Growth of the Anchovy Anchoa tricolor in a brazilian subtropical estuary

Abstract

This study aimed to describe the growth parameters of Anchoa tricolor in a subtropical estuary. From August 2010 to July 2011, 10.009 specimens of the anchovy Anchoa tricolor, mean total length 4.2 cm (±1.45), were captured in the intertidal region of the Estuarine Complex of Paranaguá (25º 15' - 25° 35' S and 48° 20' - 48° 45' W). Species´s weight/length relationship for grouped genders was described as follow: W = 0.0000591.Lt3.282 (length in centimeters; weight in grams) showing a positive allometric growth pattern (b>3; P=0.000). Significant differences concerning weight/length relationship for males, females and unsexed individuals were identified. Parameters of the length to age growth curve were estimated by adjusting a von Bertalanffy growth equation from aged individuals from a length-frequency distribution: L∞ = 10.06 (1-e-17715(t + 0.205)) (length in centimeters, age in years). The age to attain 95% of the asymptotic length ( A95 ; longevity sensu Taylor) was estimated at 1.7 years. Size frequency distributions indicate that A. tricolor uses the estuarine area as reproductive and growing grounds, especially during the first year of the life cycle, where the species represent a key element for ecosystem functioning due to relatively high abundance and energy transference from plankton to top predators.

Spatiotemporal distribution and population biology aspects of Cetengraulis edentulus (Actinopterygii: Clupeiformes: Engraulidae) in a South-western Atlantic estuary, with notes on the local Clupeiformes community: Conservation implications

“…Osório Duabily and Báez Hidalgo (2002b) and Souza-Conceição and Schwingel (2011) demonstrated that Cetengraulis edentulus has a short life cycle. While the k values for other engraulids (Carvalho et al 2018) may be higher than the one reported herein, this value corroborates the expected for a small pelagic species. Clupeiformes community of Guanabara Bay.…”

Reproductive pattern and population dynamics of Anchovia surinamensis in a seasonal floodplain lake of the Amazon basin

“…When the estimated the growth rate (k = 0.70 year -1 ) and longevity (A 0.95 = 4.28 years -1 ) of the population of A. surinamensis of the Cujubim Lake were observed, it was found that these values were similar to those reported by Carvalho et al (2018) for Anchoa mitchilli (k = 0.60, A 0.95 = 4.6 year -1 ) and to data from Fishbase (Froese and Pauly, 2021) for Anchoa spinifer (k = 0.63, A 0.95 = 4.6 year -1 ). Both species were caught at the Western Atlantic.…”