Sains Malaysiana 39(6)(2010): 877–882

 

Population Parameters of Planktonic Shrimp, Lucifer intermedius (Decapoda: Sergestidae) from Sungai Pulai Seagrass Area Johor, Peninsular Malaysia

 

(Parameter Populasi Udang Plankton, Lucifer intermedius (Decapoda: Sergestidae)

dari Kawasan Rumput Laut Sungai Pulai, Johor Semenanjung Malaysia)

 

Aziz Arshad*1, S. M. Nurul Amin2, Norhafizah Osman2,  Zaidi Che Cob3 & Che Roos Saad1

 

1Department of Aquaculture, Faculty of Agriculture

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

 

2Laboratory of Marine Science and Aquaculture, Institute of Bioscience

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

 

3School of Enviromental and Earth Sciences
Faculty & Science and Technology
Universiti Kebangsaan Malaysia
43600, Bangi, Selangor, Malaysia

 

Diserahkan: 10 September 2009 / Diterima: 5 April 2010

 

ABSTRACT

 

Growth, mortality and recruitment of the sergestid shrimps Lucifer intermedius, collected from the Sungai Pulai seagrass area in Johor, Peninsular Malaysia was investigated between April 2007 and December 2007 using monthly length-frequency data. The shrimps were collected during the day by subsurface towing of a Bongo net with a mesh size of 500 μm for 30 minutes. Total length was measured monthly for 50 individuals and the estimated extreme length was 10.42 mm. The von Bertalanffy growth parameters, K and L∞ were estimated as 1.40 yr-1 and 11.10 mm, respectively. The growth performance index (φ’) was 2.237 while total mortality (Z) was calculated at 5.32 yr-1. The natural and fishing mortality was 2.99 yr-1 and 2.33 yr-1, respectively. The recruitment pattern of L. intermedius was continuous throughout the year with two major peaks. The exploitation rate (E) was estimated at 0.44. This indicates that fishery status of L. intermedius in the Sungai Pulai sea grass area of Johor Strait is below the optimum level of exploitation (E < 0.50).

 

Keywords: Growth parameters; Lucifer intermedius; Malaysia; mortality

 

ABSTRAK

 

Tumbesaran, mortaliti dan pengrekrutan udang sergestid, Lucifer intermedius yang dikumpul dari kawasan rumput laut di Johor, Semenanjung Malaysia telah dikaji antara April 2007 hingga Disember 2007 dengan menggunakan data panjang-frekuensi bulanan. Udang ditangkap pada siang hari secara menarik jaring Bongo dengan saiz matjaring 500 μm di bawah permukaan air selama 30 minit. Jumlah panjang badan diukur daripada 50 individu dan anggaran panjang ekstrem adalah 10.42 mm. Parameter tumbesaran von Bertalanffy, K and L∞ masing-masing dianggarkan bernilai 1.40 dan 11.10 mm tahun-1. Indeks prestasi tumbesaran (ϕ’) adalah 2.237 manakala jumlah mortaliti (Z) pula telah dikira pada nilai 5.32 tahun-1. Mortaliti secara semula jadi dan tangkapan adalah masing-masing berada pada tahap 0.44 dan 2.33 tahun-1. Corak pengrekrutan bagi L. intermedius adalah berterusan sepanjang tahun dengan dua puncak. Kadar pengeksploitasian telah dianggar pada nilai 0.48. Ini menunjukkan yang status perikanan L. intermedius di kawasan rumput laut Sungai Pulai Selat Johor berada di bawah daripada paras optimum eksploitasi (E < 0.50).

 

Kata kunci: Lucifer intermedius; Malaysia; mortaliti; parameter tumbesaran

 

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*Pengarang untuk surat-menyurat; email: azizarshad@putra.upm.edu.my

 

 

 

 

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