مجله علوم آبزی پروری

مجله علوم آبزی پروری

برآورد توان تولید ماهی و وضعیت تروفی دریاچه سد درودزن (استان فارس) بر پایه‌ مدل‌های تجربی لیمنولوژیک

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه شیلات و آبزیان، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی فارس، سازمان تحقیقات، آموزش و ترویج کشاورزی، فارس، ایران.
چکیده
دریاچه‌ سدها، اکوسیستم‌های نیمه‌طبیعی با پتانسیل بالای تولید ماهیاند، اما بهره‌برداری پایدار از آنها نیازمند شناخت دقیق وضعیت تروفی و توان تولید طبیعی است. این پژوهش با هدف ارزیابی وضعیت تروفی، تولید اولیه و توان تولید ماهی در دریاچه سد دُرودزَن (استان فارس) انجام شد. نمونه‌برداری فصلی برای سنجش اکسیژن محلول، دما، شفافیت، فسفرکل و کلروفیل‑آ در سه برش عرضی (رودخانه‌ایی، گذرنده و دریاچه‌ایی) و سه ناحیه (ساحلی، سطحی و زیرسطحی) در سال ۱۴۰۴ انجام شد. وضعیت تروفی دریاچه با شاخص کارلسون (TSI)، تولید اولیه با مدلBraemick‑Lemcke ، و توان تولید ماهی با مدل‌های Braemick‑Lemcke (بر پایه‌ تولید اولیه) و Downing (بر پایه‌ فسفرکل) برآورد شد. میانگین سالانه‌ اکسیژن محلول mg/L ۵۵/۷، شفافیت m 2/45، فسفرکل mg/L 0/17 و کلروفیل‑آµg/L 1/6 اندازه‌گیری شد. فسفرکل در بخش رودخانه ا‌یی بیش‌تر از بخش دریاچه‌ا‌‌یی بود و نقش مهمی در غنی‌شدن دریاچه داشت. میانگین شاخص تروفی کارلسون 53/13 (یوتروفیک)، تولید اولیه gC.m-2.y-1 288/59 و توان تولید ماهی Kg.ha-1.y-1 34/97محاسبه شد. با در نظر گرفتن ۳۰۰۰ هکتار سطح زیست‌پذیر، تولید پایدار سالانه‌ ماهی حدود ۱۰۵ تن و برداشت مجاز ۱۹ تا ۲۹ تن به‌دست آمد. با اعمال عدم‌قطعیت مدل (بازه 95/0 در شبیه‌سازی مونت‌ِکارلو)، تولید سالانه در بازه‌ ۸۰ تا ۱۳۰ تن و اندازه‌ نقطه‌ا‌‌یی زی‌توده ماهیان در بازه‌ 151 تا 237 تن برآورد شد که با گزینش محافظه‌کارانه کران پایینی، برداشت مجاز سالانه 15/1 تا 22/7 تن پیشنهاد می‌شود. این یافته‌ها بر ضرورت مهار ورود فسفر از آب‌خیز بالادست، پایش مستمر جمعیت ماهیان و مدیریت علمی بهره‌برداری از ذخیره‌های آبزیان تاکید دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Estimation of fish production potential and trophic state of the Dorudzan reservoir (Fars Province) based on empirical limnological models

نویسندگان English

Mehrdad Zamanpoore
Fatemeh Sedaghat
Agricultural Research, Education and Extension Organization, Fars Agricultural and Natural Resources Research and Education Center, Fars, Iran.
چکیده English

Reservoirs are semi-natural ecosystems with high potential for fish production; however, sustainable exploitation requires accurate knowledge of trophic state and natural productivity. This study evaluated the trophic state, primary production, and fish production potential of Dorudzan reservoir. Seasonal sampling was conducted in 2025 to measure dissolved oxygen (O₂), temperature (Temp), Secchi depth (SD), total phosphorus (TP), and chlorophyll‑a (Chl‑a). Samples were collected from three transverse sections (riverine, transitional, and lacustrine zones) and three areas (littoral, surface, and subsurface zones). Trophic state was assessed using Carlson's Trophic State Index (TSI); primary production according to the Braemick‑Lemcke model, and fish production potential using the Braemick‑Lemcke (based on primary production) and Downing (TP‑based) models. Annual mean values of O₂, SD, TP, and Chl‑a were 7.55 mg/L, 2.45 m, 0.17 mg/L, and 1.60 µg/L, respectively. TP was higher in the riverine zone, indicating its key role in reservoir enrichment. The mean TSI of 53.13 indicated eutrophic conditions. Mean primary production and fish production potential were estimated at 288.59 gC·m⁻²·y⁻¹ and 34.97 kg·ha⁻¹·y⁻¹, respectively. Considering 3,000 ha of habitable area, sustainable fish yield was ~105 t, with a permissible catch of 19–29 t. Incorporating model uncertainty (95% Monte Carlo), annual yield ranged from 80–130 t and fish biomass point estimate ranged from 151–237 t. Adopting a conservative lower‑bound approach, we recommend a permissible annual catch of 15.1–22.7 t. These findings emphasize the need to control phosphorus input from the upstream catchment, continuously monitor fish populations, and implement science‑based management of aquatic resources.

کلیدواژه‌ها English

">Carlson Trophic State Index, Primary production, ">Fish production potential, Total phosphorus.
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