CHAPTER ONE

1.1 Background of the Study

Microplastics are tiny plastic particles less than 5 millimeters in size. They have become a major pollutant in aquatic ecosystems worldwide. These particles originate from degraded larger plastics, synthetic textiles, and industrial waste. Microplastics are ingested by fish and other aquatic organisms, posing threats to their health and the ecosystem.

Commercial fish species are particularly vulnerable because they often feed near the surface or along the bottom where microplastics accumulate. Once ingested, microplastics can block digestive tracts, reduce nutrient absorption, and cause internal injuries (Wright et al., 2013). Additionally, microplastics may carry toxic chemicals that accumulate in fish tissues. Humans who consume contaminated fish are therefore exposed to potential health risks.

Recent studies have documented microplastic pollution in many marine and freshwater environments. However, data on commercial fish species in local fisheries remain limited. Understanding the presence and concentration of microplastics in fish is important for environmental monitoring, public health, and sustainable fisheries management.

1.2 Statement of the Problem

Microplastic pollution is increasing due to human activities, including plastic waste disposal and industrial processes. Commercial fish species, which are consumed by humans, are at risk of ingesting these plastics. Despite this, there is limited research on microplastic accumulation in fish from local fisheries. Without this information, the health risks to consumers and the impact on fisheries remain unclear. Therefore, there is a need to analyze microplastic occurrence in commercially important fish species.

1.3 Aim of the Study

The aim of this study is to analyze the presence and concentration of microplastics in the digestive tract of commercial fish species.

1.4 Objectives of the Study

The specific objectives of the study are to:

1. Identify commercial fish species commonly consumed in the study area.

2. Examine the digestive tracts of these fish for microplastic particles.

3. Determine the types and concentrations of microplastics present.

4. Assess potential health implications of microplastic contamination for human consumers.

1.5 Research Questions

The study seeks to answer the following questions:

1. Which commercial fish species are exposed to microplastic contamination?

2. What types of microplastics are present in the digestive tracts of these fish?

3. How abundant are microplastics in the selected fish species?

4. What are the potential health implications for humans consuming these fish?

1.6 Significance of the Study

This study is important because it provides critical information on microplastic contamination in commercial fish. It will help fishery managers, environmental agencies, and public health officials understand the extent of the problem. The findings can inform policies on plastic waste management and food safety. Additionally, it contributes to scientific knowledge on microplastic pollution and raises awareness about its ecological and health impacts.

1.7 Scope of the Study

The study focuses on selected commercial fish species from local fisheries. It examines the digestive tract to detect microplastic presence, types, and concentration. The study does not investigate microplastics in water, sediment, or non-commercial fish species. Seasonal variations in microplastic ingestion are not considered due to time constraints.

1.8 Operational Definition of Terms

Microplastics: Plastic particles smaller than 5 millimeters that pollute aquatic environments.
Commercial Fish Species: Fish species commonly harvested for human consumption.
Digestive Tract: The part of the fish’s body responsible for digestion and absorption of food.
Contamination: The presence of harmful substances in an organism or environment.
Ecological Risk: The potential harm caused to organisms or ecosystems by pollutants.