What photoperiod is best for raising fish larvae?

Like many other very young animals, fish larvae would require higher feed frequency. This research article shows that larval survival and growth rate are significantly higher with longer ‘daylight’.

Aquaculture Research
Volume 44, Number 1 (December 2012)
	Larviculture of burbot (Lota lotaL.): larval rearing using Artemiaand weaning onto dry feed
	Authors:	Hendrik Wocher, Alexander Harsányi, Frieder J Schwarz
	Author Affiliations:	no affiliations available
	Source:	Aquaculture Research, Volume 44, Number 1 (December 2012)
	Page Numbers:	106 – 113
	Available Full Text:	Full Text: Subscription Required to view full text Format: PDF Size: unknown Location: Publisher’s Site Authentication: EBSCOhost EJS
	Abstract:	The burbot (Lota lota) is the only gadoid fish in freshwater and could be an interesting candidate for an aquaculture production. The objective of this study was to develop suitable rearing techniques for early life stages of burbot larvae under intensive rearing conditions. Burbot larvae were reared with live food (Artemia salinanauplii) whilst the effects of different photoperiods (24 h light and 12 h light) and ration level on growth and survival of the larvae were investigated from 7 to 56 days posthatching (dph). Larvae reared under continuous light survived (45.4%) and grew better [specific growth rate (SGR): 7.9 % day-1] than under 12 h light (34.2% respectively 7.1 % day-1). Rearing burbot larvae with three different ration levels [20–80 (I), 40–160 (II) and 80–320 (III) Artemiaper larva per day] resulted in a clear relationship between food availability and larval performance [SGR: 8.1 (I), 9.2 (II) and 10.0 (III) % day-1]. Burbot larvae were weaned from Artemiaonto two commercial microparticulate diets (MPD). Two different particle sizes of MPD1 (AGLONORSE) and MPD2 (START) were introduced on 35 and 56 dph. The two weaning experiments were conducted independently of one another. The MPD2 was not accepted at all, thus none of the larvae survived. Feeding of MPD1 from 56 to 91 dph resulted in better growth (SGR: 9.7 % day-1) and survival rate (13.5%) as distinct from 35 to 70 dph (SGR: 4.6 % day-1, survival rate: 10.5%). The results of our study indicate the potential of the burbot for a successful commercial larviculture in the future.
	Citation:	Hendrik Wocher, Alexander Harsányi, Frieder J Schwarz . Larviculture of burbot (Lota lotaL.): larval rearing using Artemiaand weaning onto dry feed. Aquaculture Research, Volume 44, Number 1 (December 2012), pp. 106-113, <http://ejournals.ebsco.com/direct.asp?ArticleID=4D60ABCC3BBA92C1EFBC&gt;
	URL:	http://ejournals.ebsco.com/direct.asp?ArticleID=4D60ABCC3BBA92C1EFBC