Sains Malaysiana 41(10)(2012): 1193–1196

Light Intensity Requirements for Feeding Behaviour by the Brown-marbled Grouper, Epinephelus fuscoguttatus

(Keperluan Keamatan Cahaya untuk Perlakuan Pemakanan Ikan Kerapu Harimau, Epinephelus fuscoguttatus)

Yukinori Mukai^1,*, Leong Seng Lim², Kien Chee Lu³, Mohamed Kamil Abdul Rashid¹ & Shahbudin Saad¹

¹Institute of Oceanography and Maritime Studies (INOCEM), Kulliyyah of Science

International Islamic University Malaysia, Jalan Sultan Ahmad Shah

Bandar Indera Mahkota, 25200, Kuantan, Pahang, Malaysia

²Borneo Marine Research Institute, Universiti Malaysia Sabah

88400, Kota Kinabalu, Sabah, Malaysia

³Seed Production Center, 177 Tanjung Badak, 89208, Tuatan, Sabah, Malaysia

Diserahkan: 10 November 2011 / Diterima: 19 Jun 2012

ABSTRACT

In this study, we investigated the feeding behavior of the brown-marbled grouper, Epinephelus fuscoguttatus with light intensities ranging over eight orders of magnitude from 0–1000 lx to estimate the optimum light intensity for larval rearing. Artemia ingestion rates of E. fuscoguttatus of 36 days and 42 days old larvae were measured in feeding behavior experiments and they were significantly higher with light intensities ≥10 lx compared with feeding rates at ≤1 lx. E. fuscoguttatus larvae also exhibited Artemia ingestion rates in the dark or in dim lighting (0–1 lx) that were about 20% of the ingestion rates with ≥10 lx.

Keywords: Brown-marbled grouper, Epinephelus fuscoguttatus; feeding behavior; ingestion rates; Visual thresholds

ABSTRAK

Dalam kajian ini kami telah menyelidik tabiat pemakanan ikan kerapu harimau, Epinephelus fuscoguttatus dengan keamatan cahaya berjulat lebih daripada lapan tingkat magnitud daripada 0 – 1000 lx bagi menentukan keamatan cahaya yang optimum untuk ternakan larva ikan. Kadar pengambilan Artemia oleh larva E. fuscoguttatus pada umur 36 hari dan 42 hari diukur dalam uji kaji tabiat permakanan dan didapati tinggi bersignifikan dengan keamatan cahaya ≥ 10 lx jika dibandingkan dengan kadar pemakanan pada ≤ 1 lx. Sebaliknya, larva ikan memperlihatkan kadar pengambilan Artemia dalam keadaan gelap atau cahaya samar (0 – 1 lx) sebanyak 20% daripada kadar pengambilan dengan ≥ 10 lx.

Kata kunci: Epinephelus fuscoguttatus; kadar pengambilan; kerapu harimau; tabiat permakanan; tahap penglihatan

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*Pengarang untuk surat-menyurat; email: mukai9166@gamil.com