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تأثیر جایگزینی زودهنگام غذای زنده با غذای خشک بر عملکرد لارو ماهی صبیتی (Sparidentex hasta) | ||
| شیلات | ||
| مقاله 12، دوره 68، شماره 2، تیر 1394، صفحه 313-328 اصل مقاله (829.57 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jfisheries.2015.55122 | ||
| نویسندگان | ||
| سمیرا ناظم رعایا1؛ محمدعلی نعمت اللهی* 2؛ راضیه یزدان پرست3؛ حمید فرحمند2؛ قدرت میرزاده4 | ||
| 1دانشجوی گروه شیلات دانشکدة منابع طبیعی دانشگاه تهران | ||
| 2دانشیارگروه شیلات دانشکدة منابع طبیعی دانشگاه تهران | ||
| 3استاد گروه بیوشیمی مرکز تحقیقات بیوشیمی و بیوفیزیک دانشگاه تهران | ||
| 4دکتری 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 | ||
| صبیتی؛ Sparidentex hasta؛ جایگزینی غذا؛ رشد؛ بقا | ||
| عنوان مقاله [English] | ||
| Effect of early weaning on Sobaity Sea bream larvae performance (Sparidentex hasta) | ||
| نویسندگان [English] | ||
| Samira Nazemroaya1؛ Mohammad Ali Nematollahi2؛ Raziyeh Yazdanparast3؛ Hamid Farahmand2؛ Qodrat Mirzadeh4 | ||
| 1MSc. Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 3Professor, Department of Biochemistry, Institute of Biochemistry and Biophysics, University of Tehran, Iran | ||
| 4Ph.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 | ||
| مراجع | ||
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