107 research outputs found
The effect of a 24-hour photoperiod on the survival, growth and swim bladder inflation of pre-flexion yellowfin tuna (Thunnus albacares) larvae
The effects of two different continuous photoperiod regimes on survival, growth and swim bladder inflation of pre-flexion yellowfin tuna (Thunnus albacares) larvae were investigated. Each photoperiod regime was tested twice with a different larval cohort to confirm the observed results. Trials 1 and 2 tested the effect of a reduced night-time light intensity (10-molesm-2s-1=30% of the daytime intensity) and found that those larvae reared for 8days under the 24h lighting (24-L) photoperiod exhibited a slight improvement in survival compared to those reared under the control photoperiod of 12h light (12-L), however these improvements were not significant. In addition, those larvae reared under this photoperiod regime were equal in length to those in the control. Trials 3 and 4 compared the same variables in larvae reared under a continuous photoperiod (24-L) with a constant light intensity of 30-molesm-2s-1, against those reared under the aforementioned 12-L photoperiod. Survival of larvae under the continuous photoperiods were 9±1% (n=2) and 10±2% (n=3) for Trials 3 and 4, respectively, compared to less than 1% in both control treatments; differences that in both cases were highly significant. In addition, in both trials larvae cultured under the 24-L photoperiod were significantly larger and exhibited more advanced development than those reared under the 12-L photoperiod, however swim bladder inflation was significantly lower. We suggest that the improved survival and growth achieved under a continuous photoperiod is due to the extended foraging time combined with the prevention of mortality caused by night-time sinking
Ancillary techniques on the evaluation of canine cutaneous mast cell tumors from Brazil
Effect of the dry matter intake level on the sanguine profile of glucose, insulin, urea, estrogen and progesterone and concentration of IGF-I in the follicular liquid of crossbred heifers
Selective Exposure to Berita Harian Online and Utusan Malaysia Online: The Roles of Surveillance Motivation, Website Usability and Website Attractiveness
News media allows audiences to be selective in determining both their news sources
and type of news stories they read. This study examined factors influencing selective
exposure to the online editions of two mainstream Malaysian newspapers, Berita
Harian and Utusan Malaysia. Using selective exposure theory as the theoretical
lens, this study compared both newspapers in terms of their audiences’ level of
surveillance motivation, and how audiences rate the newspapers’ websites with respect
to usability and attractiveness. This study used a within-subject experimental research
design that exposed 51 subjects to both Berita Harian and Utusan Malaysia online
newspapers. The results of the experiment indicate that Berita Harian and Utusan
Malaysia online were significantly different in terms of website usability; however,
no significant differences were found in terms of surveillance motivation or website
attractiveness between the two newspapers. Further analysis indicate that the only
significant predictor of selective exposure was website usability. This study highlights
the importance of website usability for online newspapers wanting to harness audience
selectivity
Multilamellar Liposomes Including Cholesterol as Carriers of Azobenzene Disperse Dyes in Wool Dyeing
Multi‐stage disruption of freshwater mussel reproduction by high suspended solids in short‐ and long‐term brooders
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