How are the oocytes recruited in an indeterminate fish? Applications of stereological techniques along with advanced packing density theory on European hake (Merluccius merluccius L.)

Dynamics of de novo vitellogenesis in fish with indeterminate fecundity: an application of oocyte packing density theory to European anchovy, Engraulis encrasicolus

“…In controlled laboratory experiments in which days from spawning were known and using a combination of stereological analysis and measurements of serum sex steroid levels, Coward and Bromage (1998) concluded that previtellogenic oocytes in Tilapia zillii are recruited into vitellogenic growth immediately after spawning and can complete vitellogenesis as early as day-8 post-spawning. Recently, Korta et al (2010) studied batch recruitment in field-caught European hake (Merluccius merluccius) by applying the oocyte packing density formula developed by Kurita and Kjesbu (2009). The formula was based on the extension of the auto-diametric method, originally developed for fecundity estimations in determinate spawners (Thorsen and Kjesbu 2001;Witthames et al 2009).…”

Reproductive strategies of the marine fishes from the southwest Atlantic Ocean: an application of histological and image processing techniques

“…Korta et al (2010b) and Saber et al (2014) have reported similar result for fishes with indeterminate fecundity. Therefore, the asynchronous oogenesis with no gap between the pre-vitellogenic and vitellogenic modes in the oocyte size-frequency distribution are associated with multiple spawning fishes, and this represents a strategy for investment of large numbers of oocytes when resources are patchy (WINEMILLER;ROSE, 1993;.…”

“…This is corroborated by the analysis of the oocyte sizefrequency distribution, which showed continuous modes from primary growth through the most advanced stage in each ovarian phase. The relationship between the mean oocyte diameter and the volume-based oocyte diameter by stage in studies of oocyte packing density theory (OPD) applied to indeterminate species show a similar pattern (KURITA; KORTA et al, 2010b;SCHIMENOU et al, 2012).…”

“…In these fishes, oocyte recruitment may occur either before the beginning or during the spawning period (KORTA et al, 2010b). Extended spawning in fishes with indeterminate fecundity is linked with the ability to continually recruit oocytes into vitellogenesis (RIDEOUT; TOMKIEWICZ, 2011).…”

“…Therefore, using oocytes in advanced development stages for understanding the evolution of reproductive life history traits in fishes must be biased. Thus, underlying production of oocyte and recruitment are still poorly understood, mainly due to the difficult for quantifying the pre-vitellogenic oocytes using traditional methods KORTA et al, 2010b;GANIAS et al, 2015).…”