Length weight relationships and fecundity estimates of long-spined Sea Urchin, Diadema setosum, from the Pulau Pangkor, Peninsular Malaysia

Abstract

The present study is an attempt to describe the size frequency distribution, length weight relationships and fecundity estimates of long-spined Sea Urchin, Diadema setosum from the Pulau Pangkor, Peninsular Malaysia. In total 101 specimens of D. setosum were collected from the inter-tidal reef of Pulau Pangkor of Parek during the breeding season in May-August, 2010. Individual total length (TL) was measured using digital slide calipers and individual body weight (BW) was taken using a digital balance. Mean length of D. setosum was estimated as 59.66 mm and the mean weight was 101.68 g. Among the 101 specimens, 52 were males and 49 were females, indicating a sex ratio of male to female of 1:0.94. The logarithmic form of length-weight relationship of D. setosum was Log W = −1.3977 + 1.9049 * Log TL, while the exponential form of equation obtained for the length-weight relation was W = 0.04 * TL 1.9049 . The value of regression co-efficient (r 2 ) estimated for the species was 0.63. The mean fecundity was estimated at 7,313,600 (±567,992) with a range between 6,290,000 and 7,980,000 eggs. Analysis of the relationship between the absolute fecundity (F) and total length (TL), and also between the fecundity and drained body weight (DW), revealed a linear regression model with a positive and significant relationship. This study presents results on the total length-body weight relationships and fecundity estimates of this Sea Urchin from Pulau Pangkor, Peninsular Malaysia for the first time.

Status of Sea Urchin Resources in the East Coast of Borneo

“…Since the Pencil urchin consists of several genera, P. imperialis is considered as one of the new records for Malaysian waters. Compared with previous sea urchin species that had been recorded in coral reefs of Malaysia [10,11,13,14,18], three species are new records (P. imperialis, M. globulus, and P. maculata) and three species were not found in this study (Astropyga radiata, E. diadema, and Parasalenia gratiosa). The total number of sea urchins found in this study was 3,441 individuals.…”

Antimicrobial agents from sea urchin (Diadema setosum) collected from the Red Sea, Egypt

“…Among the echinoderms, D. setosum is one of the most widely distributed sea urchins, in the Indo-West Pacific Ocean, where it occurs from the Red Sea (Gulf of Suez, Gulf of Aqaba, northern and southern Red Sea) and the east coast of Africa to Japan and Australia (Lessios et al, 2001). The occurrence of D. setosum covers both tropical waters and temperate zones (Rahman et al, 2012). Previous work showed that the gonads of D. setosum also are rich in various bioactive compounds, including polyunsaturated fatty acids (PUFAs) and βcarotene (Dincer and Cakli, 2007).…”

Estimation of the feeding pressure of a sea urchin (<i>Diadema setosum</i>) population on a barren ground in a temperate region of Japan

“…In the Caribbean coral reefs, the TD of D. antillarum is 57.0±3.6 mm on the reef slope and 56.9±0.7 mm on the reef edge (Blanco et al 2010). The TD of D. mexicanum in the coral reef of California Bay is 43.8 mm±15.0 (Alvarado et al 2016) and that of D. setosum around Pangkor Island, Malaysia, is 58.73± 5.08 mm (Rahman et al 2012). Therefore, the mean TD of Diadema populations is within a 40-60 mm range.…”