The effects of different diatom species and types of substrates in combination with 0.45 lM GABA on the metamorphosis of Haliotis asinina larvae were tested. Diatom slurry elicited the best metamorphic response followed by Amphora sp., Amphora + Nitzschia and Nitzschia cf. frustulum in that order. With regards to substrate types, roughened plexiglass seemed to be the most preferred while fibrocement the least preferred surface. Overall, diatom slurry grown on plexiglass surface promoted the greatest number of metamorphosed H. asinina postlarvae. For economic considerations and practical reasons, chemical inducers like gamma-aminobutyric acid (GABA), should be used singly or separately from other settlement-inducing cues, such as the ''substrate-diatom'' complex.
An opercular tag for marking adult milkfish (Chanos chanos Forsskal) and seabass (Lates calcan erBloch) is described. High tag retention and relatively low mortality rates were observed in adult 2 Ish handled two to ten times during 14-to 60-day tests. The features and advantages of the tag for marking large-sized fish in short-term studies are discussed.
Zusammenfassung
Eine preiswerte Markierung fur Kurzzeitstudien des Milchfisches (Chanos chanos Forsskal) und derCentropomidae (Lates calcarifer Bloch) Eine Kiemendeckel-Markierung fur adulte Milchfische (Chanos chanos Forsskal) und Centropomidae (Lates calcacifer Bloch) wird beschrieben. Sie zeichnet sich durch gute Haltbarkeit aus und verursacht relativ geringe Mortalitat bei adulten Fischen, die in Versuchen von 14 bis 60 Tage Dauer 2-bis 1Omal untersucht wurden. Die Eigenschaften und Vorteile dieser Markierung fur groae Fische in Kurzzeitstudien werden diskutiert.
Risumi
Un marquage iconomique pour des itudes de courte durie du chandi (Chanos chanos Forsskal) et du centropomidk (Lates calcarifer Bloch)Un marquage d'o ercule pour les chanidts (Chanos chanos Forsskal) et les centropomides (Lates calcarifer Bloch) afultes est decrit. Une bonne conservation et une mortalit6 relativement basse ont ttC observies chez des poissons adultes examines 2 h 10 fois pendant des experiences d'une duree de 14 i 60 jours. Les caracteristiques et les avantages du marquage de poissons de grande taille pendant des experiences d'une courte duree sont discutes.
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