Volume 1 Issue 3
Feeding Behaviour of Larval European Sea Bass (Dicentrarchus labrax L.) in Relation to Temperature and Prey Density
Stefano Malavasi, Giacomo Cipolato, Carla Cioni, Patrizia Torricelli, Arianna Manciocco, Enrico Alleva, Mattia Toni*
The feeding behaviour of larval European sea bass (Dicentrarchus labrax, L.) was analysed in relation to temperature and prey density under controlled laboratory conditions with the aim to assess the ability of larval fish to change the feeding tactic as a response to environmental changes. Larvae were acclimated for 20 days at three different temperatures (19, 22 and 26°C), and their feeding behaviour was then video-recorded in experimental trials, at two prey densities, consisting of swarms of 400/l and 1440/lArtemia nauplii.
Valve Activity in Cultured Oysters Exposed to Sudden Increases in Salinity
Timothy Williamson*, David Tilley, Yang Tao
The submergence of live cultured Crassostrea virginica in high salinity seawater (> 28 parts per thousand, ppt) is a practice the seafood industry may consider for enhancing taste and marketability. We investigated the response of triploid C. virginica, cultured in mesohaline areas of Chesapeake Bay, to sudden exposure to elevated salinity in artificial seawater. Valve activity and duration of valve closure was recorded for three levels of salinity—14 parts per thousand (ppt), 22 ppt, and 28 ppt—in aerated 17-liter aquariums for 72 hours.
Effects of Salinity and Algal Diets on the Elimination of Cadmium in Crassostrea rivularis
Ni Wu, Zhenjv Li, Jieru Cao, Tao Niu, Huasheng Cheng, Tianjiu Jiang*
The present study aimed to study the effects of salinity (12, 16, 20, 24, and 28) and algal diets (Platymonas subcordiformis, Chlorella sp. and a mixture of P. subcordiformisand Chlorella sp.) on the elimination of cadmium (Cd) from oysters (Crassostrea rivularis). The Cd accumulation in oysters was also studied. The results showed that the accumulation of Cd in C. rivularis was related to the exposure time (P<0.01)
The Current Status of Grouper Culture Operations and Cost Analysis of the Industry in Taiwan
Benjamin C. Young, Shinn-Pyng Yeh, Rebecca H. Chung and Pai-Po Lee*
The main objective of this study is to evaluate the different operations sector and cost information in Taiwan grouper culture industry through survey. Results showed that, the most important cultivable species in Taiwan was orange-spotted grouper (Epinephelus coioides). Further, the farm size for grouper culture ranged between 1 to 5 hectares. The farmer had employed three or less farm staffs throughout the culture period. Moreover, the harvested grouper were mainly sold to wholesaler and to some regular customers.