Gonadal cycle and spawning of date mussel Lithophaga lithophaga (L.) (Bivalvia: Mytilidae) in Egyptian water

Khafage, Amal R.; Razek, Fatma A. Abdel; Taha, Somaya M.; Omar, Hamdy A.; Attallah, Mahmoud A.; El-Deeb, Rabab S.

doi:10.1016/j.ejar.2019.04.001

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…However, in subsequent gametogenesis, the gonad size and index increase gradually (Walker et al 2007). Results of the current study showed that bivalves require satisfactory environmental conditions (Hamli et al 2019) and availability of foods (Dridi et al 2014;Chilmawati 2016;Breton et al 2018;Khafage et al 2019) for gametogenesis and spawning to occur. The temperature was stated to influence the spawning activity of bivalves (Aji 2011;Sreedevi et al 2014).…”

Section: Gonadal Indexmentioning

confidence: 51%

Sex ratio, gonadal and condition indexes of the Asiatic hard clam, Meretrix meretrix in Marudu Bay, Malaysia

2021

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Abstract. Duisan L, Salim G, Ransangan J. 2021. Sex ratio, Gonadal and Condition indexes of the Asiatic Hard Clam, Meretrix meretrix in Marudu Bay, Malaysia. Biodiversitas 22: 4895-4904. Asiatic hard clam, Meretrix meretrix is one of the important shellfishery resources in Marudu Bay, Sabah, Malaysia. It is among the most popular clam species being widely traded in the local wet markets around Sabah, Malaysia. Unfortunately, the shellfishery management for this species has not been well established. In addition to overexploitation, habitat destruction is also one of the significant threats to this species due to the extensive land use of the coastal areas in Sabah. Hence, conservation and breeding efforts for this species are greatly required. Therefore, the current study was conducted to examine the sexual maturity of the clam with respect to shell length classes for artificial seed production purposes. For this study, a total of 86 clam specimens were randomly collected from mudflats in Marudu Bay. The specimens were utilized for gonad histological and condition analyses. The clams were grouped into three shell length classes; (3.00-4.99) cm, (5.00-6.99) cm, and (7.00-8.99) cm prior to the analyses. Results showed the natural stock of the Asiatic hard clams in Marudu Bay was dominated by females (1.39:1) over males with no hermaphroditism observed. The gonadal index was recorded higher among clams with shell lengths between 5.00 and 6.99 cm. The condition index analysis also recorded high (>4.0) for clams in all the shell length classes. The findings of this study suggest that the clams with shell lengths between 5.00 cm and 7.00 cm are already fully matured and can be utilized as a broodstock candidate for an artificial breeding program in the hatchery.

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Section: Gonadal Indexmentioning

confidence: 51%

Sex ratio, gonadal and condition indexes of the Asiatic hard clam, Meretrix meretrix in Marudu Bay, Malaysia

2021

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“…In general, the ratio of the sexes for dioecious bivalves is approximately 1:1 with the number of females often being slightly higher than the number of males [ 24 , 26 ]. In some bivalves like Lithophaga lithophaga the ratio of males often being higher than the ratio of females (3.5:1) [ 27 ]. Previous studies on bivalve reproduction have found that the sex ratio was 1:1, including for Gafrarium pectinatum [ 28 ], Gafrarium tumidum [ 22 ], Donax trunculus [ 29 ], Anadara granosa [ 30 ], Blood cockles Anadara inaequivalvis [ 31 ], Scrobicularia plana [ 32 ], and Noah’s ark shell Arca noae [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

“…In addition, it is decreased to 3.2 cm as reported by Chatananthawej [ 42 ] in the same site and in Suratthani province it is 3.06 cm. Jindalikit [ 27 ] stated that the size at first mature of P. undulata in Mahachai Bay, Samut Sakhon province was 3.16 and 3.19 cm in both males and females, respectively while its size at first maturity found in Southern Negros Occidental, Central Philippines was 4.23 cm for males and 4.48 cm for females [ 43 ] and it was 4.26 cm for males and 4.48 cm for females [ 24 ]. The average size at sexual maturity in P. undulata was greater than 4.0 cm in Thailand [ 44 ].…”

