Aspects on the reproduction of eared horse mussel, Modiolus auriculatus (Krauss, 1848) in Red Sea, Egypt

Aspects of Reproductive Biology of the Mussel, Brachidontes Pharaonis (Fischer, 1870) (Mytilidae:bivalvia: Mollusca) From the Northwestern Coast of Suez Gulf, Egypt

“…The obtained results are in agreement with that mentioned by Radwan (2014) on the same species at the same localities which ranged between 5-10 mm shell length, but being slightly lower than that reported by Kandeel et al (2013) on Cerastoderma gluacum from Lake Qarun, Egypt which attained maturity between 8.5 and 9.6 mm for males and females, respectively. These findings are also in agreement with those reported by Galinou-Mitsoudi and Sinis (1994), and Abdel Razek et al (2014) on other bivalves. The onset of first maturation at this size class reflects effects of favorable conditions and stability of populations of this species at the studied areas.…”

“…While those unspawned ova were resorbed and have irregular shapes and size. The obtained results are in full agreement with those described by Nayar (1977) on general bivalves, Galinou-Mitsoudi and Sinis (1994) on Lithophaga lithophaga from Aegean Sea (eastern Mediterranean), Gab-Alla et al (2007) on Gafrarium pectinatum and Mactra olorina from northern parts of Suez Gulf, and Abdel Razek et al (2014) on Modiolus auriculatus from the Egyptian coasts of the Red Sea.…”

“…However, these ratios are not stable and showed monthly variations, revealing increasing male numbers in January at both sites and only through June and September at Adabia. On the other hand, female numbers were higher in most months during the course of this study, as well as are higher than those reported by Abou Zied (1991), Gab-Allah, et al (2007), Park et al (2012) on Crassosteria giags during 2007, Kandeel et al (2013), Abdel Razek et al (2014), but lower than that reported by Park et al (20012) on C. gigas collected in 2008. These authors calculated sex ratio very close to 1:1 (males to females) in their studies on different species of bivalves.…”

“…For family Mytilidae and very close families, the articles treated reproductive activity were considered, particularly those either carried out along the Egyptian coastal waters of the Red Sea, Mediterranean Sea and Suez Canal or those carried out in the very near regions along European, African and Asian coasts of the previous mentioned seas or those on the Atlantic and Indo-Pacific regions. Other works studied the relationships between the effects of environmental conditions and reproductive activities were also considered (Nayar, 1977;Seed and Brown, 1977;Abou Zied, 1991;Galinou-Mitsoudi and Sinis, 1994;Gab-Alla et al, 2007;Kandeel et al, 2013;Abdel Razek et al, 2014 andRadwan, 2014). ),…”

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

“…Fekunditas kerang tahu berada dalam jumlah lebih kecil dibandingkan dengan jumlah telur pada kerang sama di Pantai Panguil, Mindanao Filipina dengan fekunditas rata-rata sebanyak 3,15×10 6 ± 4,21×10 6 telur/betina dan berkisar 2,29 sampai 3,96×10 6 telur/betina (Sienes et al 2018). Demikian halnya dengan fekunditas kerang tahu di Pantai Nam Dinh sebesar 318.400 hingga 3.825.000 telur/individu, dengan rata-rata 1.181.151 telur/individu (Thanh, 2013) (Razek et al 2014;Delmott dan Edds, 2014). Awal kematangan gonad pada kerang dapat bervariasi pada spesies yang sama (Bahtiar et al 2021) yang merupakan fungsi dari kualitas lingkungan pada tempat berbeda (Galimany et al 2015).…”