{"refrec":{"BRefID":126235,"RR":"<b>Koopmans, M.; Wijffels, R.H.</b> (2008). Seasonal growth rate of the sponge <i>Haliclona oculata</i> (Demospongiae: Haplosclerida). <i>Mar. Biotechnol. 10(5)</i>: 502-510. <a href=\"https://dx.doi.org/10.1007/s10126-008-9086-9\" target=\"_blank\">https://dx.doi.org/10.1007/s10126-008-9086-9</a>","BEntID":120343,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Mar. Biotechnol. 10(5)</i>: 502-510. <a href=\"https://dx.doi.org/10.1007/s10126-008-9086-9\" target=\"_blank\">https://dx.doi.org/10.1007/s10126-008-9086-9</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Koopmans, M.; Wijffels, R.H.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Koopmans, M.; Wijffels, R.H.","Englishabstract":"The interest in sponges has increased rapidly since the discovery of potential new pharmaceutical compounds produced by many sponges. A good method to produce these compounds by using aquaculture of sponges is not yet available, because there is insufficient knowledge about the nutritional needs of sponges. To gain more insight in the nutritional needs for growth, we studied the growth rate of <i>Haliclona oculata</i> in its natural environment and monitored environmental parameters in parallel. A stereo photogrammetry approach was used for measuring growth rates. Stereo pictures were taken and used to measure volumetric changes monthly during 1 year. Volumetric growth rate of <i>Haliclona oculata</i> showed a seasonal trend with the highest average specific growth rate measured in May: 0.012±0.004 day<sup>-1</sup>. In our study a strong positive correlation (p<0.01) was found for growth rate with temperature, algal biomass (measured as chlorophyll a), and carbon and nitrogen content in suspended particulate matter. A negative correlation (p<0.05) was found for growth rate with salinity, ammonium, nitrate, nitrite, and phosphate. No correlation was found with dissolved organic carbon, suggesting that <i>Haliclona oculata</i> is more dependent on particulate organic carbon. 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