PENINGKATAN PERTUMBUHAN DAN SINTASAN BENIH IKAN TUNA SIRIP KUNING, Thunnus albacares DALAM PENDEDERAN SISTEM INDOOR

Sintasan larva hingga benih ikan tuna sirip kuning di hatchery sudah meningkat dari 0,05% menjadi 0,20%-0,50%. Namun mortalitas pada pemeliharaan tahap berikutnya sangat tinggi. Kematian benih karena menabrak dinding bak/jaring, berkaitan dengan kebiasaan renang dan kondisi lingkungan. Oleh karena itu, riset pendederan ini difokuskan pada pengamatan kebiasaan berenang dan pemangsaan, serta kondisi lingkungan. Wadah yang digunakan adalah enam buah bak fiberglass reinforced plastic (FRP) diameter 2,7 m; ketinggian 1,0 m; dan diisi dengan air laut 5 m3. Hewan uji berupa benih ikan tuna sirip kuning dengan panjang total 29,82 ± 2,51 mm hasil produksi dari hatchery, sebanyak 50 ekor benih per bak. Perlakuan dalam riset adalah perbedaan sistem pemeliharaan, yaitu: (A) indoor dan (B) outdoor dengan tiga ulangan dan lama penelitian 21 hari. Pakan yang digunakan adalah ikan segar berupa benih bandeng yang dimatikan dan ikan teri dengan panjang total 15-25 mm dan ikan cincang (minced fish). Frekuensi pemberian pakan adalah enam kali per hari dan diberikan secara satiasi. Parameter meliputi suhu, oksigen terlarut, dan intensitas cahaya diukur setiap hari. Hasil riset menunjukkan bahwa sintasan dalam pendederan sistem indoor sebesar 20,0 ± 4,0% lebih tinggi (P<0,05) dibanding dengan sistem outdoor (6,7 ± 5,0%). Pertumbuhan bobot spesifik 12,4% hari-1 pada sistem indoor lebih baik dibandingkan sistem outdoor yang hanya 9,8% hari-1 (P<0,05). Dari hasil penelitian ini dapat disimpulkan bahwa intensitas cahaya dan suhu yang lebih stabil pada pendederan sistem indoor memberikan sintasan dan pertumbuhan yang lebih baik dibandingkan pada sistem outdoor. Namun demikian, disarankan bahwa pendederan dalam bak FRP sebaiknya tidak lebih dari dua minggu agar diperoleh sintasan yang lebih tinggi dan selanjutnya dipindahkan ke karamba jaring apung (KJA).The survival rate of reared yellowfin tuna from larvae to juvenile stages in hatchery has been improved from 0.05% to 0.20%-0.50%. Unfortunately, the fish’s mortality rate during the nursery phase is still very high. Unpredicted swimming and feeding behaviors have resulted the reared juveniles to uncontrollably hit the tank wall and died. Therefore, this research was carried out to study the swimming and feeding habits of yellowfin tuna juveniles and its response to different rearing environments. Six fiberglass reinforced plastic (FRP) tanks with a diameter of 2.7 m, height 1.0 m, and filled with 5 m3 of filtered sea water were used in the study. Yellowfin tuna juveniles with an average total length of 29.82 ± 2.51 mm were harvested from a hatchery and placed into each tank at a density of 50 fish tank-1. The treatments applied were two nursery systems: (A) indoor and (B) outdoor system with three replicates. The rearing treatment lasted for 21 days. Raw fish was given as feed consisting of mixed of defrosted milkfish fry and small anchovy with total length ranged between 15-25 mm as well as minced fish meat. Feed was given six times per day at satiation. The observed parameters were temperature, dissolved oxygen, and light intensity measured daily. The results showed that the survival rate of juvenile in the indoor system was 20.0 ± 4.0%, which was higher (P<0.05) than that of the outdoor system (6.7 ± 5.0%). Weight specific growth rate of fish reared in the indoor system was 12.4% day-1 which was better than that of the outdoor system which was only 9.8% day-1 (P<0.05). This research concludes that a stable light intensity and water temperature in the indoor nursery system gives better survival and growth rate on yellowfin tuna juvenile. Nevertheless, this research recommends that the nursery phase of yellowfin tuna juvenile in FRP tank should be carried out not more than two weeks in order to produce a higher survival rate and then transferred to floating net cages.

