PENGGUNAAN KELAPA SEBAGAI PAKAN PADA BUDIDAYA Cherax quadricarinatus TERHADAP PERFORMA PERTUMBUHAN

Komoditas budidaya Cherax semakin meningkat karena memiliki ketahanan tubuh tinggi, mudah dibudidayakan, dapat dikonsumsi dan dijadikan sebagai krustacea hias. Penelitian ini bertujuan untuk mengetahui pengaruh pakan berbeda terhadap pertumbuhan panjang dan bobot tubuh serta kelangsungan hidup lobster air tawar (Cherax quadricarinatus). Wadah penelitian menggunakan akuarium berukuran 60x40x40 cm yang dilengkapi peralatan aerasi. Metode penelitian menggunakan rancangan acak lengkap (RAL) dengan 3 perlakuan yaitu C1: Pakan Pellet, C2: Pakan Kelapa dan C3 : Pellet+Kelapa dan masing-masing 3 kali ulangan. Penelitian tersebut memberikan pengaruh terhadap pertumbuhan bobot dan panjang tubuh namun tidak berpengaruh terhadap kelangsungan hidup lobster air tawar. Pertumbuhan bobot tertinggi diperoleh pada perlakuan C3 yaitu sebesar 4.400 gram/ekor, panjang tertinggi pada perlakuan C2 yaitu sebesar 1.220 cm/ekor dan kelangsungan hidup tertinggi yaitu pada perlakuan C2 dan C3 yaitu masing-masing 86,67%.

The effect of ethanol on some hematological parameters of the australian red claw crayfish (Cherax quadricarinatus)

Purpose: to study the effect of ethanol on the parameters of THC, the percentage of granulocytes and total protein in the hemolymph of the Red claw crayfish (Cherax quadricarinatus).Materials and methods. The object of this experiment was 26 males of the Australian red-clawed crayfish (Cherax quadricarinatus) weighing from 23 to 83 g. The individuals were evenly divided into two experimental groups - with an injection of ethanol and a control group without an injection of 13 crayfish for each group. The injection dose was 2515 mg per 100 g of body weight. A day after the introduction of ethanol, hemolymph was taken with a syringe from the ventral sinus, the syringe was pre-washed with a 4% EDTA-Na2 solution. Three parameters were determined: the total hemocyte count (THC), percent granulocytes and percent total protein content. Counting of hemocytes and determination of granulocytes were performed in a Goryaev chamber under a light microscope. The total protein was determined by the refractometric method.Results. Differences in THC and total protein between the groups were statistically unreliable (p>0,05). THC in the experimental group is 36% more than in the control group. The total protein after the introduction of ethanol actually increased by 0,7%, and relatively by 14%. There were statistically different indicators of the proportion of granulocytes (p<0,05) - the average value of 33,1% in the experimental group versus 24,5% in the control group. A reliable (p<0,05) strong feedback was revealed between the total protein and the mass of individuals in both experimental groups, while in the experimental group there is a visible shift in the values of dependent hemolymph indicators towards an increase in smaller individuals.Conclusion. A single injection of ethyl alcohol with a dosage of 2515 mg per 100 g of body weight into the hemolymph of C. quadricarinatus does not cause significant changes in the THC and total protein after 24 hours. At the same time, the proportion of granulocytes actually increases by 9%, relative to 37%. This may indicate that granulocytes are involved in the formation of cancer defense mechanisms when exposed to toxic substances. The effect of different dosages of ethanol injections and the duration of its effect on hematological parameters requires additional consideration. It is necessary to investigate its effect on other indicators, such as the pH and buffer capacity of the hemolymph, the concentration of hemocyanin, glucose, lactates and calcium.

Growth and survival rate of freshwater lobster (Cherax quadricarinatus) fed different forage feed

Lobster is among freshwater crustaceans which is potentially cultivated in aquaculture system. This present study was conducted to determine the growth and survival rate of freshwater lobster Cherax quadricarinatus fed different forage feed. The experimental methode used a completely randomized design consisted of 4 treatments in triplicate: commercial diet (PL), commercial diet and carrots (PW), commercial diet and potatoes (PK) and commercial diet and sweet potatoes (PU). The experimental lobsters were 5-7 cm in size and 6-8 g in weight. Results indicated that forage feeding can affect the total weight and length, weight gain, specific growth rate and survival rate of lobster. Data showed the best weight gain and specific growth rate were found in PW (34.37±0.30%) and (1.05±0.03%), respectively. The lowest survival rate was seen in PU at 86.67%. However, the best feed conversion ratio gained by PL at 1.74±0.09. This study suggested that the combination of commercial diet with carrots provided the best growth performances in freshwater lobster Cherax quadricarinatus.

The Effectiveness Of Maturation Stimulation Method On Fecundity And Egg Diameter Of Freshwater Lobster (Cherax quadricarinatus)

Losbter air tawar (LAT) merupakan komoditas perikanan yang memiliki banyak keunggulan sehingga oleh Kementerian Kelautan dan Perikanan LAT dijadikan komoditas budidaya andalan. Akibatnya permintaan benih LAT semakin meningkat, sementara secara alami LAT hanya memijah 2 kali per tahun. Salah satu upaya untuk meningkatkan performa reproduksi LAT yaitu pemilihan metode perangsangan maturasi yang tepat. Sehingga perlu diteliti tentang beberapa metode perangsangan maturasi induk LAT yang dapat meningkatkan performa reproduksi yaitu fekunditas dan diameter telur LAT. Rancangan yang digunakan dalam penelitian ini adalah rancangan acak lengkap, dengan 4 perlakuan dan 3 kali pengulangan. Adapun perlakuan dalam penelitian ini adalah P1 (kontrol), P2 (ablasi tangkai mata), P3 (penambahan vitamin E pada pakan), dan P4 (penyuntikan hormon). Berdasarkan hasil penelitian, perlakuan metode perangsangan maturasi yang berbeda memberikan pengaruh yang tidak berbeda nyata (P>0.05) terhadap fekunditas dan diameter telur, namun berbeda nyata dengan perlakuan kontrol. Sehingga dapat disimpulkan bahwa metode maturasi yang berbeda hanya dapat mempercepat maturasi pada induk LAT dibanding perlakuan kontrol.