly higher rates of influx, efflux, and net flux in water than seen in the mudskipper, Periophthalmodon schlosseri. The difference in net flux between Oxyeleotris and Periophthalmodon was not apparent when the fish were maintained on wet filter paper. On wet filter paper, when branchial/water contact was abolished, both the marble goby and the mudskipper showed significant reductions in unidirectional influx, but the specific activity of the blood was the same as when in water. Normal net flux rates were maintained because efflux decreased to near zero. The results suggest that much of the necessity to maintain an influx of calcium in fish is directly attributable to the necessity to replace calcium lost during branchial irrigation. We conclude, therefore, that these two species can perform cutaneous calcium transport at least when their gills are not exposed to water.

Food resource utilization partitioning of fifteen fish species at Bukit Merah Reservoir, Malaysia

Statistical and mathematical models have been used to measure the subtle differences in food resources utilisation of fifteen (15) fish species at Bukit Merah Reservoir, Malaysia. The models employed are niche breadth, dietary overlap indices and discriminant analysis. A diet measure based on the relative importance index of food items was used for the analysis, to correct for biases of the single indices consisting of the volumetric, numerical and occurrence frequency. Niche breadth (Bi) indicating the diversity or breadth of the food resource gradient utilized by a fish classifies species as generalized feeders (Bi > 4.5), intermediate and specialized feeders (Bi 0.60) for most fish at the reservoir; but Trichogaster pectoralis (Anabantidae) feeding on the plankton shows relatively low dietary overlap. A scatter plot and a territorial map of the discriminatory analysis on the dietary composition result in combination an objective basis for trophic classification of the fish community, and describe (1) Osteochilus hasselti and Puntius gonionotus as herbivores, (2) Oxyeleotris marmorata, Clarias batrachus, Ophicephalus striatus, Mystus planicep, and presumably Wallago leerii and Hampala macrolepidota as carnivores, (3) Puntius schwanenfeldii, Cyclocheilichthys apogon, and presumably Labiobarbus festiva as detritivores, (4) Notopterus notopterus as a generalist, and (5) Trichogaster pectoralis as a planktivore. This multivariate analysis is relatively superior to the traditional subjective method for trophic classification and discerning subtle differences objectively, though intermingling occur.

Characteristics of a birnavirus isolated from cultured sand goby Oxyeleotris marmoratus

Characteristics of a birnavirus isolated from cultured sand goby Oxyeleotris marmoratus

Henneguya shaharini sp. nov. (Protozoa: Myxozoa), a parasite of marble goby, Oxyeleotns marmoratus (Bleeker)

Abstract. Henneguya shaharini sp. nov. is described from marble goby, Oxyeleotns marmoratus, collected in the State of Selangor, Malaysia. Cysts occurred in the gill filaments. The histopathological examination revealed intralamellar and inter‐lamellar forms of infection. A host tissue response against the parasite was seen in some fish.

Some problems in the cage culture of marble goby ( Oxyeleotris marmorata Bleeker)

Some problems in the cage culture of marble goby ( Oxyeleotris marmorata Bleeker)

Induced breeding and early development of the Marble Goby ( Oxyeleotris marmorata, Blk.)

Oxyeleotris marmorata was induced to ovulate using human chorionic gonadotropin, followed by successful artificial fertilization. The mean diameter of the unfertilized egg was 0.83 mm. The egg elongated on contact with water with an increase in length of about 53%. Over 90% of the eggs were fertilized, of which over 90% hatched subsequently. Hatching time was extremely variable, ranging from 2 to 5 days after fertilization, when the eggs were hatched in petri-dishes at a temperature of 27±1°C, but it was fairly constant at around 3 days after fertilization when the eggs were hatched in continuously aerated and filtered water at a constant temperature of 27°C. The larvae did not survive for more than a few days. This problem of larval mortality is discussed. The sex differentiation and the embryonic development of the fish are described.