Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia
The reproductive biology of Mactra stultorum from the Gulf of Gabes was investigated monthly during a one-year period (2017). This study is the first study examining its reproductive biology during one-year in the south of Tunisia. The overall samples presented a balanced sex ratio, with males domin...
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| Language: | English |
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Sciendo
2023-10-01
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| Series: | Oceanological and Hydrobiological Studies |
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| Online Access: | https://doi.org/10.26881/oahs-2023.3.01 |
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| author | Derbali Abdelkarim |
| author_facet | Derbali Abdelkarim |
| author_sort | Derbali Abdelkarim |
| collection | DOAJ |
| description | The reproductive biology of Mactra stultorum from the Gulf of Gabes was investigated monthly during a one-year period (2017). This study is the first study examining its reproductive biology during one-year in the south of Tunisia. The overall samples presented a balanced sex ratio, with males dominating among smaller individuals (< 22 mm) and females predominating in larger size classes (> 34 mm). The obtained total sex ratio (F:M) was equal to 1.03:1. The size at first maturity (SL50%) was 20.43 and 22.10 mm for males and females, respectively. The seasonal variations assessed through macro- and microscopic characteristics in the gonads of both sexes indicated a clearly defined annual reproductive cycle with a principal spawning peak during summer and a resting period during December and January. The reproduction of M. stultorum was strongly influenced by fluctuations in the seawater temperature, as reflected through the temporal variation in the gonadal cycle, condition index (CI) and tissue weight rate (TiWR). If managed properly, M. stultorum is expected to meet the domestic market demand through artisanal fishery. The adoption and implementation of rules, such as limiting the size of clams, is required to protect this new exploitable fishery resource. |
| format | Article |
| id | doaj-art-dde3235281bc40cf918e51c6c6f5998b |
| institution | Kabale University |
| issn | 1897-3191 |
| language | English |
| publishDate | 2023-10-01 |
| publisher | Sciendo |
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| series | Oceanological and Hydrobiological Studies |
| spelling | doaj-art-dde3235281bc40cf918e51c6c6f5998b2025-01-20T11:10:23ZengSciendoOceanological and Hydrobiological Studies1897-31912023-10-0152326427210.26881/oahs-2023.3.01Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, TunisiaDerbali Abdelkarim0Institut National des Sciences et Technologies de la Mer (INSTM), Sfax, TunisiaThe reproductive biology of Mactra stultorum from the Gulf of Gabes was investigated monthly during a one-year period (2017). This study is the first study examining its reproductive biology during one-year in the south of Tunisia. The overall samples presented a balanced sex ratio, with males dominating among smaller individuals (< 22 mm) and females predominating in larger size classes (> 34 mm). The obtained total sex ratio (F:M) was equal to 1.03:1. The size at first maturity (SL50%) was 20.43 and 22.10 mm for males and females, respectively. The seasonal variations assessed through macro- and microscopic characteristics in the gonads of both sexes indicated a clearly defined annual reproductive cycle with a principal spawning peak during summer and a resting period during December and January. The reproduction of M. stultorum was strongly influenced by fluctuations in the seawater temperature, as reflected through the temporal variation in the gonadal cycle, condition index (CI) and tissue weight rate (TiWR). If managed properly, M. stultorum is expected to meet the domestic market demand through artisanal fishery. The adoption and implementation of rules, such as limiting the size of clams, is required to protect this new exploitable fishery resource.https://doi.org/10.26881/oahs-2023.3.01mactra stultorumreproductive cyclesex ratiosize at maturitycondition indexgulf of gabestunisia |
| spellingShingle | Derbali Abdelkarim Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia Oceanological and Hydrobiological Studies mactra stultorum reproductive cycle sex ratio size at maturity condition index gulf of gabes tunisia |
| title | Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia |
| title_full | Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia |
| title_fullStr | Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia |
| title_full_unstemmed | Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia |
| title_short | Seasonal changes in the reproductive cycle and condition index of the surf clam Mactra stultorum (Mollusca: Bivalvia) in the Gulf of Gabes, Tunisia |
| title_sort | seasonal changes in the reproductive cycle and condition index of the surf clam mactra stultorum mollusca bivalvia in the gulf of gabes tunisia |
| topic | mactra stultorum reproductive cycle sex ratio size at maturity condition index gulf of gabes tunisia |
| url | https://doi.org/10.26881/oahs-2023.3.01 |
| work_keys_str_mv | AT derbaliabdelkarim seasonalchangesinthereproductivecycleandconditionindexofthesurfclammactrastultorummolluscabivalviainthegulfofgabestunisia |