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The Effect of Different Thyroxine Hormone (T4) Concentration on The Growth, Survival, and Pigment Development of Pink Zebra Fish Larvae (Brachydanio reiro)

Omni-Akuatika ◽

10.20884/1.oa.2018.14.2.538 ◽

2018 ◽

Vol 14 (2) ◽

Author(s):

Arifianto Heraedi ◽

Slamet Budi Prayitno ◽

Tristiana Yuniarti

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Specific Growth Rate ◽

Specific Growth ◽

Fish Larvae ◽

Average Length ◽

Average Weight ◽

Zebra Fish ◽

Total Length ◽

Absolute Growth

The thyroxin hormone plays an important role in the process of metabolism, yolk sac absorbsion, and growth of fish. The aims of this research were to observe the effect of various concentration of thyroxin (T4) on the absolute growth weight, total length, survival rate, and pigment development of pink zebra fish larvae (Brachydanio reiro ) after being reared 42 days. The pink zebra fish larvae at 4 day age with the average weight of 0,002 – 0,003g and average length of ± 3.10 – 3.43 mm were immersed at various concentration of T4 for 24 hours. Prior the treatment fish larvae were dipped into 1 ppt salinity for 2 minutes then transferred into 1 Liter, 1ppt saline and various T4 in plastic bags. The thyroxin concentrations were A (0 mg / L); B (0.05 mg / L); C (0.10 mg / L) and D (0.15 mg / L) respectively. The stocking density was 40 fish/L. After that they were transferred into aquariums and reared for 42 days. Completely Randomized Design (RAL) with four treatments and three replications were used. The variables observed were absolute and specific growth, total length, survival rate and hue degree. The results showed that the thyroxin hormone had significant effect on absolute growth weight, total length and specific growth rate. The dosage 0.1 mg/L was the best treatment on absolute growth, total length, and specific growth rate. Whilee the survival rate showed no significant differences across the treatments. Treatment C also demonstrated the best ppigment development (14.60 + 0.36º hue) compared to others.

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PEMELIHARAAN LARVA ABALON Haliotis squamata DENGAN PEMBERIAN JENIS PAKAN BERBEDA DALAM BENTUK TEPUNG

Jurnal Riset Akuakultur ◽

10.15578/jra.13.1.2018.39-46 ◽

2018 ◽

Vol 13 (1) ◽

pp. 39

Author(s):

