Pub Date : 2020-10-27DOI: 10.1186/s10152-020-00543-8
Carola Becker, Jaimie T. A. Dick, E. Mánus Cunningham, Mathieu Lundy, Ewen Bell, Lawrence Eagling, Julia D. Sigwart
The Norway lobster, Nephrops norvegicus, is an important fisheries species in the North-East Atlantic area. In some circumstances, mature females of Nephrops norvegicus can resorb their ovary rather than completing spawning, but the implications of this phenomenon to reproductive biology and fisheries sustainability are not known. To understand after effects of ovary resorption, we studied long-term demographic data sets (1994–2017) collected from the western Irish Sea and the North Sea. Our considerations focused on potential correlations among the frequency of resorption, female insemination, and body size of resorbing females. Resorption was continuously rare in the western Irish Sea (less than 1%); whereas much higher rates with considerable year-to-year variation were observed in the North Sea (mean 9%). Resorption started in autumn after the spawning season (summer) had passed. The frequency stayed high throughout winter and declined again in spring. As sperm limitation can occur in male-biased fisheries, we expected a lack of insemination could be responsible for resorption, but affected females were indeed inseminated. Resorbing females were significantly larger than other sexually mature females in the North Sea, but the opposite trend was observed in the western Irish Sea. It is therefore possible that other, environmental factors or seasonal shifts, may trigger females to resorb their ovaries instead of spawning. Resorption may as well represent a natural phenomenon allowing flexibility in the periodicity of growth and reproduction. In this sense, observations of annual versus biennial reproductive cycles in different regions may be closely linked to the phenomenon of ovary resorption.
{"title":"Ovary resorption in the Norway lobster (Nephrops norvegicus) and its possible causes with special reference to sperm storage","authors":"Carola Becker, Jaimie T. A. Dick, E. Mánus Cunningham, Mathieu Lundy, Ewen Bell, Lawrence Eagling, Julia D. Sigwart","doi":"10.1186/s10152-020-00543-8","DOIUrl":"https://doi.org/10.1186/s10152-020-00543-8","url":null,"abstract":"The Norway lobster, Nephrops norvegicus, is an important fisheries species in the North-East Atlantic area. In some circumstances, mature females of Nephrops norvegicus can resorb their ovary rather than completing spawning, but the implications of this phenomenon to reproductive biology and fisheries sustainability are not known. To understand after effects of ovary resorption, we studied long-term demographic data sets (1994–2017) collected from the western Irish Sea and the North Sea. Our considerations focused on potential correlations among the frequency of resorption, female insemination, and body size of resorbing females. Resorption was continuously rare in the western Irish Sea (less than 1%); whereas much higher rates with considerable year-to-year variation were observed in the North Sea (mean 9%). Resorption started in autumn after the spawning season (summer) had passed. The frequency stayed high throughout winter and declined again in spring. As sperm limitation can occur in male-biased fisheries, we expected a lack of insemination could be responsible for resorption, but affected females were indeed inseminated. Resorbing females were significantly larger than other sexually mature females in the North Sea, but the opposite trend was observed in the western Irish Sea. It is therefore possible that other, environmental factors or seasonal shifts, may trigger females to resorb their ovaries instead of spawning. Resorption may as well represent a natural phenomenon allowing flexibility in the periodicity of growth and reproduction. In this sense, observations of annual versus biennial reproductive cycles in different regions may be closely linked to the phenomenon of ovary resorption.","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":"67 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138512977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carrier culture is the combination of suspension culture and adherent culture. Carriers could be used to improve the culture efficiency of large-scale culture of adherent benthic diatom. In order to identify a suitable carrier for mass suspension culture of the benthic diatoms Nitzschia sp. powders of seven macroalgae were used as carriers for diatom attachment including Ulva pertusa, degummed Laminaria japonica, Sargassum muticum, Chaetomorpha valida, Zostera marina, Sargassum fusiforme and Sargassum thunbergii. Diatoms could grow on the surface of the suspended carriers and could effectively utilize the nutrients released by the decomposition of these carriers. Among the seven carriers, Ulva pertusa powder was the most effective for Nitzschia culture when comprehensively considering the nutrition of the harvested diatoms and nutrient utilization of the algae carrier by diatoms. The seaweed powder was dried at 80 °C before used as carrier, this process should meet the sterilization requirements for microalgal culture and is easy to implement in the large-scale cultivation of diatoms. Diatoms cultured with carriers were used to feed juveniles Stichopus japonicus with a wet weight of 5.0 ± 2.0 g, as well as diatoms cultured using conventional methods without carriers, and no significant differences were observed between the two kinds of feed. Compared to sea cucumbers fed with commercial feed, the growth rate of S. japonicus fed with carrier-cultured diatoms was approximately 1.5 times greater, and the activities of non-specific immune enzymes were improved in the coelomic fluid including acidic phosphatase, alkaline phosphatase and superoxide dismutase. Feeding sea cucumber with fresh diatoms could effectively reduce the total nitrogen and total phosphorus in the culture water, improve the water quality, and promote the breeding of sea cucumbers, regardless of whether the carrier culture was adopted.
