Thermal tolerance of purple mud crab, Scylla tranquebarica (Fabricius, 1798), during egg incubation, larval rearing and juveniles’ production

2021 ◽  
Author(s):  
Ariffin Hidir ◽  
Mohd Amran Aaqillah‐Amr ◽  
Muda Mohd‐Sabri ◽  
Ibrahim Mohd‐Zaidi ◽  
Md. Sheriff Shahreza ◽  
...  
Keyword(s):  
Thermal Tolerance ◽  
Larval Rearing ◽  
Mud Crab ◽  
Egg Incubation

scholarly journals THE EFFECTS OF WEANING TIME ON THE GROWTH AND SURVIVAL OF MUD CRAB (Scylla olivacea)THE EFFECTS OF WEANING TIME ON THE GROWTH AND SURVIVAL OF MUD CRAB (Scylla olivacea)

2018 ◽  
Vol 13 (2) ◽  
pp. 63
Author(s):  
Haryati Haryati ◽  
Yushinta Fujaya ◽  
Early Septiningsih
Keyword(s):  
Survival Rate ◽  
Artificial Diet ◽  
Control Treatment ◽  
Larval Rearing ◽  
Mud Crab ◽  
Artificial Diets ◽  
Growth And Survival ◽  
The Third ◽  
Crab Larvae ◽  
Research Experiment

Live foods such as rotifers and Artemia are commonly used as foods in larval rearing of mud crab (S. olivacea). However, the continuous availability and nutritional consistency of live foods are difficult to control. Thus, the development of artificial diets to partially or fully replaced live foods is needed to overcome the limitations of live foods. The purpose of this research was to determine the best stage at which mud crab larvae can be weaned from live foods to artificial diets. The research experiment consisted of: treatment-1, the larvae were fed with live foods from zoea-1 to megalopa stages as the control treatment; treatment-2, the larvae were fed with artificial diet from zoea-2 to megalopa stages; and treatment-3, the larvae were fed with artificial diet from zoea-3 to megalopa stages. In treatment-4, artificial diet was given from zoea-4 to megalopa stages. The growth and survival rate of larvae in treatment-1, 3, and 4 were not significantly different (P>0.05) but significantly different with treatment-2. Based on the present results, this study suggests that artificial diet can be given to mud crab larvae (S. olivacea) from the third zoea stage.

scholarly journals Rearing of Mud Crab, Scylla tranquebarica Larvae with Different Stocking Densities

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Gunarto Gunarto ◽  
Sulaeman Sulaeman
Keyword(s):  
Stocking Density ◽  
Larval Rearing ◽  
Life Stages ◽  
Asian Countries ◽  
Mud Crab ◽  
Experimental Tank ◽  
Fibre Glass ◽  
Commercial Diet ◽  
Stage Development ◽  
Southeast Asian Countries

Mud crab (Scylla tranquebarica) is an important aquaculture species, especially in Southeast Asian Countries. However, the larval rearing of this species faces problems resulted in low survival caused not only by intensif canibalism but also by prolonged in larval rearing period. The stocking density during ealy life stages is proposed to influence  the crablet production in the larvae rearing tanks. The objective of this research was to evaluate the effect of stocking densities on larval stage development and crablet production of mud crab, S. tranquebarica. Four different initial stocking densities of larvae were tested using 200 L fibre glass tank, namely:  A). 30 ind,/L, B). 45 ind./L, C). 60 ind./L and D). 75 ind./L. Rotifer, Brachionus sp, and Artemia nauplii were  fed to the larvae with additional commercial diet. Water exchanged in the rearing tank was performed since 7 days post hatching (dph)  to 20 dph  at  a rate of 10 to 40%. Larvae from each experimental tank was sampled periodically (2 to 4 days interval) in order to calculate larvae population, larvae development index (LDI). Megalopa occurences index (MOI), and crablet production were also monitored. The result showed that the highest of LDI and MOI were obtained from  treatment B and D which were significantly different (P<0.05) to the other treatments. Furthermore, the highest of crablet production was obtained from treatment D = 495.3+22.48 ind./tank, which was significantly higher (P<0.05) compared to treatment A (48.5+4.94 ind./tank), treatment B (167.5+10.61 ind./tank) and treatment C (218.33+10.41 ind./tank). Therefore, the stocking density of 75 ind./L is optimum for mud crab S. tranquebarica larvae and recommended to be applied for commercial larvae production in hatchery. Keyword: Production, crablet, stocking density, larvae, Scylla tranquebarica

