Natural breeding performance in different saline water pens, crablets rearing and cannibalism in juvenile phase of mangrove mud crab (Scylla olivacea) in earthen mangrove pens
The current study focused on natural breeding techniques using locally available mud crab broods during breeding season. The breeding trial was tested in artificially created earthen pens that designed with mangrove plants and salt tolerance grass. Mature brood crabs were collected from local river...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Elsevier Inc.
2024
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/46194/1/Natural%20breeding%20performance.pdf http://ir.unimas.my/id/eprint/46194/ https://www.sciencedirect.com/science/article/pii/S1944398624005344 https://doi.org/10.1016/j.dwt.2024.100500 |
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| Summary: | The current study focused on natural breeding techniques using locally available mud crab broods during breeding
season. The breeding trial was tested in artificially created earthen pens that designed with mangrove plants and salt tolerance grass. Mature brood crabs were collected from local rivers and equally distributed in 20 L black color
plastic containers in three different salinities (T1 = 24ppt, T2 = 26ppt, and T3 = 28ppt) and covered with black
cloth. The river salinity was 26ppt during breeding season that is considered as control(T2), and treatment T1 and
T3 were prepared artificially mixing with water and sea salt respectively. Broods are reared in containers until
hatching and zoea was transferred to earthen pens immediately after hatching. Zoea were reared in earthen pens
until turns to crablet(0.027 ± 0.005 g). The broods as well as crablet were identified through molecular barcoding
and confirmed species as Scylla olivicea. Besides, morphometric characters like weight(126.22 ± 0.19 g), carapace length(6.36 ± 0.08 cm), carapace width(9.08 ± 0.08 cm), carapace color(brownish to brownish green),
Anterolateral margin and teeth (3.79 ± 0.05 cm), abdomen length(3.04 ± 0.02 cm), hand (5.50 ± 0.03 cm), carpus(2.54 ± 0.04), antenna (2.69 ± 0.07), frontal margin(2.90 ± 0.07 cm), dactylus(3.13 ± 0.06 cm), thoracic sternites(4.17 ± 0.10), merus(4.16 ± 0.11 cm) etc. are also assessed during the experiment. The hatching rate, survival %, incubation period and other parameters are significantly different among the treatments. The highest hatching rate was observed in T2(91.34 ± 4.61 %) and lowest was in T1(57.98 ± 1.38) whereas the highest survival rate was recorded in T2(10.53 ± 1.56) and lowest observed in T1(2.87 ± 0.68). The order of
incubation was T1(12.3 days) > T3(11 days) > T2(8.67days) observed during experiment. The cannibalism rate was also estimated in this experiment and observed cannibalism rate was 71.20 ± 2.08. Natural mud crab breeding is easy and can be applicable in fields at low cost with significant survival rate. |
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