Section: Discussionmentioning

confidence: 99%

The gametogenic cycle and spawning of the short-necked clam, Paphia undulata Born, 1778 (Bivalvia: Veneridae) from Timsah Lake, Suez Canal, Egypt

Mahmoud,

Yassien

2023

BMC Zool

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Background Paphia undulata, The Short-Necked Clam, is an edible marine bivalve that is consumed internationally and locally in Egypt. Overfishing and pollution have caused population declines in Egyptian fisheries during the last decade. Accurate reproductive biology knowledge is critical for designing long-term exploitation strategy for this resource. P. undulata spawning and gametogenic cycle research were carried out from January to December 2020 along Timsah Lake, Suez Canal, Egypt. Results These clams are functionally dioecious with a very low incidence of hermaphroditism. The sex ratio of the clam population was 1.0:1.07:0.04 for male, female and hermaphrodite respectively. The shell lengths of the collected clams were 4.64 ± 0.83 cm in males, 4.55 ± 0.9 cm in females and 4.19 ± 0.3 cm in hermaphrodite clams. The sizes at the onset of sexual maturity in both males and females were 2.1 cm and 2.5 cm respectively. Conclusions Reproductive studies revealed that this species has a prolonged spawning season that is not restricted to a specific period.

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“…This means that the population is still in equilibrium, wherein inbreeding and competition for mates do not occur [22,23]. In general, the ratio of the sexes for dioecious bivalves is approximately 1:1 [24], with the number of females often being slightly higher than the number of males [22,25]. Previous studies on bivalve reproduction have found that the sex ratio was 1:1, including for Gafrarium pectinatum [25], Gafrarium tumidum [19], Donax trunculus [27], Anadara granosa [28], Blood cockles Anadara inaequivalvis [29], Scrobicularia plana [30], and Noah's ark shell Arca noae [31].…”

Section: Discussionmentioning

confidence: 99%

The gametogenic cycle and spawning of the Short-Necked Clam, Paphia undulata Born, 1778 from Timsah Lake, Suez Canal, Egypt

Mahmoud

Yassien

2022

Preprint

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Background The Short-Necked Clam Paphia undulata is a marine edible bivalve consumed all over the world and locally in Egypt. In the past decade, its population declined across the Egyptian fisheries due to overexploitation and pollution. The gametogenic cycle and spawning studies of P. undulata were carried out during the period from January 2020 to December 2020 along Timsah Lake, Suez Canal, Egypt. Results Shell lengths of the collected clams ranged from 2.31 cm to 6.22 cm in males, 2.05 cm to 5.97 cm in females and 3.70 cm to 4.36 cm in hermaphrodite clams. These clams are functionally dioecious wherein male and female sexes are separate, with very low incidences of hermaphroditism. The sex ratio (male: female: hermaphrodite) of the clam population was 1.0: 1.07: 0.04. The onset of sexual maturity of both males and females was 2.3 cm and 2.7 cm respectively. Conclusions Reproductive studies revealed that this species has a prolonged spawning season not restricted during a certain period.

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Gonadal cycle and spawning of date mussel Lithophaga lithophaga (L.) (Bivalvia: Mytilidae) in Egyptian water

Cited by 5 publications

References 11 publications

Sex ratio, gonadal and condition indexes of the Asiatic hard clam, Meretrix meretrix in Marudu Bay, Malaysia

Sex ratio, gonadal and condition indexes of the Asiatic hard clam, Meretrix meretrix in Marudu Bay, Malaysia

The gametogenic cycle and spawning of the short-necked clam, Paphia undulata Born, 1778 (Bivalvia: Veneridae) from Timsah Lake, Suez Canal, Egypt

The gametogenic cycle and spawning of the Short-Necked Clam, Paphia undulata Born, 1778 from Timsah Lake, Suez Canal, Egypt

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