{"title":"Culture of benthic diatom Nitzschia sp. with macroalgae carriers and its application as feed of juveniles Stichopus japonicus","authors":"Aili Jiang, Heng Ji, Hengxu Liu, Huimin Zhu, Guofeng Ai, Xiaochen Guo","doi":"10.1186/s10152-020-00544-7","DOIUrl":"https://doi.org/10.1186/s10152-020-00544-7","url":null,"abstract":"Carrier culture is the combination of suspension culture and adherent culture. Carriers could be used to improve the culture efficiency of large-scale culture of adherent benthic diatom. In order to identify a suitable carrier for mass suspension culture of the benthic diatoms Nitzschia sp. powders of seven macroalgae were used as carriers for diatom attachment including Ulva pertusa, degummed Laminaria japonica, Sargassum muticum, Chaetomorpha valida, Zostera marina, Sargassum fusiforme and Sargassum thunbergii. Diatoms could grow on the surface of the suspended carriers and could effectively utilize the nutrients released by the decomposition of these carriers. Among the seven carriers, Ulva pertusa powder was the most effective for Nitzschia culture when comprehensively considering the nutrition of the harvested diatoms and nutrient utilization of the algae carrier by diatoms. The seaweed powder was dried at 80 °C before used as carrier, this process should meet the sterilization requirements for microalgal culture and is easy to implement in the large-scale cultivation of diatoms. Diatoms cultured with carriers were used to feed juveniles Stichopus japonicus with a wet weight of 5.0 ± 2.0 g, as well as diatoms cultured using conventional methods without carriers, and no significant differences were observed between the two kinds of feed. Compared to sea cucumbers fed with commercial feed, the growth rate of S. japonicus fed with carrier-cultured diatoms was approximately 1.5 times greater, and the activities of non-specific immune enzymes were improved in the coelomic fluid including acidic phosphatase, alkaline phosphatase and superoxide dismutase. Feeding sea cucumber with fresh diatoms could effectively reduce the total nitrogen and total phosphorus in the culture water, improve the water quality, and promote the breeding of sea cucumbers, regardless of whether the carrier culture was adopted.","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":"59 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138512954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-28DOI: 10.1186/s10152-020-00542-9
P. J. Vuorinen, M. Rokka, T. Ritvanen, R. Käkelä, Soili Nikonen, T. Pakarinen, M. Keinänen
{"title":"Changes in thiamine concentrations, fatty acid composition, and some other lipid-related biochemical indices in Baltic Sea Atlantic salmon (Salmo salar) during the spawning run and pre-spawning fasting","authors":"P. J. Vuorinen, M. Rokka, T. Ritvanen, R. Käkelä, Soili Nikonen, T. Pakarinen, M. Keinänen","doi":"10.1186/s10152-020-00542-9","DOIUrl":"https://doi.org/10.1186/s10152-020-00542-9","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00542-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49526510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-12DOI: 10.1186/s10152-020-00541-w
Nikolas J. Kaplanis, Jill L. Harris, J. Smith
{"title":"A cross-genus comparison of grazing pressure by two native marine herbivores on native, non-native naturalized, and non-native invasive Sargassum macroalgae","authors":"Nikolas J. Kaplanis, Jill L. Harris, J. Smith","doi":"10.1186/s10152-020-00541-w","DOIUrl":"https://doi.org/10.1186/s10152-020-00541-w","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00541-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43482699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-06DOI: 10.1186/s10152-020-00540-x