Fitriyah Husnul Khotimah ◽

Gusti Ngurah Permana ◽

Ibnu Rusdi ◽

Bambang Susanto

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Seed Production ◽

Shell Length ◽

Sea Water ◽

Feed Solution ◽

Larval Rearing ◽

Daily Growth Rate ◽

Daily Growth ◽

Survival And Growth

Masalah utama yang umum terjadi pada produksi benih abalon adalah kematian yang tinggi (> 90%) setelah abalon menempel pada plate pemeliharaan. Penggunaan pakan dalam bentuk tepung untuk mengganti diatom sebagai pakan postlarva beberapa spesies ikan, udang, dan abalon sudah dilakukan. Penelitian ini bertujuan untuk mendapatkan jenis pakan dalam bentuk tepung yang sesuai dan efektif untuk mendukung sintasan dan pertumbuhan larva abalon Haliotis squamata. Percobaan terdiri atas lima perlakuan pakan pada pemeliharaan larva abalon yaitu tepung Spirulina sp., Ulva sp., Chaetoceros sp., Gracilaria sp., dan diatom (kontrol). Masing-masing perlakuan terdiri atas empat ulangan. Pakan berupa tepung yang digunakan pada masing-masing perlakuan, terlebih dahulu dicampur merata dengan larutan tepung agar (7,5 mg/mL dalam air laut; suhu 40°C) dengan konsentrasi tepung 40 mg/mL larutan agar. Pemberian pakan dilakukan setiap tiga hari dengan cara menyemprotkan larutan pakan pada permukaan plate pemeliharaan larva. Penelitian dilakukan selama 30 hari. Hasil penelitian menunjukkan bahwa sintasan larva abalon yang diberi pakan tepung Spirulina sp. paling tinggi dan berbeda nyata (P<0,05) dengan yang diberi diatom, tepung Chaetoceros sp., dan Ulva sp., yaitu masing-masing 81,49%; 79,25%; 76,57%; dan 76,46%; tetapi tidak berbeda nyata dengan yang diberi pakan tepung Gracilaria sp. 81,37% (P>0,05). Laju pertumbuhan harian panjang cangkang larva abalon tertinggi diperoleh pada larva yang diberi pakan tepung Gracilaria sp. (203,81 ± 1,23 µm/hari) dan Spirulina sp. (205,59 ± 1,71 µm/hari). Nilai laju pertumbuhan harian panjang cangkang larva abalon yang paling rendah dijumpai pada larva yang diberi pakan tepung Ulva sp. (146,07 ± 1,73 µm/hari).The most common problem in abalone seed production is the high mortality occurrence (> 90%) after postlarvae settlement to the rearing plates. The use of microparticle diets to replace the natural feed of postlarval has been performed on various species of fish, shrimp, and abalone. This research aims to determine the most effective and suitable powder-based feed to support the survival and growth of abalone Haliotis squamata larvae. The experiments consisted of five feed treatments, i.e., Spirulina sp., Ulva sp., Chaetoceros sp., and Gracilaria sp. Flour, and diatoms (as control). Each treatment had four replicates. The powder-based feed used in each treatment was firstly mixed with a solution of agar powder (7.5 mg/mL sea water, 40°C) with a concentration of 40 mg of flour/mL of agar solution. Feeding was done every three days by spraying the feed solution onto the surface of the larval rearing plate. The study was conducted for 30 days. The results showed that survival rate of abalone larvae fed with Spirulina sp. flour was the highest and significantly different (P<0.05) compared with those given diatoms, Chaetoceros sp. and Ulva sp. flours, which were 81.49%, 79.25%, 76.57%, and 76.46%, respectively, and not significantly different from those fed with Gracilaria sp. 81.37% (P>0.05). The highest daily growth rate of the shell length of abalone larvae was achieved by larvae fed with Gracilaria sp. (203.81 ± 1.23 ¼m/day) and Spirulina sp. flours (205.47 ± 1.71 µm/day). The lowest daily growth rate of shell length was found on abalone larvae fed with Ulva sp. flour (146.07 ± 1.73 µm/day).

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Growth of tiger shrimp Penaeus monodon post-larvae fed on Artemia containing Vibrio SKT-b probiotic

Jurnal Akuakultur Indonesia ◽

10.19027/jai.12.79-85 ◽

2014 ◽

Vol 12 (1) ◽

pp. 79 ◽

Cited By ~ 1

Author(s):

. Widanarni ◽

Yani Hadiroseyani ◽

Asri Sutanti

Keyword(s):

