Gonadal cycle of the dwarf oyster<i>Ostreola stentina</i>from the south of the Gulf of Hammamet on the eastern coast of Tunisia

Salah, Ines Ben; Bouaïn, Abderrahmen; Neifar, Lassad

doi:10.2989/1814232x.2012.689621

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…In fact, histological sections showed that individuals of about 20 mm featured hermaphroditism with alternating sex, which is consistent with observations reporting that O. edulis may produce eggs even in the first year of life (see review by Cole, 1942). Our results also showed a primary female development in the examined individuals, which is contrary to the protandric hermaphroditism often described for O. edulis (e.g., Kamphausen et al, 2011;Joyce et al, 2013) and for O. stentina (Salah et al, 2012). Yet, distinctive groups of adult spawners, one first acting as females with considerably larger brood strength, and other acting first as males and producing a lower number of ripened eggs due to partially spent reserves have been also indicated for O. edulis (Cole, 1942).…”

Section: Discussionsupporting

confidence: 91%

Molecular identification, life cycle characterization, and hatchery seed production of dwarf oysters from the Ebro Delta (Spain)

Prado

Fernández-Tejedor

Cordero

et al. 2022

Aquat. Living Resour.

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Dwarf oysters in the Ebro Delta are only observed growing on local pen shells, Pinna nobilis L., currently under extinction risk. The species identification of these populations is uncertain, given recent genetic classifications of dwarf oysters of Ostrea stentina species complex. Hence, the first objective of this study was to confirm the identity of dwarf oysters associated to P. nobilis in the Ebro Delta. Then, we aimed to assess the viability of hatchery and nursery production of O. stentina for potential conservation programs using diets based on a mix of live microalgae species or the commercial Shellfish Diet 1800®. Our results showed that COI sequences obtained were specific to O. stentina. Significant differences in the growth and survival of larvae between diet treatments were observed in 3 days. For the live diet, the larval period lasted from 15 to 22 days (299.2 ± 4 µm) whereas it took up to 36 days using the Shellfish Diet 1800® (280 ± 7.2 µm), with an overall mortality of 72.3 vs. 99.3%, respectively for each diet. Besides, no seed survival was observed for the commercial diet after a 10-day-fixation attempt. In contrast, ca. 16% of the individuals on the live diet that were allowed to settle reached the juvenile stage and could be released to the environment. Histological examination of obtained seed did not present any sign of disease and showed gonadal development for both sexes at ca. 6 months of age (16.1–19.1 mm). The growth curve obtained was fitted to a Schnute-Richards growth model which returned ages of up to 10 years for maximum local sizes of 45 mm. We conclude that although the Shellfish Diet 1800® is not an adequate diet for O. stentina, its hatchery production is feasible and might provide support to future conservation actions.

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Section: Discussionsupporting

confidence: 91%

Molecular identification, life cycle characterization, and hatchery seed production of dwarf oysters from the Ebro Delta (Spain)

Prado

Fernández-Tejedor

Cordero

et al. 2022

Aquat. Living Resour.

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“…Similar increase and decrease in GSI values in maturity and spawning were well documented (Cantillanez et al, 2005;Mouneyrac et al, 2008;Morillo-Manalo et al, 2016). Among bivalves, GSI has been used to assess and monitor the development of gonad (Lucas and Beninger, 1985;Lagade et al, 2014) because it is an easy and fast method to identify gonad stages rather than the use of histological analysis (Mouneyrac et al, 2008;Ben Salah et al, 2012).…”

Section: Discussionmentioning

confidence: 59%

“…Bivalves are known to undergo an annual reproductive cycle that involves gametogenesis followed by either a single or several spawning events, which are in turn followed by a period of gonad reconstitution (Crnčević et al, 2013). Some bivalves have unimodal or bimodal type of spawning which means they could either have a single spawning activity or have two spawning periods within a year (Mouneyrac et al, 2008;Ben Salah et al, 2012;Sawant and Mohite, 2013;Morillo-Manalo et al, 2016). However, Rai (1932) opined that under favourable condition spawning will occur throughout the year.…”

Section: Discussionmentioning

confidence: 99%

Lunar periodicity in reproduction of two venerid clams Meretrix meretrix and Katelysia hiantina in Panguil Bay, Northern Mindanao, Philippines

Keith¹,

Juranes²,

Metillo³

2018

Int. J. Biosci.

