Research
| Title： | Reproductive Characteristics of Odontobutis potamophila: Implications for Sustainable Fisheries Management |
|---|---|
| First author： | Xiang, Miao; Zhao, Shasha; Li, Bo; Li, Li; Wang, Man; Wang, Jie; Lin, Ruru; Zhang, Lei |
| Journal： | ANIMALS |
| Years： | 2025 |
| DOI： | 10.3390/ani15213150 |
| Abstract： | Simple Summary A one-year study of Odontobutis potamophila in Nansi Lake found that this species matures at one year and around 73.6 mm, spawns primarily from March to June (peaking in May), and depends on individuals aged two years and older for more than 80% of total egg production. To promote sustainable populations, we recommend implementing a seasonal fishing closure from March to June, establishing a minimum catch size of 80 mm, and utilizing peak GSI values in May to optimize hatchery operations. These measures aid in conserving this ecologically significant benthic fish during crucial reproductive phases.Abstract Odontobutis potamophila, a small benthic carnivorous fish endemic to the Yangtze River basin, holds considerable ecological and commercial value. However, overfishing and habitat degradation have led to a severe decline in its wild population. A lack of quantitative reproductive data has further hampered effective conservation and resource management. To address this, we conducted monthly sampling, collecting a total of 894 individuals from Nansi Lake between August 2017 and July 2018. By integrating gonadal histological staging, gonadosomatic index (GSI) analysis, logistic regression, and fecundity assessments, we provide a foundational understanding of the species' reproductive biology. The annual sex ratio was 1.06:1, with a temporary female bias in April (2.14:1) shifting due to male nest-guarding behavior. Both sexes reached maturity at one year and approximately 73.6 mm in length. Spawning occurred from March to June, peaking in May (GSI = 28.92%). Absolute fecundity ranged 2306 +/- 1430 eggs and correlated positively with body size and age, while relative fecundity stabilized after age two. Individuals aged two years and older contributed over 80% of total egg production, reflecting a strategy of early maturation with high reproductive output at older ages. This study aims to systematically understand the reproductive biology of O. potamophila. These results support science-based measures such as Covering the entire window from gonadal maturation to fry dispersal, an annual fish ban established from March to June, a minimum catch size of 80 mm, and improved broodstock management for aquaculture and conservation efforts aimed at this and related benthic fishes in shallow lake ecosystems. |
