Population dynamics of Scomberomorus brasiliensis from a small-scale fishery off Southern Brazil
Scomberomorus brasiliensis is the most important fish species of the small-scale fishery off the southwestern Atlantic north of the La Plata estuary. For management purposes, this study evaluated their reproductive biology, size, age and growth along the Paraná coast. Monthly samples (March 2018-Ju...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Instituto Oceanográfico da Universidade de São Paulo
2024-04-01
|
| Series: | Ocean and Coastal Research |
| Subjects: | |
| Online Access: | https://journals.usp.br/ocr/article/view/224228 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Scomberomorus brasiliensis is the most important fish species of the small-scale fishery off the southwestern Atlantic north
of the La Plata estuary. For management purposes, this study evaluated their reproductive biology, size, age and growth
along the Paraná coast. Monthly samples (March 2018-June 2020) from the fishery comprised 933 specimens (413 males,
520 females), 210-779 mm fork length, corresponding to a size smaller than in the northern areas. It presented negative
allometry (b = 2.69159, length-weight relationship). Specimens in all stages of maturity occurred during the study period,
indicating spawning in the area from October to June, peaking from January to March. The gonad–length relationship was
suitable to confirm this assessment. Individual fecundity varied between 34,484 and 390,786 oocytes. Maturity occurred
at L50 = 446.46 mm, t50 = 1.4 years, and L100 = 588.79 mm, and t100 = 2.3 years. The growth parameters were L∞ = 771.68 mm,
k = 0.65 year-1 and t0
= -0.102 years, with cohorts aged from 0.5 to 6.5 years. Scomberomorus brasiliensis along the Paraná
coast constitutes a self-sustaining group, not directly related to that from northeastern Brazil. This small-scale fishery is not
currently negatively affecting stock level; it is essential to monitor these attributes to detect future changes or impacts.
|
|---|---|
| ISSN: | 2675-2824 |