scholarly journals Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures

Animals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1146
Author(s):  
Muhammad Nur Syafaat ◽  
Mohamad Nor Azra ◽  
Faridah Mohamad ◽  
Che Zulkifli Che-Ismail ◽  
Adnan Amin-Safwan ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Thermal Tolerance ◽  
Scylla Paramamosain ◽  
Acclimation Temperature ◽  
Tolerance Interval ◽  
Physiological Changes ◽  
Mud Crab ◽  
Molting Cycle ◽  
Preferred Temperature ◽  
Significant Difference

This study was carried out to determine the physiological changes (survival, growth, molting cycle, sex differentiation, and gill condition) of mud crab, Scylla paramamosain crablet at different water temperatures of 24, 28 and 32 °C, and ambient temperature of 27 to 30 °C. Thermoregulatory behavior, represented by preferred temperature (29.83 ± SD 2.47 °C), critical thermal minimum (17.33 ± SD 0.58 °C), critical thermal maximum (40 ± SD 0.00 °C), and thermal tolerance interval (22.67 ± SD 0.58 °C), were checked for Crablet 1 stage only (with ambient temperature as acclimation temperature).Both low (24 °C) and high (32 °C) temperatures were associated with lower growth performance, and survival rate (p < 0.05), in comparison with both 28 °C and ambient temperature treatments.Male ratio at low temperaturetreatment (24 °C) was higher (80.09 ± SD 18.86%) than for other treatments (p < 0.05), observed as 44.81 ± D 10.50%, 41.94 ± SD 19.44%, and 76.30 ± SD 5.13% for 28 °C, 32 °C and ambient temperature treatments, respectively. However, there was no significant difference observed between 24 °C, 28 °C, and ambient temperature treatments. Anatomical alterations of gill lamellae of S. paramamosain crablet for both 32 °C, and 24 °C treatments, appeared thinner and paler than at both 28 °C, and ambient temperature treatments. Based on this study, temperature of 28 to 30 °C was recommended as the optimal temperature for the long-term nursery phase of S. paramamosain.

Effects of rearing temperature on egg incubation, growth, standard metabolic rate, and thermal tolerance of chocolate mahseer, Neolissochilus hexagonolepis

2021 ◽  
Vol 98 ◽  
pp. 102942
Author(s):  
Pragyan Dash ◽  
Ritesh Shantilal Tandel ◽  
Nityanand Pandey ◽  
Paramita Banerjee Sawant ◽  
Debajit Sarma ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Thermal Tolerance ◽  
Standard Metabolic Rate ◽  
Rearing Temperature ◽  
Egg Incubation ◽  
Growth Standard

scholarly journals THE EFFECTS OF AN ARTIFICIAL COMMERCIAL FEED SUPPLEMENTATION ON LARVAL REARING AND CRABLET PRODUCTION OF MUD CRAB Scylla tranquebarica

2018 ◽  
Vol 13 (1) ◽  
pp. 13 ◽  
Author(s):  
Gunarto Gunarto ◽  
Muhammad Nur Syafaat ◽  
Herlinah Herlinah ◽  
Sulaeman Sulaeman ◽  
Muliani Muliani
Keyword(s):  
Larval Development ◽  
Larval Rearing ◽  
Mud Crab ◽  
Larval Population ◽  
Feed Supplementation ◽  
Crab Larvae ◽  
Artemia Nauplii ◽  
Commercial Feed ◽  
Essential Nutrient ◽  
Newly Hatched Larvae

