The dynamics abundance of meroplankton in Nusalaut coastal waters, Central of Maluku Regency

Abstract

Abundance and diversity of meroplankton (larvae of benthos and nekton, including eggs) in the Nusalaut coastal waters were investigated. The research was conducted in two months (May 2009; April 2014). The abundance of meroplankton was collected from NORPAC net (0.33 mm, mesh size) by vertical hauling from 10 meters of deep to the surface. The samples were taken in 8 stations and repeated in April 2014. All samples were preserved with 4% formaldehyde and analyzed using microscope. In May 2009, total abundance of meroplankton varied between 84 ind.m-3 and 780 ind.m-3, but mainly fluctuated around 300-500 ind.m-3. Larvae of 13 taxa were identified. Fish eggs represented the most predominant taxa (average abundance 96 ind.m-3), followed by echinodermata larvae (81 ind.m-3). Meanwhile, in April 2014 total abundance was lower. During this period, the total abundance varied between 8 ind.m-3 and 48 ind.m-3. Larvae of 7 taxa were found. Echinodermata larvae represented the most predominat taxa (average abundance 6 ind.m-3), followed by gastropoda larvae (5 ind.m-3). It is suggested that spawning season occurred during May, indicated from the high value of total abundance of meroplankton.