Detection and Analysis of Harmful Algal Blooms and Fish Mortalities in Jakarta Bay Via Satellite Imagery | Chapter 1 | Scientific Research, New Technologies and Applications Vol. 5

The coastal region of Jakarta Bay is susceptible to fish mortality and harmful algal blooms (HAB), often triggered by human activities and environmental changes. This study analyzed data from the Terra and Aqua MODIS satellites collected between 2004 and 2015 to measure chlorophyll-a levels indicative of algal blooms. The research aimed to identify and examine fish mortality and HAB in Jakarta Bay using satellite imagery. Multispectral and hyperspectral satellite data were processed to detect harmful algae distribution and fish mortality regions, integrating field data, biological water parameters, and remote sensing data. The findings suggest satellite imagery effectively monitors chlorophyll-a concentration variations, which is crucial for HAB detection. However, severe blooms do not always result in significant fish deaths. The primary cause of fish mortality was insufficient water circulation, which led to oxygen deficiency during peak blooms. The study highlights the potential of satellite-based monitoring for identifying and managing toxic algal blooms and fish deaths, providing essential data for water resource management in Jakarta Bay. Despite limitations like cloud cover, developing an early warning system (EWS) using satellite imagery is proposed as a revolutionary solution for algal blooms. This technique is vital for establishing an EWS in Jakarta Bay.

 

 

Author (s) details

Tumpak sidabutar
Research center for oceanography, national research and innovation agency (brin), jl. Pasir putih i, jakarta 14430, indonesia.

 

Endang s. Srimariana
Department of marine science and technology, faculty of fisheries and marine sciences, ipb university dramaga bogor, jawa barat 166680, indonesia.

 

H.a.w cappenberg
Research center for oceanography, national research and innovation agency (brin), jl. Pasir putih i, jakarta 14430, indonesia.

 

S. Wouthuyzen
Research center for oceanography, national research and innovation agency (brin), jl. Pasir putih i, jakarta 14430, indonesia.

 

 

Please see the book here:- https://doi.org/10.9734/bpi/srnta/v5/1234

Fish Mortalities Linked to Harmful Algal Bloom of Cochlodinium polykrikoides in Lampung Bay | Chapter 1| Contemporary Research and Perspectives in Biological Science Vol. 3

In October and November 2012, the waters of Lampung Bay in Indonesia turned dark reddish-brown due to a harmful algal bloom (HAB) caused by a rapid increase in phytoplankton, commonly known as red tide. This event resulted in the mass death of fish farmed in floating nets. The bloom was driven by the dinoflagellate Cochlodinium polykrikoides, the first documented occurrence of this species in Indonesian waters, with peak concentrations of 3.07 x 107 cells L⁻¹. Since this event, similar blooms have occurred in the following years, though they have not always resulted in significant fish mortality. Water samples for nutrient analysis were collected using a 20 μm mesh plankton net and Nansen bottles at a depth of one meter, focusing on nitrate and phosphate levels. The results suggest that fish kills were primarily due to nighttime hypoxia, likely caused by phytoplankton blocking the fish's gills. The bloom onset was associated with a high nitrate-to-phosphate ratio, suggesting that nitrate acted as the main trigger while phosphate was the limiting factor for flower development. This study represents the first documented bloom of Cochlodinium polykrikoides in Lampung Bay and highlights the critical role of nutrient imbalances in the occurrence of harmful algal blooms and their significant ecological impacts on coastal ecosystems in Indonesia.

 

Author (s) Details

Endang Sunarwati Srimariana
Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University Dramaga Bogor, Jawa Barat 166680, Indonesia.

 

Meutia Samira Ismet
Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences, IPB University Dramaga Bogor, Jawa Barat 166680, Indonesia.

 

H.A.W Cappenberg
Research Center for Oceanography, National Research and Innovation Agency (BRIN), Jl. Pasir Putih I, Jakarta 14430, Indonesia.

 

Tumpak Sidabutar
Research Center for Oceanography, National Research and Innovation Agency (BRIN), Jl. Pasir Putih I, Jakarta 14430, Indonesia.

 

Please see the book here:- https://doi.org/10.9734/bpi/crpbs/v3/1233