Livelihood vulnerability household fishermen household due to climate change in Lampung Province, Indonesia

The selection of fishermen based on their households, using stratified sampling based on the number and type of boat ownership. Furthermore, the respondents to this study were cho- sen using simple random selection. Determination of the number of respondents using the Slovin formula, as follows [30] with a total of 166 fishermen from traditional fishing house- holds that possess an average small boat ranging in size from 1 GT to 5 GT. The sampling information are as follows 36 fishing households from Bandar Lampung, 65 fishing households from South Lampung Regency and 65 fishing households from Tanggamus Regency. Primary data is obtained through direct interviews with respondents who meet the research criteria using questionnaires and direct observation and recording related to the data used in the study. Secondary data is data based on literature relevant to research and data from rele- vant agencies. Validity and reliability tests were conducted on the vulnerability section of the questionnaire. The validity value can be determined by finding the r count and comparing it with the r table. Question items are said to be valid if r count > r table. The reliability value can be good if Cronbach’s Alpha value is greater than 0.60 [31]. The data analysis method to analyze the income structure of fisher households is based on the household income structure. The income structure analysis in this study refers to the calcu- lation of total income of fisher households. The source of income of fisher households can be

categorized as on fisheries income, Income from fishing hired labourers and non-fisheries income, such as crop farming and non-agricultural activities (industry, trade and services). To analyse capture fisheries business income is calculated using the formula according to [32]: p ¼ TR TC ð1Þ where, TR ¼ P:Q and TC ¼ TFC þ TVC Description: π = Income (IDR/season) TR = Total revenue (IDR/season) TC = Total cost (IDR/season) P = Product price (IDR/kg) Fig 1. Fishing households’ dispersion index. https://doi.org/10.1371/journal.pone.0315051.g001 PLOS ONE Livelihood vulnerability household fishermen due to climate change in lampung province PLOS ONE | https://doi.org/10.1371/journal.pone.0315051 December 31, 2024 5 / 20