STUDY OF THE CARRYING CAPACITY OF EKAS BAY ECOSYSTEM WITH MASS BALANCE TROPHIC : Abstract

• Main Author: Indrayanti <br> NIM. 224 02 003, Elis
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/6044
• Institution: Institut Teknologi Bandung

</i><b>Abstract: <i></b><p align="justify"> Study of the carrying capacity of Ekas Bay ecosystem was conducted using Ecopath with Ecosystem 5.0 Beta software. The study was aimed to get the snapshot of trophic flow of Ekas Bay ecosystem and to assess the impacts of fishing on the biomass of functional groups i.e. medium demersal, grouper, coral and adult penaid through the use of Ecosim. The simulation was carried out for 10 years with the scenarios of increasing fishing mortality rate (F) : 10 %, 20 %, 50 %, 75 % and 100 %.<p align="justify"> Ecopath’s result indicates that Ekas Bay ecosystem spans over more than four trophics level and dolphin being the top predator. The trophic model consist of 18 functional groups i.e. 7 fish groups, 6 invertebrata groups, 2 primary producers, coral, dolphin and detritus. Result shows that ratio between total production and total respiration (Pp/R) is 2.034; ratio between production and biomass (P/B) is 5,4 and Finn Cycling Index is 3,04. Result also suggests that the Ekas Bay to be on development stage.<p align="justify"> Simulations of different fishing mortality rates (F) show a strong impact on the biomass of medium demersal, grouper, coral and penaid. Increasing fishing mortality by 10 %, 20 %, 50 %, 75 % and 100 % resulted in marked decrease in average of biomass of medium demersal, grouper and coral by 8 % - 99,8 %. On the other hand, the biomass of adult penaid increases significantly (2 – 9 %) due to recruitment. Increasing coral mortality by 50 % of coral causes decreasing in biomass of medium demersal by 53 % and penaid 6 %, but increasing biomass of small demersal by 5,6 %.</p>