fa بررسی تغییرات هم‌آوری لای‌ماهی (Linnaeus, 1758) Tinca tinca بر حسب سن، وزن و طول بدن در تالاب انزلی تخصصي Special پژوهشي Research <span style="font-size:12pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">مطالعه تغییرات هم&shy;آوری</span></span></span></span></b><b> </b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">مطلق و نسبی و قطر تخمک </span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">بر اساس طول، وزن و سن </span></span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">لای&shy;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">ماهی در تالاب انزلی </span></span></span></span></b><b><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">باهدف توسعه علم و کاربرد آن در تکثیر مصنوعی این ماهی صورت گرفت. بدین منظور تعداد 130 ماهی در </span></span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">اردیبهشت و خرداد 1402 از </span></span></span></b><b><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">تالاب انزلی صید گردید که 89 عدد مناسب برای تعیین هم&shy;آوری بودند. این ماهیان </span></span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">دارای وزن بدن 2/29 تا 214 گرم، طول کل 5/13 تا 5/22 سانتی&shy;متر و سن 4 تا 7 بودند و </span></span></span></b><b><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">نتایج نشان داد</span></span></span></span></b><b> </b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در تخمدان ماهیان بالغ، حداقل 3 دسته تخمک بزرگ، متوسط و کوچک مشاهده شد که میانگین&shy;های تعداد تخمک&shy;های دسته 1 حدود 6363</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">18479، مجموع تعداد تخمک&shy;های دسته ا و 2 حدود 8507</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">29500 و هم&shy;آوری مطلق سالانه یعنی مجموع سه دسته تخمک بزرگ، متوسط و کوچک حدود 14111</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">43318 عدد برآورد شد. همچنین میانگین هم&shy;آوری مطلق سالانه در سنین 4، 5، 6 و 7 سال به&shy;ترتیب 4828</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">28112، 7556</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">35660، 12408</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">46305 و&nbsp; 19171</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">60924 عدد تخمک محاسبه شد که میانگین آن با افزایش طول و وزن بدن ماهی نیز افزایش یافت. میانگین هم&shy;آوری نسبی دسته 1، مجموع هم&shy;آوری دستجات 1 و 2 و هم&shy;آوری نسبی سالانه (مجموع سه دسته تخمک) به&shy;ترتیب 38</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">194، 67</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">315 و 124</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">464 عدد تخمک در گرم وزن بدن محاسبه گردید. میانگین قطر تخمک&shy;های دستجات 1، 2 و 3 به&shy;ترتیب 12/0</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">95/0، 09/0</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">63/0 و 08/0</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span cambria="" style="font-family:">&plusmn;</span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">35/0 میلی&shy;متر در فصل تخمریزی تعیین شد. وجود 3 تا 4 دسته تخمک در تخمدان ماده&shy;ها در اوایل فصل تخمریزی نشان می&shy;دهد این گونه در تالاب انزلی چندین بار در فصل تولیدمثل، اقدام به تخم&shy;ریزی می&shy;نماید</span></span></span></b><b><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="layout-grid-mode:line">. </span></span></span></span></b><b><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span style="font-family:"B Nazanin""></span></span></span></b></span></span></span></span></span><br> <br> &nbsp; <span style="font-size:12pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:10.0pt"><span style="line-height:150%">The study of changes in absolute and relative </span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">fecundity </span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">and egg diameter based on the length, weight and age of tench, <i>Tinca tinca</i> in Anzali lagoon was carried out with the aim of developing the science and its application in the artificial propagation of this fish.</span></span> </b><b><span style="font-size:10.0pt"><span style="line-height:150%">For this purpose, 130 fish were caught from Anzali lagoon in May and June 2023, of which 89 were suitable for determining the </span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">fecundity</span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">. These fish had a body weight of 29.2 to 214 ^g, a total length of 13.5 to 22.5 ^cm, and an age of 4 to 7 years. The results showed that in the ovaries of adult fish, at least 3 categories or batches of large, medium and small eggs were observed, and the average number of eggs in batch 1 was 18479&plusmn;6363, the total number of eggs in batch 1-2 was 29500&plusmn;8507, and the annual absolute </span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">fecundity</span></span></b><b><span style="font-size:10.0pt"><span style="line-height:150%">, i.e. the sum of the 3 batches of large, medium and small eggs, was estimated to be 43318 &plusmn; 14111. Also, the average annual absolute fecundity of eggs at the ages of 4, 5, 6 and 7 years was calculated as 28112&plusmn;4828, 35660&plusmn;7556, 46305&plusmn;12408, and 60924&plusmn;19171 eggs, respectively, and the average with the increase in the length and body weight of the fish increased. The average of the relative fecundity of the 1st batch, the total of the fecundity of the batches 1-2 and the annual relative fecundity (the total of the three batches of eggs) were calculated as 194&plusmn;38, 315&plusmn;67 and 464&plusmn;124 eggs per gram of body weight, respectively. The average diameter of the eggs of batches 1, 2 and 3 was determined as 0.95&plusmn;0.12, 0.63&plusmn;0.09 and 0.35&plusmn;0.08 ^mm respectively in the spawning season. The presence of 3 to 4 batches of eggs in the ovaries of females at the beginning of the spawning season shows that this species spawns several times in the breeding season in Anzali wetland.</span></span></b></span></span></span></span>&nbsp; Tinca tinca, لای‌ماهی, تولیدمثل, تخم‌ریزی, دریای کاسپین Tinca tinca, tench, Reproduction, spawning, Caspian Sea 41 50 http://jair.gonbad.ac.ir/browse.php?a_code=A-10-46-7&slc_lang=fa&sid=1 Keyvan Abbasi Ranjbar کیوان عباسی رنجبر keyvan_abbasi@yahoo.com 10031947532846009205 10031947532846009205 Yes Iranian Fisheries Sciences Research Institute موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی Alinaghi Sarpanah علینقی سرپناه sarpanah5050@gmail.com 10031947532846009206 10031947532846009206 No Iranian Fisheries Sciences Research Institute موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی