ارزيابي و مقايسة تأثير جيرة آزمايشي با غذاهاي وارداتي و داخلي بر پاره اي از شاخص هاي رشد در قزل آلاي رنگين كمان(Oncorhynchus mykiss)

Valuation and comparison of a test diet effect with imported and an interior foods on some growth indicators for juvenile Rainbow trout (Oncorhynchus mykiss))

به منظور توليد يك جيرۀ غذايي مناسب براي پرورش ماهي قزل آلاي رنگين كمان (Oncorhynchus mykiss)، رقابت با غذا هاي وارداتي و بررسي امكان جايگزيني اين جيره به جاي آن ها، فرمولاسيون جديدي تدوين شد و با دو غذاي وارداتي، يكي از فرانسه (تيمار A) و ديگري از ايتاليا (تيمار B)، و يك غذاي داخلي (تيمار C) مقايسه گرديد. 600 عدد بچه ماهي قزل آلا با ميانگين وزن 3±37 گرم و طول 0/55±13/5 سانتي متر، طي دورۀ 127 روزه در 12 كانال پرورشي به ابعاد 80×150×440 سانتي متر، به صورت 4 تيمار كه هر يك داراي سه تكرار بودند، با استفاده از اين جيره ها پرورش يافتند. در پايان دوره، ميانگين وزن، طول كل و افزايش وزن بدن در تيمار فرموله با ساير تيمارها، داراي اختلاف معني دار بود (p<0/05)، كه به ترتيب تيمار فرموله با 12/13±133/14 گرم، 0/75±21 سانتي متر و 6/20±191/49 گرم، بيشترين و تيمار C با 81/11±108/02 گرم، 0/75±19/83 سانتي متر و 17/90±126/99 گرم، كمترين مقادير را داشتند. بالاترين درصد افزايش وزن بدن 31/18±450/40 درصد و نرخ رشد ويژه 0/05±1/77 گرم در تيمار فرموله بود كه با ساير تيمارها به جز تيمار A اختلاف معني دار داشت(p<0/05) و كمترين مقادير در تيمار C به ترتيب 54/01±299/51 درصد و 0/13±1/43 گرم بود. بيشترين ضريب سودمندي پروتئين در غذاي A 0/007±0/06 بود و با فرموله 0/001±0/042 اختلاف معني دار داشت (p<0/05). ضريب تبديل غذايي فرموله 0/12±0/92 با غذاهاي وارداتي اختلاف معني داري نداشت(05/0

In the purpose of produce a suitable diet for farming the Rainbow trout (Oncorhynchus mykiss), competition with imported foods and checking the possibility of replacement this diet with those ones, a new formulation codified and compared with two imported foods, one from France (A treatment) and the other from Italy (B treatment), and an interior food (C treatment). 600 fingerlings trout with the mean weight of 37±3 gr. and length of 13.5±5.5 cm. with duration of 127 days in 12 rearing channels with dimensions 440×150×80 cm., in 4 treatment, which one had 3 repeat, farmed using these diets. In the end of the term, means of weight, total length and weight gain had significant differences in formulated diet with others (P<0.05), sequencely formulated diet had the highest values with 133.14±12.13 gr. weight, 21±0.75 cm. length, and 191.49±6.20 gr. WG, and C had the least values with 108.02±11.81 gr. 19.83±0.75 cm. and 126.99±17.90 gr., Respectively. The maximum %WG 450.40±31.18 and SGR 1.77±0.05 gr. were also in formulated and the least were in C, sequencely 299.51±54.01 percent and 1.43±0.13 gr., that had significant differences with others (P<0.05), except for A. Maximum PER in A, 0.06±0.007 and formulated 0.042±0.001 had significant differences (P<0.05). FCR in formulated 0.92±0.12 had no significant differences with imported foods (P>0.05). Formulated chemical and anti nutritional factor analysis involved 55.59% protein, 10.64% lipid, 13.13% carbohydrate, 2.28% fiber, 9.79% ash, 8.55% moist and 3.14 mili eqi valan/1000 gr. diet peroxide. However, the amount of energy was less in formulated, 3706.4 kcal per kg diet than A, 4174.1 and B, 4063.1, despite of the presence of suitable composition caused the most growth. The energy of C 3663.8, was the least amount.Cheking sensory properties or Organolepthic Tests, the fish fed formulated diet valuated better than the others generally. Undoubted, producing this diet formulation will be more economize between other treatments. Total composition of formulated diet is not open at the time being.