Der er så vidt jeg ved ingen ydre tegn på kønnet.
Men prøv at nær læse denne.
This is the article I translated a few weeks ago for Sylvio:
The demand for marine ornamentals has been steadily rising from the increased interest of aquarium enthusiasts. With an estimated 5% of the supply being aquacultured, Hawaiian reefs currently supply a hefty portion of the world’s marine ornamental fish. The second year of the CTSA project, Aquaculture of Marine Ornamentals,
combines the skilled research background of scientists from The Oceanic Institute (OI) and the Waikiki Aquarium to lessen the world’s reliance on wild-caught ornamentals and assist in the diversification of the state’s economy by researching the culture of marine ornamental species with difficult-to-rear larvae. More specifically, the project will address the the two key bottlenecks in the culture of marine ornamentals – reproduction and firstfeeding. The Aquarium’s component will focus expressly on the larvae’s consumption of zooplankton. As reported in a previous Regional Notes (Vol. 12 No. 2), the project working group at OI, with additional funding support from the National Marine Fisheries Service, had established broodstock populations for both the yellow tang (
Zebrasoma flavescens) and the flame angelfish (Centropyge loriculus) and obtained successful captive spawning for the flame angelfish. Although the OI group was able to achieve spawns for the yellow tang, the eggs were initially all infertile. However, OI has recently accomplished isolated spawns with fertility rates up to 88% and fecundity has increased 100 fold. They are also now able to identify and separate the sexes based on external characteristics. The yellow tang was found to be sexually dimorphic with males identified by the presence of a bristle patch along the caudal peduncle. Additionally, the OI group has demonstrated the existence of a lunar rhythm in the spawning activity. Initial diet trials were conducted with the larvae that resulted from some of the spawns in an attempt to compare various live food organisms as first feeds for yellow tang. Further work on this element is planned, as survival past Day 5 was so low that the experiment could not continue. Future activities planned for the OI component of this project will examine the usefulness of hormones to induce spawning in yellow tang. Researchers originally thought hormones would be needed to induce spawning but having achieved success without them, they still feel hormone induction will enable them to stimulate reproductive maturation and increase spawn fertility. OI also anticipates developing an egg disinfection protocol for small marine ornamental eggs. The Aquarium has completed certification required by the University of Hawaii’s Institutional Animal Care and Use Committee and will begin work shortly.
Jeg har læst et sted, at hanner har en lille (meget lille ?) "finne kam" ved halen. Betyder det, at min er en hun (for det har hun ikke), eller at det bare er fis ?
Det var "...males identified by the presence of a bristle patch along the caudal peduncle", jeg ikke kunne få til at passe på min tang.