تأثیر جایگزینی زودهنگام غذای زنده با غذای خشک بر عملکرد لارو ماهی صبیتی (Sparidentex hasta)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی گروه شیلات دانشکدة منابع طبیعی دانشگاه تهران

2 دانشیارگروه شیلات دانشکدة منابع طبیعی دانشگاه تهران

3 استاد گروه بیوشیمی مرکز تحقیقات بیوشیمی و بیوفیزیک دانشگاه تهران

4 دکتری شیلات سازمان شیلات استان هرمزگان، بندرعباس

چکیده

در این مطالعه امکان جایگزینی زودهنگام غذای زنده با خشک از روز 25 (تیمار شاهد) به روز 18 (تیمار زودهنگام) پس از تفریخ و تأثیر آن در شاخص‌های رشد، نرخ بقا و کیفیت لارو ماهی صبیتی (Sparidentex hasta) بررسی شده است. برای اندازه‌گیری نرخ رشد تا پیش از آغاز آزمایش، نمونه‌برداری از لاروها در روزهای 0، 2، 4، 10، 14، 16 و 18 و بعد از آن در روزهای 25، 32 و 39 و برای نرخ بقا و هم‌جنس‌خواری و کیفیت لارو در روز 39 پس از تفریخ صورت گرفت. نتایج نشان داد با آن‌که نرخ رشد ویژه در فاصلة آغاز جایگزینی غذا تا انتهای دورة پرورش در تیمار شاهد نسبت به زودهنگام به شکل معنی‌داری (05/0> p) بیشتر است، اما در کل دورة پرورش بین دو تیمار تفاوت معنی‌داری (05/0< p) ندارد. نرخ رشد نسبی در تیمار شاهد با روندی یکسان، ولی در تیمار زودهنگام با روند افزایشی معنی‌دار (05/0> p) پیش می‌رود. جایگزینی زودهنگام تأثیر معنی‌داری در نرخ بقا و هم‌جنس‌خواری و کیفیت لاروها نداشت (05/0< p). این نتایج بیان‌گر امکان جایگزینی غذای زنده با خشک در لارو ماهی صبیتی از روز هجدهم پس از تفریخ بدون کاهش در نرخ رشد ویژه، نرخ بقا و کیفیت لارو است که برای پرورش‌دهنده نیز اقتصادی‌تر است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of early weaning on Sobaity Sea bream larvae performance (Sparidentex hasta)

نویسندگان [English]

  • Samira Nazemroaya 1
  • Mohammad Ali Nematollahi 2
  • Raziyeh Yazdanparast 3
  • Hamid Farahmand 2
  • Qodrat Mirzadeh 4
1 MSc. Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Professor, Department of Biochemistry, Institute of Biochemistry and Biophysics, University of Tehran, Iran
4 Ph.D. Fisheries Organization of Hormozgan, Bandar-e Abbas, Iran
چکیده [English]

In this study, the possibility of early weaning and its effect on growth, survival rate and quality of Sobaity Sea bream (Sparidentex hasta) larvae from 25 (control group) to 18 (treatment group) days post hatch (DPH) were investigated. For growth rate measurement, sampling was done prior to starting test on 0, 2, 4, 10, 14, 16, and 18, and afterward on 25, 32 and 39 DPH; and for survival rate, cannibalism rate and also larval quality on 39 day post hatch. The result showed that thought from the starting of weaning to the end of rearing, the Specific growth rate (SGR) was significantly higher in control group than early treatment (P<0.05), there was no significant difference on SGR between two treatments during the whole rearing period. Relative growth rate (RGR) did have the equal progress among sampling days in control treatment, but there was significant increased pattern in early treatment (P<0.05). Early weaning did not have significant effect on survival rate, cannibalism rate, and quality of larvae (P>0.05). These results showed that the early weaning of Sobaity Sea bream S. hasta larvae on 18DPH was possible without having undesirable affects on SGR, survival rate and quality loss which is more economic for farmer.

کلیدواژه‌ها [English]

  • Growth
  • Sparidentex hasta
  • sobaity sea bream
  • Survival
  • weaning
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