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Analysis of Plankton as Food for Lempuk Fish (Gobiopterus spp.) from Ranu Grati, Pasuruan, East Java, Indonesia, as Information for Domestication Efforts

Hertika Asus Maizar Suryanto, Musa Muhammad, Farikhah, Putra Renanda B. D. S., Afendy Sigit, Khasanah Alfi, Fitrianesia Fika, Alfarisi Muhammad Asnin

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 1

190--202

The Lempuk fish (Gobiopterus spp.) is a kind of fish that is exclusively found and inhabits the Ranu Grati area in Pasuruan Regency. The Lempuk fish is a prominent tourist attraction and is frequently targeted for fishing due to its significant economic significance. This leads to excessive exploitation, resulting in population decline and posing a threat to its sustainability. Therefore, it is necessary to identify the abundance and type of plankton, as well as its relationship with the study of stomach contents, to gather supporting data for future domestication efforts. The sampling was conducted three times, with a two-week gap, at five distinct sites. The research employed a quantitative-descriptive approach and the sampling a purposive sample technique. The research findings revealed the presence of four distinct classes with 20 different species in the phytoplankton community, as well as four distinct classes with 12 genera in the zooplankton community. The study of stomach conten this fish shows, primary diet of this fish, as shown by their propenderence index, consists of phytoplankton from the Asterionella species and zooplankton from the Daphnia genus.

Performance of Metallothionein Biomarker from Sulcospira testudinaria to Assess Heavy Metal Pollution in the Brantas River Watershed, Indonesia

Hertika Asus Maizar Suryanto, Arfiati Diana, Lusiana Evellin Dewi, Putra Renanda B. D. S.

Journal of Ecological Engineering

2023

Vol. 24, nr 3

276--286

Heavy metal pollution in freshwater ecosystems is a critical issue because it threatens the ecosystem as well as public health. Early detection of these pollutants is therefore essential, and biomarker analysis can be an ideal way to achieve this. Metallothionein (MT) protein is a widely-used molecular biomarker related to the physiological and biological changes which suitable bioindicators, like freshwater snails, undergo in stressful environments. The purpose of this research is to assess the relationship between the heavy metals lead (Pb), cadmium (Cd) and mercury (Hg) and MT levels in freshwater snails (Sulcospira testudinaria) in the Brantas River watershed. Heavy metals were assayed using an atomic absorption spectrophotometer, while MT levels were analyzed using indirect enzyme-linked immunosorbent assay (ELISA). Water quality parameters including temperature, dissolved oxygen (DO), biological oxygen demand (BOD), ammonia concentration, and phenol concentration were also measured. Samples were obtained from ten sampling sites at Brantas River watershed. The results indicated that Pb concentration ranged from 0.001–0.006 mg/L, Hg from 0.001–0.005 mg/L, and Cd from 0.005–0.03 mg/L, while MT concentration ranged from 0.40–0.80 ng/g. Relationship analysis between heavy metals and MT level in this study revealed the significant effect of Pb concentration on MT values in Sulcospira testudinaria. Therefore, MT in this snail is a potential biomarker for Pb contamination.