Title
Length-weight relationship, movement rates, and in situ spawning observations of Holothuria scabra (sandfish) in Fiji
Author(s)
Lee, Steven;Ford, Amanda;Mangubhai, Sangeeta;Wild, Christian;Ferse, Sebastian
Published
2018
Publisher
Beche-de-Mer Information Bulletin
Abstract
This study investigated the length-weight relationship and movement rates of the sea cucumber Holothuria scabra, and reports on two in situ H. scabra spawning events at a site with relatively healthy stocks in Vanua Levu, Fiji. A length-weight equation was established − weight = 0.1878 × length2.5807 − which explained 90% of the variance for H. scabra of length 5−24 cm. H. scabra moved at a rate of 40 cm h-1 ± 3.40 SE and appeared active for 10 h day-1, displayed a home-ranging behaviour, and therefore are considered mobile within a limited range. Spawning occurred during October and December, coincided with spring tides, and was only observed around enclosures that were stocked with high densities (ca. 350 g m-2) of H. scabra. The animals aggregated around high-density enclosures prior to spawning, suggesting that spawning is density dependent. Observations during spawning indicate the length at first maturity is ca. 15 cm.

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PUB24064