Growth Rate ◽

Body Weight ◽

Survival Rate ◽

Sea Water ◽

Penaeus Monodon ◽

Environmentally Friendly ◽

Probiotic Bacteria ◽

Growth And Survival ◽

Tiger Shrimp ◽

Shrimp Production

ABSTRACT Application of probiotic bacteria is an alternative technology to increase shrimp production in an environmentally friendly aquaculture. Administration of probiotic bacteria can be conducted through artificial feed or live food such as Artemia. This study was done to examine the effectiveness of various doses of probiotic Vibrio SKT-b through Artemia on the growth and survival of post-larval shrimp. Tiger shrimp at a stage of PL 10 was reared in glass jars filled with 2 L of sea water at a density of 10 larva/L. The study consisted of five probiotic concentrations control (0 cfu/mL), A (103 cfu/mL), B (104 cfu/mL), C (105 cfu/mL), and D (106 cfu/mL). Administration of various doses of probiotic bacteria Vibrio SKT-b through Artemia significantly increased the growth rate in term of the length and weight, but had no effect on survival. The results found that treatment D (106 cfu/mL) gave an increase in body weight, length and survival rate of 22.53%/day, 0.080 cm/day and 95%, respectively. Keywords: probiotic, Artemia, tiger shrimp ABSTRAK Aplikasi bakteri probiotik merupakan salah satu alternatif teknologi untuk meningkatkan produksi budidaya udang yang ramah lingkungan. Pemberian bakteri probiotik dapat dilakukan melalui pakan buatan atau pakan alami seperti Artemia. Penelitian ini bertujuan untuk menguji efektivitas pemberian berbagai dosis bakteri probiotik Vibrio SKT-b melalui Artemia terhadap pertumbuhan dan kelangsungan hidup pascalarva udang windu. Stadia udang windu yang digunakan adalah pascalarva (PL) 10. Udang dipelihara dalam wadah kaca volume 3 L yang diisi air laut 2 L dengan kepadatan 10 ekor/L. Penelitian ini terdiri atas lima perlakuan yaitu kontrol (dosis bakteri probiotik 0 cfu/mL), A (103 cfu/mL), B (104 cfu/mL), C (105 cfu/mL), dan D (106 cfu/mL). Hasil penelitian menunjukkan bahwa pemberian berbagai dosis bakteri probiotik Vibrio SKT-b melalui Artemia berpengaruh nyata terhadap laju pertumbuhan panjang dan bobot, namun tidak berpengaruh terhadap nilai kelangsungan hidup. Hasil terbaik diperoleh pada perlakuan D (106 cfu/mL) dengan pertumbuhan bobot 22,53%/hari, pertumbuhan panjang 0,08 cm/hari, dan sintasan 95%. Kata kunci: probiotik, Artemia, udang windu

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GROWTH AND BLOOD PROFILE OF CORAL TROUT GROUPER Plectropomus leopardus SEEDS IN DIFFERENT SALINITIES

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v9i2.19290 ◽

2018 ◽

Vol 9 (2) ◽

pp. 557-568

Author(s):

Ketut Maha Setiawati ◽

Ketut Mahardika ◽

A. A. Ketut Alit ◽

Daniar Kusumawati ◽

Indah Mastuti

Keyword(s):

Body Weight ◽

Survival Rate ◽

Sea Water ◽

Feed Conversion ◽

Blood Profile ◽

Total Length ◽

Coral Trout ◽

Water Replacement ◽

Plectropomus Leopardus ◽

Optimum Salinity

The information about the optimum and tolerable salinity to support in the success of coral trout grouper’s seed culture is still limited until now. The aim of this study was to understand the effect of different salinity on growth, survival, feed conversion (FCR) and the profile of blood (hematocrit and hemoglobin) of coral trout grouper seed. The seed with total length 6.0 ± 0.5 cm and body weight 3.2±0.3 g were used as tested animals. Five different salinity treatments, namely: 10±1 ppt (A), 16±1 ppt (B), 22±1 ppt (C), 28±1 ppt (D), and the sea water (34 ppt) as a control (E) were undertaken in this study, with three replications for each treatment. Salinity values were reach by adding freshwater into the tested seawater. Water changing system in this study was performed in recirculation process, with 25% of water replacement every 7 days. The result of this study showed that the survival rate values were 100% for all treatments, indicating that coral trout grouper seed can be cultured in the range of salinity between 10 to 34 ppt. The highest total length and body weight were recorded from treatment C (22 ppt), as well as noted to gain the lowest FCR. Correspondingly, the seed in treatment C also founded to have in the greatest amount of hematocrit and hemoglobin. Optimum salinity for rearing of coral trout grouper seeds with total length 6 cm was 22 ppt. Keywords: salinity, growth, survival rate, feed conversion, blood profile

