Growth performance of 7-g Anguilla bicolor bicolor at different density

Abstract

<p class="BasicParagraph" align="center"><strong>ABSTRACT</strong></p><p class="BasicParagraph" align="center"><strong> </strong></p><p class="Pa2">This research was conducted to evaluate the performance of eel production at stocking density of 2 g/L, 3 g/L, and 4 g/L reared in recirculating system for 60 days. The experimental design used was completely randomized design. Fish were fed on sinking pellet given according to body weight. Collected data were survival, specific growth rate, biomass growth, feed convertion ratio, weight variance, blood profile, blood glucose, and cortisol levels.The results showed that the best performance was found in 4 g/L density with specific growth rate and biomass growth were 0.99±0.30 and 7.50±4.13 g/day, feed conversion ratio of 1.22±0.58, and weight variance of 21.72±3.60%. Stress responses parameters which consisted of cortisol and blood glucose levels showed no significant difference at 22.45± 8.59 nm/L and 31.92± 4.29 mg/dL, respectively. Blood profile in form of hemoglobin, hematocrit, red blood cell and differential leukocytes showed no significant differences except for the leukocyte parameters with the highest rate was achieved at the stocking density of 4 g/L (2.70±0.001x105 sel/mm3). In conclusion, the stocking density of 4 g/L produced the best physiological and production performance.</p><p class="Default"> </p><p class="Default">Keywords: stocking density, growth, physiological response, eel, recirculation system</p><br /><p class="BasicParagraph"> </p><p class="BasicParagraph" align="center"><strong>ABSTRAK</strong></p><p class="BasicParagraph"><strong> </strong></p><p class="Pa2">Penelitian ini bertujuan untuk mengevaluasi kinerja produksi dan respons fisiologis ikan sidat pada padat tebar 2 g/L, 3 g/L, dan 4 g/L dalam sistem resirkulasi selama 60 hari. Rancangan percobaan yang digunakan adalah rancangan acak lengkap. Pakan berupa pelet tenggelam diberikan sesuai bobot tubuh. Data yang diambil meliputi kelangsungan hidup, laju pertumbuhan spesifik, laju pertumbuhan biomassa, konversi pakan, koefisien keragaman bobot, gambaran darah, kadar glukosa darah, dan kadar kortisol. Hasil penelitian menunjukkan bahwa padat tebar berpengaruh nyata (P<0,05) terhadap laju pertumbuhan biomassa; pertumbuhan biomassa terbaik dicapai pada kepadatan 4 g/L dengan laju pertumbuhan spesifik dan laju pertumbuhan biomassa sebesar 0,99±0,30 dan 7,50±4,13, konversi pakan sebesar 1,22±0,58, dan koefisien keragaman sebesar 21,72±3,60%. Parameter respons stres yaitu kadar kortisol dan glukosa darah tidak menunjukkan perbedaan yang nyata, yaitu masing-masing sebesar 22,45±8,59 nm/L serta 31,92±4,29mg/dL. Gambaran darah berupa hemoglobin, hematokrit, jumlah sel darah merah dan diferensial leukosit tidak menunjukkan perbedaan yang nyata (P>0,05), kecuali pada parameter leukosit dengan nilai terbaik pada perlakuan 4 g/L (2,70±0,001 x105 sel/mm3). Hasil penelitian menunjukkan bahwa padat tebar 4 g/L menghasilkan kinerja fisiologis dan produksi terbaik.</p><p class="Default"> </p>Kata kunci: padat tebar, pertumbuhan, respons fisiologis, ikan sidat, sistem resirkulasi

The effect of water level in vertical aquaculture systems on production performance, biochemistry, hematology, and histology of Anguilla bicolor bicolor

“…The results of this study are also better when compared to the cultivation of A. bicolor bicolor eels in the aquaponic system and phytoremediation using high water volume, the resulting SR value of 78–100%, the growth was 0.3–1.19% and the KP was 1.57–3.91 13 , 37 . Besides, the growth in this study is higher than that of the eel A. bicolor bicolor stadia elver reared in a water volume of 48–120 L indicating the values between 0.2 and 1.47% for its WSGR 10 , 11 , 13 , 38 and 0.8–3.48 g/day for its AGR 12 , 38 .…”

“…The WCD values in this study were still below 20%, indicating that the weight uniformity rate of the eel A. bicolor bicolor stadia elver at the end of the study was high 40 . This study has better results of the WCD values than the previous studies where the eels were reared in a water volume of 48–120 L with the WCD value ranging from 12 to 39% 10 – 12 . OCR functions as an indicator to determine the metabolic rate of fish 41 .…”

“…Water management in the container was performed by siphonize and changing the water. The waste of feed eliminated by siphoned off before feeding and water change (as much as 20% of water volume in the container) 10 is done twice a day (morning and evening).…”

“…This is because the use of volume and water depth is still high in the cultivation process. The breeding and rearing process of laboratory-scale eels with a regular aquarium using water depth and volume ranged from 20 to 35 cm 10 – 13 . Meanwhile, for the production scale with pond, the water level commonly used is between 50 and 200 cm 14 – 16 .…”

Optimization of stocking density in intensification of mud crab Scylla serrata cultivation in the resirculation system

“…One of the effects of stocking mud crab at high densities on production is the competition for feed and space that could lead to stress, which is a physiological response against adverse environmental conditions. Blood glucose level is a parameter that best describe physiological responses in animals when maintaining homeostasis during changes that occur around them (Harianto et al, 2014). The highest glucose level was observed at the beginning of the rearing period, indicating hyperglisemia (indicator for early stress), and progressively decreased, which indicated a decrease in stress throuought the rearing period.…”