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The venerid clams Meretrix meretrix and Katelysia hiantina are important component of shallow benthopelagic estuarine ecosystems, fisheries and cuisine in the Indo-West Pacific region. The uncontrolled and regular harvesting of these species may lead to population decline. Studies on aspects of growth and reproductive biology are indispensable input to the rational management of the clams. In this study, we examined lunar periodicity in growth through gross morphology measurements and reproductive potential of the two coexisting venerid species M. meretrix and K. hiantina from inner Panguil Bay, Philippines. For each clam species, thirty live samples per lunar phase sampling were collected during low tide from gleaners in situ from March to May 2017. Clams were individually measured for body length, width, inflation, and total weight, and dissected to obtain gonadosomatic index and fecundity that was estimated through volumetric method. Results showed no significant difference in growth for both clam species during each lunar phase. In contrast, significant differences were found for both fecundity and GSI for the two species to lunar phases. Furthermore, both species showed unimodal and bimodal peak for fecundity and GSI, with maximum values of M. meretrix peaking during new moon and full moon while those of K. hiantina only during full moon. We attribute these differences in GSI and fecundity peaks to reproductive niche differences of the two coexisting species in the brackish area of inner Panguil Bay. Hence, this study gives insight into the reproductive biology and potential for fisheries production of the studied venerid clams.

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“…Selain itu, siklus reproduksi juga berhubungan dengan perubahan suhu perairan yang ditunjukkan pada kerang M. lusoria yang mengalami peningkatan perkembangan gonad diawali pada musim semi, kematangan pada musim panas dan pemijahan terjadi pada akhir musim panas/awal musim gugur (Nakamura et al 2010). Selain itu beberapa parameter kualitas perairan yang berhubungan dengan gametogenesis kerang di antaranya suhu, salinitas, makanan, nutrisi dan lokasi geografis (Enriquez-Diaz et al 2009;Serdar dan Lok, 2009) Perubahan IKG merupakan petunjuk adanya aktivitas gametogenik kerang dalam siklus reproduksi (Mouneyrac et al 2008;Morillo-Manalo et al 2016;Bahtiar et al 2021) atau dapat pula dikatakan bahwa IKG dapat digunakan untuk menilai dan memantau perkembangan gonad (Lagade et al 2015) secara cepat dibandingkan analisis histologis (Ben Salah et al 2012). Nilai IKG matang gonad (didominasi kematangan III dan IV) yang ditunjukkan oleh kerang tahu di muara Sungai Kambu dalam setiap bulan umumnya berada pada nilai IKG tinggi berkisar 39 sampai 46.…”

Section: Pembahasanunclassified

The Reproduction of Meretrix meretrix Clams in The Kambu River Estuary, Southeast Sulawesi

Bahtiar

Purnama

Rahmadhani

et al. 2023

JPPT

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Meretrix meretrix is a degraded resource in Kendari Bay waters, but its reproductive pattern is not fully known.. This study aims to determine the level of gonad maturity, gonadal maturity index, fecundity and the size of the first gonad maturity of M. meretrix at the Kambu River estuary, Kendari Bay, Southeast Sulawesi. This research was carried out at the Kambu River estuary for 6 months from August 2021-January 2022. These clams were taken randomly representing all size classes as many as 300 birds during the study. M. meretrix were observed for gonad color and gonad development microscopically, then the length and weight of the gonads were measured using a caliper and analytical balance with an accuracy of 0.5 mm and 0.0001g, respectively. The results showed that the development of male and female gonads was relatively simultaneous, which was dominated by mature gonads (III-IV) in each month of observation. TKG I-V was found in every month of observation. The gonad maturity index of males and females were 4.92-6.00 and 5.53-6.32, respectively. The fecundity of M. meretrix ranged from 4882-85677 grains. The first mature size of the gonads of male and female M. meretrix is 20 mm.

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Gonadal cycle of the dwarf oysterOstreola stentinafrom the south of the Gulf of Hammamet on the eastern coast of Tunisia

Cited by 5 publications

References 24 publications

Molecular identification, life cycle characterization, and hatchery seed production of dwarf oysters from the Ebro Delta (Spain)

Molecular identification, life cycle characterization, and hatchery seed production of dwarf oysters from the Ebro Delta (Spain)

Lunar periodicity in reproduction of two venerid clams Meretrix meretrix and Katelysia hiantina in Panguil Bay, Northern Mindanao, Philippines

The Reproduction of Meretrix meretrix Clams in The Kambu River Estuary, Southeast Sulawesi

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