Temporal and spatial toxicogenetic damage in estuarine catfish Cathorops spixii from a marine protected area with evidence of anthropogenic influences.

Taking action to contribute to the preservation of the natural coastal environment, which maintains a diversity of life, is important in today's world. In estuarine ecosystems that are included in marine protected areas (MPA), it is important to conduct biomonitoring over time to monitor the effects of xenobiotics on bioindicator species such as the catfish Cathorops spixii. This study aims to evaluate the toxicogenetic signals in C. spixii from a MPA (Cananéia-Iguape region, Brazilian coast). These genotoxic signals are demonstrated by the presence of micronuclei (MN) and abnormalities in erythrocytes (AE). This study also takes into account the environmental differences signaled by the water's properties (temperature, salinity, pH, DO, dissolved nutrients, and particulate material) over time (2009, 2014, 2017, and 2018). The results show that in the northern region of the estuary, and mainly in 2009, the water properties reveal the influence of the river in the form of the lowest levels of salinity and pH and the highest levels of nutrients. The most significant levels of suspended particulate material and chlorophyll-a are found in the southern region of the estuary, mainly in 2017 and 2018. In general, the C. spixii from the northern region had better well-being than catfish from the more preserved (southern) region. The data on MN and AE show evidence of toxicogenetic damage occurring over time and clastogenic/aneugenic effects mainly in fish sampled in 2018. The presence of a new AE, first recorded in C. spixii sampled in 2018, and named here as double bubbled, is another indicator of toxicogenetic effects. Finally, although the southern region of the estuary has better abiotic properties and conditions for primary production, the obtained toxicogenetic data for C. spixii reinforces the need for - and encourages the implementation of - monitoring actions in this marine protected area using bioindicator species of contamination.

The first report of abnormal age rings in otoliths Lapillus of ariids catfish / Primeiro registro de aneis etários anormais em otólitos Lapillus de bagres arídeos

The present work aimed to record the first presence of abnormal age rings in Cathorops spixii lapillusotoliths from Cananeia-Iguape Estuarine-Lagoon Complex (CIELC), Southern region of Brazilian coast. In August 2018, 59 specimens of C. spixii (Siluriformes, Ariidae) were collected during one station sampling in the northern (n = 25) and another in the southern sector (n = 33) of CIELC. In general, among the otoliths that presented age ring alterations, this divergent zone was observed in opaque and translucent layers, on the right side, between the fifth and seventh age rings.

O presente trabalho teve por objetivo apresentar o primeiro relato de anéis etários anormais nos otólitos lapillus de Cathorops spixii do Complexo estuarino-lagunar de Cananéia-Iguape (CELCI), região sul do litoral brasileiro. Em agosto de 2018, 59 espécimes de C. spixii (Siluriformes, Ariidae) foram coletados durante uma estação de amostragem no setor norte (n = 25) e outra no setor sul (n = 33) do (CELCI). Em geral, entre os otólitos que apresentavam alterações nos anéis de idade, essa zona divergente foi observada em camadas opacas e translúcidas, do lado direito, entre o quinto e o sétimo anéis de idade.

The first report of abnormal age rings in otoliths Lapillus of ariids catfish / Primeiro registro de aneis etários anormais em otólitos Lapillus de bagres arídeos

The present work aimed to record the first presence of abnormal age rings in Cathorops spixii lapillusotoliths from Cananeia-Iguape Estuarine-Lagoon Complex (CIELC), Southern region of Brazilian coast. In August 2018, 59 specimens of C. spixii (Siluriformes, Ariidae) were collected during one station sampling in the northern (n = 25) and another in the southern sector (n = 33) of CIELC. In general, among the otoliths that presented age ring alterations, this divergent zone was observed in opaque and translucent layers, on the right side, between the fifth and seventh age rings.(AU)

O presente trabalho teve por objetivo apresentar o primeiro relato de anéis etários anormais nos otólitos lapillus de Cathorops spixii do Complexo estuarino-lagunar de Cananéia-Iguape (CELCI), região sul do litoral brasileiro. Em agosto de 2018, 59 espécimes de C. spixii (Siluriformes, Ariidae) foram coletados durante uma estação de amostragem no setor norte (n = 25) e outra no setor sul (n = 33) do (CELCI). Em geral, entre os otólitos que apresentavam alterações nos anéis de idade, essa zona divergente foi observada em camadas opacas e translúcidas, do lado direito, entre o quinto e o sétimo anéis de idade.(AU)