The effects of an artificial commercial feed supplementation on larval rearing and crablet production of mud crab Scylla tranquebarica. In mass production of mud crab seeds, only rotifer and Artemia nauplii are usually fed to mud crab larvae rearing until the larvae develop to crablet stage. The supplementation of artificial commercial feed from zoea-3 stage is expected to supply an essential nutrient required for an optimum larval development. The research was aimed to determine the optimum dosage of commercial feed supplementation for a successful larval rearing to produce crablet in hatchery. Newly hatched larvae of mud crab were stocked at a density of 100 ind./L. The larvae were fed with rotifer and Artemia nauplii. Microbound artificial commercial feed sized <100 microns (protein 52%, fat 14,5%, fiber 3% and water content 10%) was supplemented to the larvae from zoea-3 to megalopa stage at different dosages namely: a). 0.5 mg/L/2 days; b). 0.75 mg/L/2 days; c). 1.0 mg/L/2 days; d). 1.25 mg/L/2 days. Larval population, larval development indices (LDI), megalopa occurrence index (MOI) and crablet production were observed and measured. Water quality (ammonium, nitrite, Total Organic Matter (TOM), and total Vibrio sp. count were also monitored. The LDI, MOI, and crablet production from each treatment were compared and tested using one way-ANOVA. The results showed that the survival rate of larvae at zoea-5 ranged between 29-33%. The LDI was not significantly different (P>0.05) among treatments. However, the MOI of treatment A and B at day 21 ph was significantly higher (P<0.05) compared with treatment C and D. In addition, the crablet production in treatment B, C and D were significantly higher (P<0.05) compared with treatment A. It was concluded that the supplementation of artificial commercial feed in larval rearing of S. tranquebarica could be applied at the dosage range of 0.75-1.25 mg/L/2-days from zoea-3 until crablet (C-7) stage.

Larval rearing of mud crab (Scylla): What lies ahead

Aquaculture ◽  
2018 ◽  
Vol 493 ◽  
pp. 37-50 ◽  
Author(s):  
Khor Waiho ◽  
Hanafiah Fazhan ◽  
Emilia T. Quinitio ◽  
Juliana C. Baylon ◽  
Yushinta Fujaya ◽  
...  
Keyword(s):  
Larval Rearing ◽  
Mud Crab

scholarly journals Optimisation of nursery rearing for megalopa of giant mud crab Scylla serrata (Forskal, 1775)

2019 ◽  
Vol 66 (1) ◽  
Author(s):  
Jose Antony ◽  
C.P. Balasubramanian ◽  
J. Balamurugan ◽  
K.P. Sandeep ◽  
I.F. Biju ◽  
...  
Keyword(s):  
Body Weight ◽  
Survival Rate ◽  
Life Stage ◽  
Survival Rates ◽  
Stocking Density ◽  
Scylla Serrata ◽  
Larval Rearing ◽  
Mud Crab ◽  
Gracilaria Tenuistipitata ◽  
Crab Larvae

Three nursery rearing trials were conducted to overcome the inconsistent survival of megalopa of the giant mud crab Scylla serrata (Forskal, 1775) during metamorphosis to crab instar. In the first trial, 3-4 days old megalopa (4.73 mg mean body weight) were stocked in hapas erected in outdoor brackishwater ponds and indoor fiberglass (FRP) tanks at densities of 500 nos. m-2 and 1 no. l-1 respectively and reared for 15 days using minced clam meat (Meretrix casta) as feed. Outdoor hapas were provided with seaweed, Gracilaria tenuistipitata as shelter. Mean survival rate of crab instar following three consecutive runs were significantly higher (p<0.05) for megalopa reared in outdoor hapas (57.7±2.7%) over indoor FRP tanks (24.1±2.2%). To ascertain the life stage that yields optimal survival on weaning from indoor hatchery to ponds, zoea 5 (Z5) and megalopa 1-day old (M1), 2-day old (M2), 3-day old (M3) and 4-day old (M4) were reared in hapas for15 days and fed on minced clam meat. Three day and 4-day old megalopa demonstrated significantly higher survival rates (p<0.05) of 62.3±3.08% and 69.6±2.35% respectively to crab instar stage at conclusion of the trial. Megalopa (3-4 days old, 5.05 mg mean body weight) were stocked to 100 l tanks (stocking density - 1 no. 4 l-1) and reared for a period of 8 days using different feeds viz., artemia biomass (T1), minced clam meat (T2), crab larvae (T3) and artemia nauplii (T4) in the third trial to evaluate various production parameters. Crab instar conversion rate (number of crab instars/number of megalopa stocked × 100) was significantly higher (p<0.0001) for megalopa fed using artemia biomass (T1) and minced clam meat (T2) at 74.66±5.81% and 72.00±2.30% respectively. Results of the present study indicate that, high density rearing (500 no. m-2) of megalopa (3-4 days old) in outdoor hapas provided with seaweed refuge for short periods (15 days) would yield higher survival rate to crab stage. Nursery rearing of megalopa in ponds reduces the hatchery phase in mud crab larval rearing and maximise production of crab instars.

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