اثرعوامل اکولوژیک شوری و دما درپرورش متراکم پاروپای گونه Acartia tonsa دریای خزر

نوع مقاله: مقاله پژوهشی

نویسندگان

1 1. کارشناسی ارشد تکثیروپرورش آبزیان، گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران

2 2. دانشیار گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران

3 3 .استادیار سازمان تحقیقات و آموزش جهادکشاوزری، موسسه تحقیقات علوم شیلاتی، پژوهشکده اکولوژی دریای خزر ساری

چکیده

پاروپایانی نظیر Acartia tonsa از نظر آبزی­پروری بدلیل دارا بودن میزان هم­آوری زیاد، زمان تجدید نسل کوتاه­ و نیز مقاومت نسبت به تغییرات شوری و دما دارای اهمیت قابل توجهی اند. لذا تولید انبوه A. tonsa جهت استفاده از آن به عنوان غذای زنده در صنعت آبزی­پروری از اهداف این تحقیق بوده است. در این مطالعه نقش عوامل اکولوژیک شوری و دما در چرخه زندگی گونة A. tonsa دریای خزر در شرایط آزمایشگاهی در سه تیمار دمایی(1±29، 1±27 و1±25 درجه­سانتیگراد) و دو تیمار شوری(ppt 12 و 17) طی مدت زمان 60 روز مورد بررسی قرار گرفت. این گونه توسط تورپلانکتون­ با اندازه چشمه100 میکرون از عمق تا 10 متر حوزه جنوبی دریای خزر (منطقه خزر آباد) جمع آوری شد. بررسی چرخة زیستی این زئوپلانکتون نشان داد که این گونه در طی 10-8 روز بالغ می­شود. بر اساس نتایج به دست آمده اختلافات معنی­داری در تعداد موجودات در مراحل ناپلیوسی و کوپه پودیت در شوری ها و درجه حرارت های مختلف مشاهده گردید (05/0>P). بیشترین  میزان تولید تخم، و تبدیل آنها به مرحلة ناپلیوس در دمای 29 درجه­سانتیگراد با شوری  ppt17 بود. بیشترین میزان بازماندگی این گونه نیز در همین شوری ثبت گردید. این تحقیق نشان داده است که در شرایط آزمایشگاهی می توان تولید انبوه از گونه A. tonsaباشوری  آب دریای خزر تهیه نمود که میزان تولید مثل آن در حدود 8-1 عدد تخم در روز بازای هر جانور ماده است که قابل مقایسه با تولید مثل طبیعی آن در دریا با حدود 50-11 عدد تخم در روز می باشد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effects of Ecological Factors of Salinity and Temperature on Intensive Culture of Acartia tonsa from the Caspian Sea

نویسندگان [English]

  • Fateme Shakeri1 1
  • Mohammad Ali Nematollahi2* 2
  • Arash Javanshir2 2
  • Abolghasem Roohi3 3
1 1 MSc of Aquaculture, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Iran
2 2 Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Iran
3 3 Assistant Professor, Iranian Fisheries Research Organization Ecological Research Caspian Sea, Sari, Iran
چکیده [English]

The present study carried out an in vitro experiment on effects of salinity and temperature on Acartia tonsa life cycle from Caspian Sea. During the experiment, temperature and salinity ranged 25, 27, 29 ± 1 °C and 12‰ and 17‰, respectively within a period of 60 days. Spawning rate was measured using mesh size of 100 µ planktonic net from surface to 10 m depth. Early results show that nauplii arrive to adult stage during 8-10 days. Significant differences in nauplii and copepodites stage were found also in different salinities and temperatures. High survival and spawning rate were also found in 17 ‰ and 29 °C (P < 0.05). Our investigations showed that in in vitro reproduction of A. tonsa in the Caspian Sea water with 1-8 eggs per each female may be feasible compared to 17-50 eggs in natural conditions.

کلیدواژه‌ها [English]

  • Caspian Sea
  • Copepods
  • Acartia tonsa
  • salinity
  • temperature
  • Life cycle
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