Factors Influencing Fish Productivity in Rice Paddy Aquaculture: A Case Study in Vientiane Province, Central Laos

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

To determine the factors influencing the productivity of fish in rice paddies (rice-cum-fish) in Laos, this study conducted aquaculture trials using an indigenous fish (Anabas testudineus) in Feuang and Nasaythong Districts, Vientiane Province, Laos. We evaluated stocking densities (StockD), initial body weights of fingerlings (BWi), stocking durations (duration), and feeding conditions ( fed; feeding or non-feeding), which were considered the factors influencing fish productivity. The final model obtained by variable selection in multiple linear regression included stockD and duration with fed as a fixed effect. Based on a Bayesian framework, the 95% posterior probability intervals (PPIs) showed negative values for stockD (–32.75 to –23.36) and duration (–0.70 to –0.36), and positive values for fed (3.49 to 8.54). These results indicated that (1) stocking density was a primary factor, and higher stocking density reduced fish productivity, (2) longer stocking duration was less contributory to improving fish productivity compared with stocking density, and (3) feeding conditions improved fish productivity, which was suspected to support nutritional deficiency in the natural food items (e.g., aquatic insects, crustaceans) in paddies. Our findings suggested that fish productivity could be improved by lower stocking density, and that feeding had the potential to maintain high productivity with low stocking density and longer stocking duration.

作成者 Bounsong VONGVICHITH Shinsuke MORIOKA Kensuke KAWAMURA Atsushi MORI
著者キーワード rice-cum-fish low input indigenous fish Anabas testudineus
公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 359
終了ページ 366
DOI 10.6090/jarq.52.359
言語 eng