Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil
The age and growth of <i>Urotrygon microphthalmum</i> were studied using specimens captured between March 2010 and March 2012 as by-catch in the shrimp trawl fishery off the coast of the state of Pernambuco, Brazil. A total of 347 vertebrae were read, 161 from males (81.6–249.55 mm) and...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-03-01
|
| Series: | Fishes |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2410-3888/8/3/160 |
| _version_ | 1797611724957810688 |
|---|---|
| author | Jones Santander-Neto Francisco Marcante Santana Jonas Eloi Vasconcelos-Filho Rosângela Lessa |
| author_facet | Jones Santander-Neto Francisco Marcante Santana Jonas Eloi Vasconcelos-Filho Rosângela Lessa |
| author_sort | Jones Santander-Neto |
| collection | DOAJ |
| description | The age and growth of <i>Urotrygon microphthalmum</i> were studied using specimens captured between March 2010 and March 2012 as by-catch in the shrimp trawl fishery off the coast of the state of Pernambuco, Brazil. A total of 347 vertebrae were read, 161 from males (81.6–249.55 mm) and 186 from females (86.15–298.1 mm). The estimated average percentage index (IAPE) ranged from 0.71% to 4.33% (mean = 2.5%) in vertebrae from specimens with 1 and 6 band pairs, respectively. In the present study, the different approaches to validation produced variable results (partially valid growth zones). We then decided to discuss the growth of the species considering the formation of an annual ring. There were statistically significant differences in growth between the sexes. The best model to describe male growth was the von Bertalanffy growth model for two phases (VBGM TP) with growth parameters L<sub>∞</sub> (maximum theoretical length) = 230.35 mm, k (growth constant) = 1.00, t<sub>0</sub> (theoretical age of size zero) = −0.76 years and for females it was the von Bertalanffy with birth size (VBGM L<sub>0</sub>) model with parameters L<sub>∞</sub> = 282.55 mm, k = 0.37. The age of maturity for males and females was 1.52 and 2.02 years, respectively, and the maximum age observed was 5.5 and 8.5 years, respectively. Despite being a fast-growing species, <i>Urotrygon microphthalmum</i> is threatened, probably due to the high mortality levels from shrimp trawling in a very narrow range of the shelf where all the life stages are captured. |
| first_indexed | 2024-03-11T06:32:47Z |
| format | Article |
| id | doaj.art-38175830ba2b4644a323f72fdb3c3fc6 |
| institution | Directory Open Access Journal |
| issn | 2410-3888 |
| language | English |
| last_indexed | 2024-03-11T06:32:47Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fishes |
| spelling | doaj.art-38175830ba2b4644a323f72fdb3c3fc62023-11-17T11:04:26ZengMDPI AGFishes2410-38882023-03-018316010.3390/fishes8030160Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern BrazilJones Santander-Neto0Francisco Marcante Santana1Jonas Eloi Vasconcelos-Filho2Rosângela Lessa3Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo—Campus Piúma, Rua Augusto Costa de Oliveira, 660, Praia Doce, Piúma CEP 29285-000, ES, BrazilLaboratório de Dinâmica de Populações Aquáticas (DAQUA), Unidade Acadêmica de Serra Talhada (UAST), Universidade Federal Rural de Pernambuco (UFRPE), Serra Talhada CEP 56909-535, PE, BrazilLaboratório de Dinâmica de Populações Marinhas (DIMAR), Departamento de Pesca e Aquicultura (DEPAq), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife CEP 52171-900, PE, BrazilLaboratório de Dinâmica de Populações Marinhas (DIMAR), Departamento de Pesca e Aquicultura (DEPAq), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife CEP 52171-900, PE, BrazilThe age and growth of <i>Urotrygon microphthalmum</i> were studied using specimens captured between March 2010 and March 2012 as by-catch in the shrimp trawl fishery off the coast of the state of Pernambuco, Brazil. A total of 347 vertebrae were read, 161 from males (81.6–249.55 mm) and 186 from females (86.15–298.1 mm). The estimated average percentage index (IAPE) ranged from 0.71% to 4.33% (mean = 2.5%) in vertebrae from specimens with 1 and 6 band pairs, respectively. In the present study, the different approaches to validation produced variable results (partially valid growth zones). We then decided to discuss the growth of the species considering the formation of an annual ring. There were statistically significant differences in growth between the sexes. The best model to describe male growth was the von Bertalanffy growth model for two phases (VBGM TP) with growth parameters L<sub>∞</sub> (maximum theoretical length) = 230.35 mm, k (growth constant) = 1.00, t<sub>0</sub> (theoretical age of size zero) = −0.76 years and for females it was the von Bertalanffy with birth size (VBGM L<sub>0</sub>) model with parameters L<sub>∞</sub> = 282.55 mm, k = 0.37. The age of maturity for males and females was 1.52 and 2.02 years, respectively, and the maximum age observed was 5.5 and 8.5 years, respectively. Despite being a fast-growing species, <i>Urotrygon microphthalmum</i> is threatened, probably due to the high mortality levels from shrimp trawling in a very narrow range of the shelf where all the life stages are captured.https://www.mdpi.com/2410-3888/8/3/160elasmobranchmyliobatiformesbycatchlongevity |
| spellingShingle | Jones Santander-Neto Francisco Marcante Santana Jonas Eloi Vasconcelos-Filho Rosângela Lessa Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil Fishes elasmobranch myliobatiformes bycatch longevity |
| title | Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil |
| title_full | Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil |
| title_fullStr | Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil |
| title_full_unstemmed | Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil |
| title_short | Age and Growth of the Threatened Smalleye Round Ray, <i>Urotrygon microphthalmum</i>, Delsman, 1941, from Northeastern Brazil |
| title_sort | age and growth of the threatened smalleye round ray i urotrygon microphthalmum i delsman 1941 from northeastern brazil |
| topic | elasmobranch myliobatiformes bycatch longevity |
| url | https://www.mdpi.com/2410-3888/8/3/160 |
| work_keys_str_mv | AT jonessantanderneto ageandgrowthofthethreatenedsmalleyeroundrayiurotrygonmicrophthalmumidelsman1941fromnortheasternbrazil AT franciscomarcantesantana ageandgrowthofthethreatenedsmalleyeroundrayiurotrygonmicrophthalmumidelsman1941fromnortheasternbrazil AT jonaseloivasconcelosfilho ageandgrowthofthethreatenedsmalleyeroundrayiurotrygonmicrophthalmumidelsman1941fromnortheasternbrazil AT rosangelalessa ageandgrowthofthethreatenedsmalleyeroundrayiurotrygonmicrophthalmumidelsman1941fromnortheasternbrazil |