The reproductive pattern of the white barrel jellyfish Rhizostoma pulmo (Cnidaria, Scyphozoa) in the gulf of Taranto (Ionian Sea) DOI Open Access
Marta Mammone, Lorena Basso, Lucia Rizzo

et al.

Mediterranean Marine Science, Journal Year: 2024, Volume and Issue: 25(2), P. 393 - 403

Published: July 8, 2024

Understanding the mechanisms that lead to proliferation of large jellyfish populations over time is crucial prevent andmitigate any possible negative impacts on human activities and ecosystem functioning. Rhizostoma pulmo (Macri, 1778) an outbreak forming species Mediterranean Sea has been observed in anthropized areas including Gulf Taranto. To describe seasonal changes reproductive patterns R. from May December 2016, we measured diameter, number diameter oocytes using histological biochemical analyses (lipids, carbohydrates, proteins, organic matter), as well gonadal somatic index (GSI). Jellyfish size did not fluctuate considerably during collection period, with specimens measuring between 19.5 38.2 cm diameter. Our findings revealed a strong activity summer spawning event September October. Male female gonad morphology was similar other previously reported Rhizostomeae. Oocytes were categorized into three developmental classes, recognizable by their shape: <15 μm for pre-vitellogenesis, 15-30 vitellogenesis, >30 mature oocytes. The peaked August, smaller eggs recorded October larger near end summer. GSI fluctuated greatly sampling dates, peaking August. Lipid levels varied significantly throughout greatest value (277.26±98 μg lipid mg AFDW-1) lowest (70.36±41.5 AFDW-1). Carbohydrates, matter (62 ± 6 %) remained stable period. sexual reproduction report here can be used tool identifying periods better understanding process control population dynamics.

Language: Английский

The Effects of Salinity on the Growth, Survival, and Feeding of Sanderia malayensis (Cnidaria: Scyphozoa) Ephyrae DOI Creative Commons
Shin Ks,

Keun-Hyung Choi

Diversity, Journal Year: 2025, Volume and Issue: 17(4), P. 239 - 239

Published: March 27, 2025

Sanderia malayensis is a species from the phylum Cnidaria, class Scyphozoa, and order Semaeostomeae, found in tropical waters, including Red Sea, Indian Ocean, Malaysian waters. Its distribution extends to waters of Australia Japan. This study aimed evaluate effects salinity on growth survival ephyrae determine its optimal range. The experimental design included two temperature conditions (20 °C 24 °C) three levels (21 PSU, 27 PSU). results indicated that feeding abilities were significantly higher PSU environments compared 21 with best observed at both temperatures. Survival rates °C: 90%, 79%) 87%, 86%) 70%, 55%). Despite lower demonstrated wide environmental adaptability. These findings suggest are highly adaptable varying conditions, indicating potential for expand into South Korean other East Asian marine ecosystems, China Japan, which impacted by climate change.

Language: Английский

Citations

0
The reproductive pattern of the white barrel jellyfish Rhizostoma pulmo (Cnidaria, Scyphozoa) in the gulf of Taranto (Ionian Sea) DOI Open Access
Marta Mammone, Lorena Basso, Lucia Rizzo

et al.

Mediterranean Marine Science, Journal Year: 2024, Volume and Issue: 25(2), P. 393 - 403

Published: July 8, 2024

Understanding the mechanisms that lead to proliferation of large jellyfish populations over time is crucial prevent andmitigate any possible negative impacts on human activities and ecosystem functioning. Rhizostoma pulmo (Macri, 1778) an outbreak forming species Mediterranean Sea has been observed in anthropized areas including Gulf Taranto. To describe seasonal changes reproductive patterns R. from May December 2016, we measured diameter, number diameter oocytes using histological biochemical analyses (lipids, carbohydrates, proteins, organic matter), as well gonadal somatic index (GSI). Jellyfish size did not fluctuate considerably during collection period, with specimens measuring between 19.5 38.2 cm diameter. Our findings revealed a strong activity summer spawning event September October. Male female gonad morphology was similar other previously reported Rhizostomeae. Oocytes were categorized into three developmental classes, recognizable by their shape: <15 μm for pre-vitellogenesis, 15-30 vitellogenesis, >30 mature oocytes. The peaked August, smaller eggs recorded October larger near end summer. GSI fluctuated greatly sampling dates, peaking August. Lipid levels varied significantly throughout greatest value (277.26±98 μg lipid mg AFDW-1) lowest (70.36±41.5 AFDW-1). Carbohydrates, matter (62 ± 6 %) remained stable period. sexual reproduction report here can be used tool identifying periods better understanding process control population dynamics.

Language: Английский

Citations

0