مقايسه ﭘﺮورش ﻣﺎﻫﯽ ﺳﯽ ﺑﺎس آﺳﯿﺎﯾﯽ (Lates calcarifer) در آب ﺷﯿﺮﯾﻦ و آب درﯾﺎ: اﺛﺮ ﺑﺮ ﺷﺎﺧﺺ ﻫﺎي رﺷﺪ، ﺗﻐﺬﯾﻪ و ﺗﺮﮐﯿﺐ ﺑﯿﻮﺷﯿﻤﯿﺎﯾﯽ ﻻﺷﻪ

Comparison of Asian sea bass (Lates calcarifer) in freshwater and seawater: effects on growth and feeding performance and body composition

ﻫﺪف از اﯾﻦ ﻣﻄﺎﻟﻌﻪ، ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ ﺟﻮاﻧﺐ ﻣﺨﺘﻠﻒ ﭘﺮورش ﻣﺎﻫﯽ در آب ﺷﻮر و ﺷﯿﺮﯾﻦ و ﺗﺄﺛﯿﺮﮔﺬاري ﺑﺮ ﺷﺎﺧﺺ-ﻫﺎي رﺷﺪ، ﺗﻐﺬﯾﻪ و ﺗﺮﮐﯿﺒﺎت ﺑﯿﻮﺷﯿﻤﯿﺎﯾﯽ ﻻﺷﻪ ﻣﺎﻫﯽ ﺳﯽﺑﺎس آﺳﯿﺎﯾﯽ اﺳﺖ ﮐﻪ ﻣﺎﻫﯿﺎن ﺑﺎ ﻣﯿﺎﻧﮕﯿﻦ وزن اوﻟﯿﻪ 0/9 ± 33 ﮔﺮم در ﺗﺎﻧﮏﻫﺎي ﻣﺪور ﺳﯿﺼﺪ ﻟﯿﺘﺮي ﭘﻠﯽاﺗﯿﻠﻨﯽ در ﺳﻪ ﺗﮑﺮار ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻨﺪ. ﻏﺬادﻫﯽ دو ﺑﺎر در روز و ﺗﺎ ﺣﺪ ﺳﯿﺮي ﺑﻪ ﻣﺪت 60 روز اﻧﺠﺎم ﺷﺪ. ﻧﺘﺎﯾﺞ ﺣﺎﺻﻞ ﺑﯿﺎﻧﮕﺮ اﯾﻦ ﺑﻮد ﮐﻪ ﭘﺮورش ﻣﺎﻫﯽ ﺳﯽﺑﺎس آﺳﯿﺎﯾﯽ در آب ﺷﯿﺮﯾﻦ و آب درﯾﺎ، اﺛﺮ ﻣﻌﻨﺎداري ﺑﺮ ﺷﺎﺧﺺﻫﺎي ﻋﻤﻠﮑﺮدي رﺷﺪ )ﺑﻪ ﺟﺰ ﻣﯿﺎﻧﮕﯿﻦ ﻃﻮل ﺛﺎﻧﻮﯾﻪ( ﻧﺪارد )0/05 >p(. ﻣﯿﺎﻧﮕﯿﻦ ﻃﻮل ﺛﺎﻧﻮﯾﻪ در ﺗﯿﻤﺎر آب ﺷﻮر ﺑﻪ ﻃﻮر ﻣﻌﻨﺎداري ﺑﯿﺸﺘﺮ ﺑﻮد )0/05 < p(. ﻋﻼوه ﺑﺮ اﯾﻦ، از ﻣﯿﺎن ﭘﺎراﻣﺘﺮ ﺗﻐﺬﯾﻪاي ﻣﺤﺎﺳﺒﻪ ﺷﺪه، ﺗﻨﻬﺎ ﺷﺎﺧﺺ ﻏﺬاي درﯾﺎﻓﺘﯽ ﺑﯿﻦ ﺗﯿﻤﺎرﻫﺎ داراي اﺧﺘﻼف ﻣﻌﻨﺎدار ﺑﻮد )0/05 < p( و ﺳﺎﯾﺮ ﺷﺎﺧﺺ ﻫﺎ و ﺗﺮﮐﯿﺐ ﺑﯿﻮﺷﯿﻤﯿﺎﯾﯽ ﻻﺷﻪ اﺧﺘﻼف ﻣﻌﻨﺎداري ﻧﺸﺎن ﻧﺪادﻧﺪ. ﻣﺎﻫﯿﺎﻧﯽ ﮐﻪ در آب ﺷﯿﺮﯾﻦ ﭘﺮورش داده ﺷﺪﻧﺪ داراي ﺿﺮﯾﺐ ﺗﺒﺪﯾﻞ ﻏﺬاﯾﯽ ﭘﺎﯾﯿﻦﺗﺮي )0/06 ± 0/92( ﺑﻮدﻧﺪ، ﺑﺎ اﯾﻦ ﺣﺎل، اﯾﻦ ﺗﻐﯿﯿﺮات ﺑﻪﺻﻮرت ﻣﻌﻨﺎدار ﻧﺒﻮد )0/05 > p(. ﺑﻪﻃﻮر ﮐﻠﯽ اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﻧﺸﺎن داد ﮐﻪ اﯾﻦ ﮔﻮﻧﻪ ﻣﯽﺗﻮاﻧﺪ داﻣﻨﻪاي وﺳﯿﻊ از ﺷﻮريﻫﺎي ﻣﺨﺘﻠﻒ را در ﻣﺤﺪوده زﻣﺎﻧﯽ 60 روزه ﺗﺤﻤﻞ ﮐﻨﺪ و در اﯾﻦ ﻣﺪت رﺷﺪ ﻣﺘﻨﺎﺳﺒﯽ ﺑﺪون ﻧﺸﺎن دادن ﻫﯿﭻﮔﻮﻧﻪ ﺗﻠﻔﺎت داﺷﺘﻪ ﺑﺎﺷﺪ.

To investigate the effect of its various aspects and the effect on growth, nutrition, and biochemical composition of body, Asian Sea bass fish with an average initial weight of 33 ± 0.9 gr were experimented in three hundred-liter polyethylene circular tanks in three repetitions. Feeding was done twice a day for up to 60 days. The results showed that growing Asian sea bass in fresh-water and seawater did not have a significant effect on growth performance indicators (except for the average final length) (P > 0.05). The mean secondary length in saltwater treatment was significantly higher (P < 0.05). Therefore, In addition, among the calculated nutritional parameters, only the food index received between treatments had a significant difference (P < 0.05) and other indicators and biochemical body compounds did not show a significant difference (P > 0.05). Cultivation of freshwater fish has a lower feed conversion ratio (0.92 ± 0.06); however, these changes were not significant. Overall, the study showed that it can withstand a wide range of different salinities for 60 days and grow well without showing any casualties.