Sains Malaysiana 52(3)(2023): 693-704

http://doi.org/10.17576/jsm-2023-5203-02

Do Salinity, Limb Autotomy and Crab Sources Stimulate Shedding Efficiency of Mud Crab in Soft-Shell Production?

(Adakah Kemasinan, Autotomi Anggota dan Punca Ketam Merangsang Kecekapan Penanggalan Ketam Bakau dalam Penghasilan Cangkang Lembut?)

MD. HASHMI SAKIB¹, SHAWON AHMMED¹, DEBASHIS KUMAR MONDAL¹, MD. LATIFUL ISLAM^1,* & YAHIA MAHMUD²

¹Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna-9280, Bangladesh

²Bangladesh Fisheries Research Institute, Mymensingh-2201, Bangladesh

Received: 14 September 2022/Accepted: 20 January 2023

Abstract

The present study was conducted to optimize the water salinity, limb autotomy and growth performance of Juvenile mud crabs (JMC) (Scylla olivacea) cultured in control habitat (tanks, hatchery) compared to wild sources. In this regard, a study was  performed in tanks with 5, 10, 15 ppt salinity level and in a pond having natural salinity level (control). After seven weeks of JMC culturing, it was observed that better growth attributes including survival rate, weight gain and shorter shedding period of JMC was attained at 15 ppt salinity in tanks compared to control. This optimized salinity level (15 ppt) was considerd for the second study where JMC legs were autotomized. In this study, better growth performance attributes were observed when both side walking legs were autotomized compared to one side walking legs autotomy and no autotomy. Considering the same salinity level (15 ppt), the  third study was conducted to evaluate the growth performance of JMC cultured in hatchery (pilot scale) with their wild counterperts.  Result showed that higher moulting rate and better growth performance (faster weight gain) of JMC were achieved in  hatchery compared to wild cultured. However, JMC collected from hatchery and wild habitat acquired the same carapace width (CW) and body weight (BW) after twenty days rearing.

Keywords: Brackishwater; environmental stress; physical stress; hatchery; wild

Abstrak

Penyelidikan ini dijalankan untuk mengoptimumkan kemasinan air, autotomi anggota dan prestasi pertumbuhan juvenil ketam bakau (JMC) (Scylla olivacea) yang dikultur dalam habitat kawalan (tangki, tempat penetasan) berbanding punca liar. Dalam hal ini, kajian telah dilakukan di dalam tangki dengan paras kemasinan 5, 10, 15 ppt dan di dalam kolam yang mempunyai aras kemasinan semula jadi (kawalan). Selepas tujuh minggu pengkulturan JMC, diperhatikan bahawa sifat pertumbuhan yang lebih baik termasuk kadar kemandirian, pertambahan berat badan dan tempoh penanggalan JMC yang lebih pendek telah dicapai pada kemasinan 15 ppt dalam tangki berbanding kawalan. Tahap kemasinan yang dioptimumkan ini (15 ppt) telah dipertimbangkan untuk kajian kedua dengan kaki JMC diautomisasi. Dalam kajian ini, atribut prestasi pertumbuhan yang lebih baik diperhatikan apabila kedua-dua kaki berjalan sisi diautomisasi berbanding autotomi kaki berjalan sebelah dan tiada autotomi. Dengan mengambil kira tahap kemasinan yang sama (15 ppt), kajian ketiga telah dijalankan untuk menilai prestasi pertumbuhan JMC yang dikultur dalam tempat penetasan (skala perintis) dengan rakan liar mereka. Keputusan menunjukkan bahawa kadar penyalinan kulit yang lebih tinggi dan prestasi pertumbuhan yang lebih baik (pertambahan berat badan yang lebih cepat) JMC telah dicapai dalam tempat penetasan berbanding dengan kultur liar. Walau bagaimanapun, JMC yang diambil dari tempat penetasan dan habitat liar mempunyai lebar karapas (CW) dan berat badan (BW) yang sama selepas pemeliharaan dua puluh hari.

Kata kunci: Air payau; liar; tekanan alam sekitar; tekanan fizikal; tempat penetasan

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^*Corresponding author; email: latiful.bfri@gmail.com