Some biological parameters of the thin-lipped mullet Liza ramada (Pisces, Mugilidae) in the Neretva River delta (Eastern Adriatic, Croatian coast)

Abstract

International audienceAspects concerning age, growth, reproduction and recruitment were analysed inthe thin-lipped mullet, Liza ramada, collected in Neretva River delta estuary (East A d r i a t i c ,Croatian coastline). The study was based on the collection of a total of 362 individuals on amonthly basis. The von Bertalanffy growth curve parameters were estimated: T L= 59.96 cm,K = 0.269 year- 1, t0= -0.455. Natural mortality was estimated at 0.32 year- 1. Total mortality (Z)was estimated at 0.70 year- 1(range 0.55-0.85 year- 1). Fishing mortality was estimated at0.38year-1and the exploitation ratio at E = 0.54. The gonado-somatic index profile shows a sin-gle peak during the year in October. The sex ratio profile shows skewed sex ratios throughoutthe year except the period prior to reproduction peak. This L. ramadapopulation is suggested tobe in good status