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The rock goby Gobius paganellus is one of the most common gobiid fish on the southern Tunisian coast and this study provides the first detailed information on its reproductive biology in the Gulf of Gabes. A total of 356 males (8.9–14 cm total length, TL) and 273 females (9.1–14.3 cm TL) were analyzed. Specimens were dissected and their gonads and livers were removed. Mean size at sexual maturity (TL50; i.e., length at which 50% of the fish are mature) was estimated for males and females by fitting the logistic Gompertz function to the proportion of mature fish per centimeter size class. The gonadosomatic index, the seminal vesicle-somatic index (SVSI), the hepatosomatic index, and the condition index were calculated on a monthly basis. In the entire population, the sex ratio was unbalanced, males dominating among larger size classes. The reproductive period started in October and lasted until March, and the spawning season was between January and March. Monthly changes in the SVSI showed that during the pre-spawning period they have a proliferation phase, followed by a regressive phase during the post-spawning period. The use of lipid reserves, stored predominantly in the liver as well as in muscles, was important during the reproductive season. The estimated length at sexual maturity was 11.44 ± 0.25 cm for males and 10.37 ± 0.23 cm for females. Total fecundity ranged from 5280 to 14,320 eggs per fish, with an average of 8565 ± 608 eggs per fish.   El gobio de roca Gobius paganellus es uno de los gobidos mas comunes en la costa del sur de Tunez y este estudio proporciona la primera informacion detallada de su biologia reproductiva en el golfo de Gabes. Se analizaron un total de 365 machos (8.9–14 cm de longitud total, LT) y 273 hembras (9.1–14.3 cm LT). Los peces fueron disecados y se retiraron las gonadas y el higado. Se estimo la talla media de madurez sexual (LT50; i.e., la longitud a la cual el 50% de los individuos han alcanzado la madurez sexual) para machos y hembras mediante el ajuste de la funcion logistica de Gompertz a la proporcion de peces maduros en cada clase de talla. Se calcularon el indice gonadosomatico, el indice somatico de las vesiculas seminales (SVSI), el indice hepatosomatico y el indice de condicion sobre una base mensual. En toda la poblacion, la proporcion de sexos fue desequilibrada, los machos dominando en las tallas mayores. El periodo de reproduccion comenzo en octubre y duro hasta marzo y la temporada de desove fue de enero a marzo. Las variaciones mensuales del SVSI mostraron que tienen una fase de proliferacion durante el periodo de predesove y una fase regresiva durante el periodo de posdesove. La utilizacion de reservas lipidicas, almacenadas principalmente en el higado asi como en los musculos, fue considerable durante la temporada de reproduccion. La talla de madurez sexual se estimo en 11.44 ± 0.25 cm para los machos y en 10.37 ± 0.23 cm para las hembras. La fecundidad total vario de 5280 a 14,320 huevos por individuo, con un promedio de 8565 ± 608 huevos por individuo.

Reproductive biology of the rock goby, Gobius paganellus (Actinopterygii: Perciformes: Gobiidae), on the southern Tunisian coast (Gulf of Gabes)