Paula Gundi, Chiara Cecchin, Lara-Leonie Fetzer, C. Haug, R. Melzer, J. Haug
{"title":"Giant planktic larvae of anomalan crustaceans and their unusual compound eyes","authors":"Paula Gundi, Chiara Cecchin, Lara-Leonie Fetzer, C. Haug, R. Melzer, J. Haug","doi":"10.1186/s10152-020-00540-x","DOIUrl":"https://doi.org/10.1186/s10152-020-00540-x","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00540-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42205797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.1186/s10152-020-00539-4
Morgana Brito-Lolaia, G. S. Santos, S. Neumann-Leitão, R. Schwamborn
{"title":"Micro- and mesozooplankton at the edges of coastal tropical reefs (Tamandaré, Brazil)","authors":"Morgana Brito-Lolaia, G. S. Santos, S. Neumann-Leitão, R. Schwamborn","doi":"10.1186/s10152-020-00539-4","DOIUrl":"https://doi.org/10.1186/s10152-020-00539-4","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00539-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65910916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-12DOI: 10.1186/s10152-020-00538-5
Violeta Martínez-Castillo, A. Rodríguez-Troncoso, H. Reyes‐Bonilla, C. A. Aguilar-Cruz, Carlos Rangel-Davalos
{"title":"Reproduction of the endangered endemic saffron coral to the Gulf of California Porites sverdrupi (Anthozoa: Scleractinia): implications for its long-term maintenance","authors":"Violeta Martínez-Castillo, A. Rodríguez-Troncoso, H. Reyes‐Bonilla, C. A. Aguilar-Cruz, Carlos Rangel-Davalos","doi":"10.1186/s10152-020-00538-5","DOIUrl":"https://doi.org/10.1186/s10152-020-00538-5","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00538-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41454645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-02DOI: 10.1186/s10152-020-00537-6
S. Borsetti, D. Munroe, D. Rudders, Jui‐Han Chang
{"title":"Timing of the reproductive cycle of waved whelk, Buccinum undatum, on the U.S. Mid-Atlantic Bight","authors":"S. Borsetti, D. Munroe, D. Rudders, Jui‐Han Chang","doi":"10.1186/s10152-020-00537-6","DOIUrl":"https://doi.org/10.1186/s10152-020-00537-6","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-00537-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42312224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-06DOI: 10.1186/s10152-020-0536-8
M. Darya, M. Sajjadi, M. Yousefzadi, I. Sourinejad, M. Zarei
{"title":"Antifouling and antibacterial activities of bioactive extracts from different organs of the sea cucumber Holothuria leucospilota","authors":"M. Darya, M. Sajjadi, M. Yousefzadi, I. Sourinejad, M. Zarei","doi":"10.1186/s10152-020-0536-8","DOIUrl":"https://doi.org/10.1186/s10152-020-0536-8","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-0536-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44147819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-24DOI: 10.1186/s10152-020-0535-9
Xinghuo Wang, Yueyong Shang, Hui Kong, Menghong Hu, Jinlong Yang, Y. Deng, Youji Wang
{"title":"Combined effects of ocean acidification and hypoxia on the early development of the thick shell mussel Mytilus coruscus","authors":"Xinghuo Wang, Yueyong Shang, Hui Kong, Menghong Hu, Jinlong Yang, Y. Deng, Youji Wang","doi":"10.1186/s10152-020-0535-9","DOIUrl":"https://doi.org/10.1186/s10152-020-0535-9","url":null,"abstract":"","PeriodicalId":55063,"journal":{"name":"Helgoland Marine Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s10152-020-0535-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45075624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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