Migration and reproductive biology of Mugil liza (Teleostei: Mugilidae) in south Brazil

Abstract

The mullet Mugil liza occurs along the Atlantic coast of South America from Venezuela to Argentina, but 95% of the commercial catch is collected from south Brazil between São Paulo and Argentina. Mugil liza is a single spawner with oocyte development occurring synchronously in two groups. Spawning happens in marine areas and occurs after migration. The reproductive migration occurs from Argentina (38° S) to the southern Brazilian states (24-26° S) from April to July, with peak spawning in June between northern Santa Catarina and Paraná. The presence of hyaline oocytes was associated with high salinity and sea surface temperatures of 19-21° C, and followed the seasonal northward displacement of these oceanographic conditions. The average size at first maturity (Lm ) for both sexes was 408·3 mm total length, LT . Males (Lm = 400·1) matured earlier than females (Lm = 421·9 mm). Fecundity ranged from 818,992 to 2,869,767 oocytes (mean = 1,624,551) in fish that were between 426 and 660 mm LT .

Reproductive Biology of Keeled Fish <i>Liza Carinata</i> (Valenciennes, 1836) from Suez Bay, Egypt

“…Concluded from these results in the present work that females L. carinata reach sexual maturity at larger size than the males, similar to the result of (Hoda and Qureshi, 1989) on the same species from Pakistan and (Abou-Seedo and Stephen, 2004) from Kuwaiti waters, and with slight decrease from (Hakimelahi et al, 2011) which recorded L50 for female of L. klunzingeri at (15.4 cm), but with slight increase from (Lawson et al 2010) which recorded L50 for (males -females) at (11.6 -12.1 cm), respectively. It is implied as it is also evident from the current study that males mature earlier therefore their growth in slower that female's similar result recorded by ( Lembros et al, 2014;El-Ganainy et al, 2014). As a result of the high energy they need in earlier (Raiaguru, 1992), this result with a complete agreement with that reported by (Abou-Seedo and Stephen, 2004;Javadzadeh, 2004;Hashemi et al, 2013) for the same species and for Mugil liza.…”

Feeding ecology of the common bottlenose dolphin, Tursiops truncatus, in southern Brazil: analyzing its prey and the potential overlap with fisheries

“…Based on these historical changes, the increase in the landings of mullet in southern Brazil in recent years is also of concern and may also lead to a future change in the diet composition of bottlenose dolphins. The fishing pressure on grey mullet (M. liza) has been even higher, since they are harvested mostly in their main spawning areas during the migration of the southern populations (LEMOS et al, 2014). In fact, overexploitation is considered to constitute a severe threat to this species in southern Brazil where the stock is feared to be on the edge of collapse (CASTRO et al, 2015).…”

Bayesian state-space models with multiple CPUE data: the case of a mullet fishery

“…This species is often considered to be catadromous, owing to its predictable migrations from freshwater and estuarine habitats into marine spawning areas, with its reproductive period from April to July and peak spawning in June in the southern states of Brazil (Santa Catarina and Paraná) Scalabrin 1991, Lemos et al 2014). This is also one of the most frequent and abundant fish species in the south and southeast regions of Brazil, representing an important cultural and historical artisanal fishery for this region (Seckendorff and Azevedo 2007, Vieira et al 2008, Lemos et al 2014. Because of the high value of mullet gonads in the international market, the industrial and artisanal fisheries have directed their fishing effort towards supplying these markets (Pina and Chaves 2005.…”