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EVALUASI PENGGUNAAN JENIS SELTER BERBEDA TERHADAP RESPONS STRES DAN KINERJA PRODUKSI PENDEDERAN LOBSTER AIR TAWAR Cherax quadricarinatus DALAM SISTEM RESIRKULASI

Jurnal Riset Akuakultur ◽

10.15578/jra.13.4.2018.297-307 ◽

2019 ◽

Vol 13 (4) ◽

pp. 297

Author(s):

Arif Faisal Siburian ◽

Kukuh Nirmala ◽

Eddy Supriyono

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Stress Responses ◽

Production Performance ◽

Average Weight ◽

Total Biomass ◽

Freshwater Crayfish ◽

Feed Conversion ◽

Cherax Quadricarinatus ◽

Total Length

Sintasan yang rendah pada pembenihan lobster air tawar tidak terlepas dari karakteristik lobster air tawar yang teritorial pada areal yang terbatas, sering menunjukkan sifat agresif pada umur muda, dan memiliki perilaku kanibalisme. Tujuan dari penelitian ini adalah mengevaluasi pengaruh penggunaan selter yang berbeda terhadap respons stres dan kinerja produksi sehingga dapat menentukan jenis selter yang tepat untuk pendederan lobster air tawar Cherax quadricarinatus. Penelitian ini menggunakan rancangan acak lengkap dengan empat perlakuan dan tiga ulangan. Perlakuan pada penelitian ini adalah penggunaan selter yang berbeda yakni pipa PVC, roster (ventilasi blok), tali rafia, dan tanpa selter (kontrol). Benih lobster air tawar yang digunakan memiliki bobot rata-rata awal berkisar antara 0,60±0,09-0,64±0,02 g dan panjang total rata-rata awal berkisar antara 2,55±0,06-2,61±0,03 cm yang dipelihara dalam sistem resirkulasi selama 60 hari. Perlakuan dengan penggunaan selter ataupun tanpa selter (kontrol) tidak memberikan pengaruh signifikan (P>0,05) terhadap respons stres, namun memberikan pengaruh signifikan (P<0,05) pada kinerja produksi benih lobster air tawar di akhir penelitian. Perlakuan terbaik pada penelitian ini adalah penggunaan selter tali rafia dengan kadar glukosa sebesar 101,00±17,35 mg/dL; protein total sebesar 5,00±0,36 g/dL; sintasan sebesar 86,67± 0,00%; bobot rata-rata akhir sebesar 2,86-3,46 g; panjang total rata-rata akhir sebesar 4,47-5,08 cm; laju pertumbuhan bobot spesifik sebesar 2,92±0,21%/hari; laju pertumbuhan panjang spesifik sebesar 1,15±0,08%/hari; rasio konversi pakan sebesar 2,97±0,05; dan biomassa total sebesar 45,02±1,10 g. Penggunaan tali rafia sebagai selter menjadi perlakuan yang terbaik karena kemampuan tali rafia memisahkan banyak individu sehingga dapat mengurangi kanibalisme dengan cara meminimalkan kontak antarbenih lobster air tawar.The low survival rate in seed production of freshwater crayfish is mainly caused by the territorial behavior of freshwater crayfish which leads to aggressiveness and cannibalism behavior even at a young age. This research aimed to determine the effect of using different nursery shelters on stress responses and production performance of freshwater crayfish Cherax quadricarinatus. This research used a completely randomized design consisted of four treatments, each with triplicate. The treatments used were different shelters made from PVC pipes, ventilation blocks, raffia ropes, and no shelters as controls. The freshwater crayfish seeds had initial weights ranged from 0.60±0.09-0.64±0.02 g, and total length ranged from 2.55±0.06-2.61±0.03 and reared in a recirculation system for 60 days. The results of the research showed that all treatments including controls did not have a significant effect (P>0.05) on stress responses but had a significant effect (P<0.05) on the production performance of freshwater crayfish seed at the end of this research. The seeds reared with raffia ropes shelter had the best production performance indicated by its glucose level of 101.00±17.35 mg dL1, total protein level of 5.00±0.36 g dL1, survival rate of 86.67 ± 0.00%, final average weight of 3.46 ± 0.08 g, final average total length of 5.08 ± 0.12 cm, specific weight growth rate of 2.92±0.21% per day, specific length growth rate of 1.15± 0.08% per day, feed conversion ratio of 2.97±0.05, and total biomass of 45.02±1.10 g. The use of raffia ropes is considered as the best shelter for freshwater crayfish seed as it provides more space to separate individual seeds which can reduce cannibalism behaviour due to minimum contact between individual seeds.

