Abstract Melanotaenia ajamaruensis with the common name Ajamaru Rainbowfish belongs to group that endemic of Lake Papua, Indonesia. These fish are very potential as ornamental fish, but biological information is rare. The has just domesticated, therefore a research inceased reproductive factors in captivity needed. reproduction ability was conducted by using various levels Spirulina feed (A=0; ...

Several types of composite eggs were found in two species of paedogenetic gall midges. One composite egg, consisting of two blastoderms, was cultured in vitro, and its development was recorded on film. Two other composite eggs were fixed in the oocyte stage; each contained two nurse chambers, two egg chambers and one oocyte nucleus. Some other 'eggs' are described, which consisted merely of a n...

Disinfection by ozonation of sea-water may reduce the risk of transmission of nodavirus, a major fish pathogen, via Atlantic halibut Hippoglossus hippoglossus eggs. In the present study, eggs at 4 d prior to hatching were exposed to nodavirus and then to ozonated sea-water using different concentrations (0.3 to 10 mg l-1) and exposure times (0.5 to 10 min). None of the larvae from virus-exposed...

The passive bioacoustic technique has the principle of operation is to use underwater sound recording equipment, collecting signals emitted by fish during spawning season, analyze software, through which it possible identify identified species name, population size, and location broodstock in study area. In this study, we used a combination method analyzing density eggs larvae croaker Tien Yen ...

We investigated whether adult fruit flies (Drosophila melanogaster) use cues of larvae as social 2 6 information in their food patch choice decisions. Adult male and female fruit flies showed 2 7 attraction to odours emanating from foraging larvae, and females preferred to lay eggs on food 2 8 patches occupied by larvae over similar unoccupied patches. Females learned and subsequently 2 9 prefe...

Emergence and survival of adults for 24 hwas compared forTrichogramma chilonis Ishii reared on eggs of Corcyra cephalonica (Stainton) adults whose larval growth and development had beenmonitored on broken grains of four different cereals: Þngermillet (Eleusine coracanaL.Gaertn), softwhitewheat (TriticumaestivumL), short-grainedwhite rice (Oryza sativaL.), anddurra sorghum (Sorghum bicolor L. Mo...

We investigated whether adult fruit flies (Drosophila melanogaster) use cues of larvae as social information in their food patch choice decisions. Adult male and female fruit flies showed attraction to odours emanating from foraging larvae, and females preferred to lay eggs on food patches occupied by larvae over similar unoccupied patches. Females learned and subsequently preferred to lay eggs...

The responses of eggs in diapause and the infective stage of the nematode, Strelkovimermis spiculatus, to larvae of its host, Culex pipiens pipiens, were investigated in the laboratory. The results indicated that the presence of the host induced the egg hatching. The hatching rate increased when larger numbers of host larvae were present. Second instar mosquito larvae induced significantly high...

We describe findings of three ichthyoplankton surveys undertaken along south-eastern Australia during spring (October 2002, 2003) and winter (July 2004) to examine spawning habitat and dynamics of blue mackerel (Scomber australasicus). Surveys covered 860 nautical miles between southern Queensland (Qld; 24.6 S) and southern New South Wales (NSW; 41.7 S), and were mainly centred on the outer she...