Ciclo reproductivo del ostión de manglar Crassostrea rhizophorae (Bivalvia: Ostreidae) en la Bahía de Camamu, Bahia, Brasil

Abstract

Reproductive cycle of the mangrove oyster Crassostrea rhizophorae (Bivalvia: Ostreidae) in Camamu Bay, Bahia, Brasil. The mangrove oyster Crassostrea rhizophorae is important fishery resource along the entire Brasilian coast with excellent potential for marine culture. The purpose of this paper was to examine the reproductive characteristics of the oyster of the Maraú river estuary in Camamu Bay, Bahia, Brasil. The samples were collected monthly, from September 2006 to August 2007, at two points (I and II) in Camamu Bay. At each site 20 oysters were collected for histological analysis, fixed in Davidson's solution, embedded in paraffin, dehydrated in an ethanol series, sectioned (7µm thick) and stained with Harris hematoxylin and Eosin (HE). Additionally, 30 oysters were sampled, at each point, for a condition index analysis. The water temperature ranged from 23.5°C to 30°C and the salinity from 15 to 25 ups at Point I (Maraú) and from 25 to 35 at Point II (Tanque Island). The oyster's height ranged from 30 to 92mm at Point I and from 27 to 102mm at Point II, with an average of 49.0mm±9.1 (n=230) and 49.9mm±9.9 (n=237), respectively. Among the sampled oysters at Point I, 59.1% were females, 31.3% males, 1.3% hermaphrodites and 8.2% of the oysters of undetermined sex. At Point II, 66.2% were females, 30.4% males, 0.8% hermaphrodites and 2.5% (n=237) of undetermined sex. The gonadic stage analysis indicated that the reproduction period of the C. rhizophorae in the Maraú Peninsula was continuous all year, without any regressive phase. The condition index (R) ranged from 8.0% to 17.7%. The peak periods of R coincided with the expressive oyster's percentage in the maturation and liberation gametic stages. The results of these findings will contribute information for the oyster spat collection and to the process installation of the oyster culture in Camamu Bay. Rev. Biol. Trop. 59 (1): 137-149. Epub 2011 March 01.

Reproduction of Cortez oyster, Crassostrea corteziensis (Hertlein, 1951) in a growing area in the central Mexican Pacific coast

“…This finding is similar to that reported by several authors in oysters of the genus Crassostrea (Rodríguez-Jaramillo et al, 2008;Lenz & Boehs, 2011). The age and size of the (Vélez, 1991).…”

“…In this work, it was found a 1.3% hermaphroditic specimens in May, which is the month of greatest reproductive activity for C. corteziensis, at La Palicienta Lagoon. The proportion of hermaphrodites (1.5%) is similar to that reported for this species in other areas of distribution (Chávez- et al, 2003), and C. rhizophorae (0.8 to 1.3%) (Lenz & Boehs, 2011). These authors attribute hermaphroditism to the age of specimens and to environmental stimuli; however, Paniagua-Chávez & Acosta-Ruíz (1995) attributed this to the fact that in hermaphroditism, complete removal and reabsorption of gametes of the most recent reproductive cycle and new gametogenesis do not occur.…”

The reproductive cycle of the oyster Crassostrea gasar

“…The incidence of hermaphrodites in a population of C. brasiliana was 0.6% (Galvão et al, 2000). Comparable results were reported by Nascimento (1978) and by Lenz and Boehs (2011), who reported low incidence rates of 0.52 and 0.76%, respectively, for hermaphroditic C. rhizophorae. Shpigel (1989) observed that the males of C. gigas and Ostrea edulis (Linnaeus, 1758) become mature earlier than the females.…”

“…Partial spawns, followed by a recovery phase, are more frequent throughout the year. Lenz and Boehs (2011) studied the reproductive biology of C. rhizophorae in two environments in the Bay of Camamu (BA) and found that these oysters were in different stages of the reproductive cycle throughout the year. It is likely that the reproductive cycle of oysters in these regions is less subject to seasonal influences than it would be in the South and Southeast, where the oysters would be more susceptible to other environmental events, such as rainfall.…”

Reproductive cycle of Tagelus plebeius (Mollusca: Bivalvia) in the estuary of the Cachoeira River, Ilhéus, Bahia, Brazil

“…Information is available for Donax hanleyanus Philippi, 1847 (Gil and Tomé, 2004a), Chione pubera (Bory Saint-Vicent, 1827) (Borzone et al, 2001), Perna perna (Linnaeus, 1758) (Galvão et al, 2006), Anomalocardia brasiliana (Gmelin, 1791) (Narchi, 1976;Grotta and Lunetta, 1980;Barreira and Araújo, 2005;Luz and Boehs, 2011) and Crassostrea rhizophorae (Guilding, 1828) (Nascimento and Lunetta, 1978;Nascimento et al, 1980;Lenz and Boehs, 2011).…”