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KERAGAAN PERTUMBUHAN DAN WARNA IKAN WILD BETTA (Betta sp.) DENGAN REKAYASA INTENSITAS CAHAYA DAN WARNA LATAR

Jurnal Riset Akuakultur ◽

10.15578/jra.11.2.2016.153-162 ◽

2016 ◽

Vol 11 (2) ◽

pp. 153

Author(s):

Riani Rahmawati ◽

Sawung Cindelaras ◽

Eni Kusrini

Keyword(s):

Growth Rate ◽

Survival Rate ◽

Light Intensity ◽

White Background ◽

Rearing Environment ◽

Black Background ◽

Color Quality ◽

Light Intensities ◽

Ad Libitum ◽

Blue Background

Penelitian ini dilakukan untuk menguji pengaruh kondisi lingkungan dengan intensitas cahaya dan warna latar yang berbeda terhadap pertumbuhan dan warna ikan cupang (Betta sp.). Biota uji diberi kombinasi perlakuan perbedaan kondisi cahaya dan warna latar, yaitu: (A-1) 100 lux dan latar putih; (A-2) 100 lux dan latar hitam; (A-3) 100 lux dan latar biru; (B-1) 800 lux dan latar putih; (B-2) 800 lux dan latar hitam; (B-3) 800 lux dan latar biru; (C-1) 1.500 lux dan latar putih; (C-2) 1.500 lux dan latar hitam; dan (C-3) 1.500 Lux dan latar biru. Setiap perlakuan diulang tiga kali. Ikan diberikan pakan berupa larva Chironomus sp. secara ad libitum. Penelitian dilakukan selama 84 hari. Hasil terbaik diperoleh pada perlakuan A-1 (intensitas 100 lux dan latar putih), dengan laju pertumbuhan spesifik panjang dan bobot masing-masing sebesar 0,48 ± 0,06%/hari dan 0,75 ± 0,22%/hari; sintasan sebesar 100%, serta persentase perubahan hue (H), saturation (S), dan brightness (B) berturut-turut adalah 21 ± 18, 6 ± 10, dan 6 ± 18.This research was conducted to determine the effect of rearing environment and light intensity with different background coloration to improve the color quality and growth of wild betta fish (Betta sp.). The fishs which were placed in the small tanks and treated with different light intensities and background coloration. The treatments combinations were: (A-1) 100 lux and white background, (A-2) 100 lux and black background, (A-3) 100 lux and blue background, (B-1) 800 lux and white background, (B-2) 800 lux and black background, (B-3) 800 lux and black background, (C-1) 1,500 lux and white background, (C-2) 1,500 lux and black background, and (C-3) 1,500 lux and blue background. Each treatment was repeated three times. The fish were fed onfrozen Chironomus larvae twice a day. The research was conducted for 84 days. The result showed that the combination of 100 lux and white background resulted the best growth rate (0.48 ± 0.06 cm/day in length and 0.75 ± 0.22%/day in weight) and survival rate of 100%. The best combination had the value of hue (21 ± 18), saturation (6 ± 10), and brightness (6 ± 18).

