Journal of Marine Biology

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This study investigated the effects of salinity changes on some of growth and survivalindexes of (Tetraodonbiocellatus). It was done with a complete randomized including 36 puffer fish fry (2 gr weight and 2.5 cm length) which provided from brood stock, and by using four concentrations (0.5,10, 15mg/lit)of sea salt in water. Thelength, weight, growth and survival indexes were measured. Moreover the salinity affects on branchiachloride cells andreins malpigy stuffs were investigated. At last results showed that numbers the salinity increase causes increaseof branchiachloride cells numbers and decrease of reins malpigy stuffsnumbers.The maximum growth of length and maximum survival rate were seen in 5ppt and10pptsalinitiesrespectively. The differences seen in length of different treatments was not significant)p>0.05), butregarding the weight, significant differenceswere identified after four week in treatments (p<0.01) and of course Even in fifth and sixth weeks,it reached to its highest point. In addition,theresults showed that puffer fish wouldn't have remarkable mortality at salinity changes of 0-15, namely. The fish species is adaptable to salinitychanges. So it seems there is the possibility of keeping fish in fresh water aquarium.

Keywords: puffer fish (Tetraodon biocellatus), growth, chloride cells, malpigy stuffs, adaptation

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