The larvae of coral reef fishes have been studied in order to determine the composition of fish larval community in Mabahiss bay located at Hurghada on the Egyptian Red Sea coast. Fish larvae were collected monthly from November 2012 to October 2013 by plankton net of 0.5 mm mesh size.A total of 1336 fish larvae comprising 57 fish taxa were recorded from all habitats. The highest number of larvae (517) was collected from the open water areas, whereas the lowest of 129 larvae were taken from seagrass areas. The highest number of species was recorded from the open water areas (39 taxa), while the lowest number of species was taken from the seagrass area (19 taxa).Results obtained from the present study reflect the importance of different Red Sea habitats to the early life history of reef fishes and how they could support these stages.
Rotifers are an essential starting live food for many fish and crustacean larvae in marine hatcheries. Recently, high-density intensive systems for the culture of the rotifer Brachionus plicatilis were initiated as an alternative for the traditional batch culture systems. Among the most common problems facing intensive culture systems, is the accumulation of dissociated ammonia (NH 3) which hinders the development of this technique. This study was conducted to test the effect of different ammonia removal compounds on the population growth of the rotifer, Brachionus plicatilis in an intensive system. The experimental closed-system design is composed of a rearing tank (100l capacity), a protein skimmer and a settling tank. Rotifers were fed with concentrated microalgae cells, Nannochloropsis oculata(3 x 10 9 cell/ml) and each experiment lasted for 10 days at 24C 0. To investigate the effect of ammonia removers on population growth of rotifers, two commercial water conditioners were used (ChlorAm-X®, sodium hydroxymethanesulfonate, Aqua Science Research Group, Inc., MO, USA., added daily at a rate of 0.25 gm/10 6 rotifers) and (Ammo-Lock*, a registered trademark of Mars Fishcare, North America, Inc. added once at one gm/1l of culture water). At the end of each experiment, rotifer population numbers ranged from 300-1800 individual/ml. The best treatment method to get rid of ammonia and attain high population growth rates of rotifers was the use Ammo-Lock* followed by ChlorAm-X®.
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