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The Effectiveness of Candidate Probiotic Bacteria to Control Vibriosis Disease

Aquatic Science and Technology ◽

10.5296/ast.v5i2.11594 ◽

2017 ◽

Vol 5 (2) ◽

pp. 1

Author(s):

Mulyati Mulyati ◽

Suryati Suryati ◽

Irfani Baga

Keyword(s):

Survival Rate ◽

Sea Water ◽

Challenge Test ◽

Probiotic Bacteria ◽

Pathogenicity Test ◽

Inhibitory Ability ◽

Significant Difference ◽

Portunid Crab

The study aims to isolate, characterize, and examine probiotic bacteria's inhibitory ability against Vibrio harveyi bacteria, both in-vitro and in vivo. Methods used in the study consist of 1) An Isolation of Candidate Probiotic Bacteria, 2) An Antagonistic Test of Candidate Probiotic Bacteria in vitro, 3) An Identification of Bacteria, 4) A Pathogenicity Test of Candidate Probiotic Bacteria, 5) An Antagonistic Test of Candidate Probiotic Bacteria against V. harveyi in vivo. According to the isolation of candidate probiotic bacteria, there are 18 isolated candidate probiotic. After being tested for its inhibitory ability in vitro, there are 8 isolates with zone of inhibition as follows: isolate MM 7 from intestine (22 mm), isolate MM 6 from intestine (12 mm), isolate MM 10 from sea water (10 mm), isolate MM 5 from intestine (9 mm), isolate MM 4 from intestine (8 mm), isolate MM 3 from intestine (7 mm), isolate MM 2.2 from intestine (7 mm), isolate MM 2.1 from intestine (7 mm). Eight genera of the candidate probiotic bacteria is derived from Portunid crab, they are Staphylococcus, Streptococcus, bacillus, vibrio, Alcaligenes, Lactobacillus, micrococcus. Before proceeding the V. harveyi bacterial challenge test in vivo, three potential isolates consisting of MM6, MM7 and MM10 as the probiotic bacteria are pathogenicity-tested against V. harveyi. The survival rate of Portunid crab on pathogenicity test using MM6, MM7 and MM10 generates 91.11-100%, while the control generates 100% survival rate. Variance analysis result through post-hoc Tukey's Honest Significant Difference (HSD) test at 95% confidence interval indicates that isolate MM7 and MM10 are significantly able to increase hatchling Portunid crab's survival rate.

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Effect of Light Intensity and Quality on Growth Rate and Composition of Chlorella vulgaris

Plants ◽

10.3390/plants9010031 ◽

2019 ◽

Vol 9 (1) ◽

pp. 31 ◽

Cited By ~ 2

Author(s):

Maria N. Metsoviti ◽

George Papapolymerou ◽

Ioannis T. Karapanagiotidis ◽

Nikolaos Katsoulas

Keyword(s):

Growth Rate ◽

Light Intensity ◽

Chlorella Vulgaris ◽

Lipid Content ◽

Growth Rates ◽

Solar Irradiance ◽

White Led ◽

Microalgal Biomass ◽

Nm Range ◽

Effect Of Light

In this research, the effect of solar irradiance on Chlorella vulgaris cultivated in open bioreactors under greenhouse conditions was investigated, as well as of ratio of light intensity in the 420–520 nm range to light in the 580–680 nm range (I420–520/I580–680) and of artificial irradiation provided by red and white LED lamps in a closed flat plate laboratory bioreactor on the growth rate and composition. The increase in solar irradiance led to faster growth rates (μexp) of C. vulgaris under both environmental conditions studied in the greenhouse (in June up to 0.33 d−1 and in September up to 0.29 d−1) and higher lipid content in microalgal biomass (in June up to 25.6% and in September up to 24.7%). In the experiments conducted in the closed bioreactor, as the ratio I420–520/I580–680 increased, the specific growth rate and the biomass, protein and lipid productivities increased as well. Additionally, the increase in light intensity with red and white LED lamps resulted in faster growth rates (the μexp increased up to 0.36 d−1) and higher lipid content (up to 22.2%), while the protein, fiber, ash and moisture content remained relatively constant. Overall, the trend in biomass, lipid, and protein productivities as a function of light intensity was similar in the two systems (greenhouse and bioreactor).

