رشد و قطر خار باله سینه ای بچه تاس ماهی ایرانی (Acipenser persicus) پرورشی جنوب دریای خزر

نوع مقاله: محیط زیست جانوری

نویسندگان

1 گروه زیست شناسی، دانشکده علوم پایه، دانشگاه گیلان، رشت، ایران

2 پژوهشکده حوضه آبی دریای خزر، دانشگاه گیلان، رشت، ایران

چکیده

 رشد و قطر خار باله سینه ­ای بچه تاس­ ماهی ایرانی (Acipenser persicus) پرورشیسایت­های جنوب ­شرقی و غربی دریای خزر پیش از رهاسازی به دریا بررسی گردید. پس از زیست­ سنجی بچه ماهیان، خار باله سینه ­ای سمت راست آن­ ها جدا گردید، وزن شد و اندازه آن­ ها ثبت گردید. هیچ تفاوت معنی ­داری در وزن و طول بچه ماهیان جنوب ­شرقی و غربی دریای خزر مشاهده نشد. شاخص چاقی هم تفاوت معنی­ داری بین دو منطقه نداشت (0/05<P). رابطه بین وزن بدن و وزن خار باله سینه ­ای در هر دو منطقه معنی­ دار بود. تفاوت معنی­ داری بین قطر مقطع خارهای باله سینه ­ای در دو ناحیه شرق و غرب وجود نداشت. منحنی رابطه میان طول با وزن بچه ماهیان به ­صورت ازلی بود، به گونه ­ای­ که بخش عمده رشد در روزهای ابتدایی زندگی مشاهده شد. این مطالعه نشان داد ویژگی ­های مشابه در رشد بچه تاس ­ماهیان ایرانی پرورشی نواحی جنوب­ شرقی و غربی دریای خزر وجود دارد که می ­تواند قبل از رهاسازی به دریا جهت شناخت شرایط آن­ ها برای اهداف حفاظتی مفید باشد.

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