e-ISSN:2528-0759; p-ISSN:2085-5842 JIPK. Volume 14 No 2. November 2022 DOI=10.20473/jipk.v14i2.34629 Sinta 1 (Decree No: 158/E/KPT/2021) Available online at https://e-journal.unair.ac.id/JIPK/index Research Article Morphoregression and Reproduction Aspect of Bonylip Barb (Osteochilus vitattus Valenciennes, 1842) in Tamblingan Lake, Bali Island I Nyoman Y. Parawangsa 1* , Gede Arya Kusuma Artha 2 , and Prawira Atmaja Tampubolon 1,3 1 Program Study of Aquatic Resources Management, Faculty of Agriculture, Warmadewa University, Denpasar, Bali, 80239. Indonesia 2 Program Study of Aquatic Resources Management, Faculty of Marine Sciences and Fisheries, Udayana University, Badung, Bali, 80361. Indonesia 3 Research Center for Fishery, National Research and Innovation Agency, Bogor, West Java. Indonesia ARTICLE INFO Received: March 28, 2022 Accepted: April 27, 2022 Published: May 10, 2022 Available online: August 30, 2022 *) Corresponding author: E-mail: inymyparawangsa@gmail.com Keywords: Fork Length Isometric Reproduction Tamblingan Lake This is an open access article un- der the CC BY-NC-SA license (https://creativecommons.org/li- censes/by-nc-sa/4.0/) Cite this as: Parawangsa, I. N. Y., Artha, G. A. K., & Tampubolon, P. A. (2022). Morphoregression and Reproduction Aspect of Bonylip Barb (Osteochilus vitattus Valenciennes, 1842) in Tamblingan Lake, Bali Island. Jurnal Ilmiah Perikanan dan Kelautan, 14(2):272-284. http://doi.org/10.20473/jipk.v14i2.34629 Copyright ©2022 Faculty of Fisheries and Marine Universitas Airlangga 272 JIPK (JURNAL ILMIAH PERIKANAN DAN KELAUTAN) Scientifc Journal of Fisheries and Marine Abstract Bonylip barb (Osteochilus vitattus Valenciennes, 1842) is one of many native fsh inhabiting Tamblingan Lake. The information about this species in Tamblingan Lake is rare which requires fulflment in information gaps for the management of bonylip barb. The aims of this research were to fnd out the length-length relationship, length-weight relationship, length at frst maturity, sex ratio, gonadal maturity stage, gonadosomatic index (GSI), fecundity, as well as spawning period and location in Tamblingan Lake. The fsh sample was captured with experimental gillnet that was set in the afternoon and hauled in the next morning. Length and weight of every sample were taken. All samples were dissected to observe the sex and gonad. Fork length was the type of length with higher accuracy to estimate the body weight than the other length character. Growth pattern of this species was isometric. Lm 50 of bonylip barb in Tamblingan Lake was 116 mmTL. Sex ratio of bonylip barb was imbalanced (1.00:0.82). Gonad maturity stage I-V was found during the research with GSI between 0.16-15.50 for male fsh and 0.43-32.82 for female fsh. The highest GSI was found in March, 15.50 for male fsh and 32.73 for female fsh. Mature fsh were discovered in all stations in every month of sampli- ng. The fecundity of bonylip barb ranged between 2,792-279,326 eggs. The leng- th-length and the length-weight showed a strong relationship. The fsh was isome- tric. Based on the growth pattern and the reproductive aspects, the population of bonylip barb in Tamblingan Lake was in good condition.