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Alaskan moose measurements and weights and measurement–weight relationships

Canadian Journal of Zoology ◽

10.1139/z78-040 ◽

1978 ◽

Vol 56 (2) ◽

pp. 298-306 ◽

Cited By ~ 27

Author(s):

Albert W. Franzmann ◽

Robert E. LeResche ◽

Robert A. Rausch ◽

John L. Oldemeyer

Keyword(s):

Growth Rate ◽

Blood Parameters ◽

Field Application ◽

Regression Equations ◽

Body Measurements ◽

Male And Female ◽

Total Length ◽

Chest Girth ◽

Hind Foot ◽

Alces Alces Gigas

A total of 1329 Alaskan moose (Alces alces gigas) were measured for total length, 1340 for chest girth, 1317 for hind foot, 618 for shoulder height, and 1219 for ear length. Five hundred and four moose were weighed. These data were classified by sex, age, month sampled, and location. Growth rates were plotted and discussed. No morphometric differences were detected by sex and location classifications up to age 36 months. Location differences were detected which corresponded to general condition, productivity, and condition related blood parameters of the populations. Seasonal weight patterns demonstrated increases from 21 to 55% from spring to late fall. Measurements, particularly total lengths, were better indicators of growth rate than were weights. All body measurements were significantly correlated with weight: total length, r (correlation coefficient) = 0.94; chest girth, r = 0.90; shoulder height, r = 0.87; and hind foot, r = 0.81. Combined sex regression equations were derived because the slight differences between the male and female regression lines were unimportant in field application. These regression equations were as follows: weight (kilograms) = −239.7 + 2.07(total length); weight (kilograms) = −245.3 + 3.14(chest girth).

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Effects of light intensity and temperature on Cylindrospermopsis raciborskii (Cyanobacteria) with straight and coiled trichomes: growth rate and morphology

Brazilian Journal of Biology ◽

10.1590/s1519-69842012000200016 ◽

2012 ◽

Vol 72 (2) ◽

pp. 343-351 ◽

Cited By ~ 15

Author(s):

MC. Bittencourt-Oliveira ◽

B. Buch ◽

TC. Hereman ◽

JDT. Arruda-Neto ◽

AN. Moura ◽

...

Keyword(s):

Growth Rate ◽

Light Intensity ◽

Morphological Changes ◽

Population Control ◽

Distinct Species ◽

Cylindrospermopsis Raciborskii ◽

Climatic Chamber ◽

Light Intensities ◽

Different Temperatures ◽

Lower Temperature

Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju (Ordem Nostocales) is one of the most troublesome bloom-forming species in Brazil. Understanding the population dynamics of the different morphotypes of C. raciborskii (straight and coiled) could assist in the prediction of favourable conditions for the proliferation of this potentially toxin-producing species. The aim of the present study was to assess the effects of two different light intensities and temperatures on the growth rate and morphology of the trichomes of the straight and coiled morphotypes. For such, two non-toxin producing strains of C. raciborskii were used - one with a coiled trichome (ITEP31) and another with a straight trichome (ITEP28). The strains were cultured in BG-11 medium in a climatic chamber under controlled conditions. Two light intensities (30 and 90 µmol.m-2.s-1 ) were combined at temperatures of 21 and 31 °C and the growth rate and morphological changes were analysed. The morphotypes responded differently to the different temperatures and light intensities. Both strains exhibited faster growth velocities when submitted to higher light intensity and temperature. The lower temperature and higher luminosity hampered the development of both strains. Variations in cellular morphology and an absence of akinetes in both strains were related to the lower temperature (21 °C). The coiled morphotype demonstrated considerable phenotype plasticity, changing the morphology of trichome throughout its growth curve. Although molecular analysis does not sustain the separation of the morphotypes as distinct species, their different eco-physiological responses should be considered further knowledge of extreme importance for the population control of these potentially toxic organisms.

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