Add salt to your fish’s diet?

This abstract details that 7.5g of salt added per kilogram of food will improve growth rate in angelfish….

I wonder if it’s just increased water retention…

I guess you’ll have to read the whole paper to find out.

Journal of Applied Aquaculture
Volume 24, Number 1 (January 2012)
	Effects of Different Dietary Salt Levels on Growth and Salinity Tolerance of Angel Fish (Pterophyllum scalare)
	Authors:	SomayehPourali Motlagh 1, AsadMohammadi Zarejabad 1, Ehsan Ahmadifar 2
	Author Affiliations:	1: Department of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources 2: Fisheries Department, Faculty of Natural Resources, University of Zabol
	Source:	Journal of Applied Aquaculture, Volume 24, Number 1 (January 2012)
	Page Numbers:	1 – 7
	Available Full Text:	Full Text: Subscription Required to view full text Format: PDF Size: unknown Location: Publisher’s Site Authentication: EBSCOhost EJS
	Abstract:	This study investigated the effects of dietary salt (NaCl) levels on growth performance and salinity tolerance of angel fish (Pterophyllum scalare). Five diets were supplemented with 0 (control), 7.5, 15, 22.5, and 30 g kg-1salt, respectively. Over 56 days, weight gain and specific growth rate were similar for the fish fed diets supplemented with 0 (control), 22.5, and 30 g kg-1salt (P > 0.05), but slightly lower than fish fed the 7.5 and 15 g kg-1salt diets. Results showed that addition of 7.5 and 15 g kg-1salt to diets slightly increased specific growth rate (SGR), while decreased food coefficient ratio (FCR) and the highest final weight were observed in fish fed the diet containing 7.5 g kg-1salt. There was no significant difference in survival rate among groups at experimental period (P > 0.05). At the end of experiment, the angel fish were exposed to salinity stress (6, 9, and 12 ppt). There was no significant obvious trend in survival index after 48-h salinity stress (P < 0.05).
	Citation:	SomayehPourali Motlagh, AsadMohammadi Zarejabad, Ehsan Ahmadifar . Effects of Different Dietary Salt Levels on Growth and Salinity Tolerance of Angel Fish (Pterophyllum scalare). Journal of Applied Aquaculture, Volume 24, Number 1 (January 2012), pp. 1-7, <http://ejournals.ebsco.com/direct.asp?ArticleID=41809D158D9A1AE5E8A4&gt;
	URL:	http://ejournals.ebsco.com/direct.asp?ArticleID=41809D158D9A1AE5E8A4