Daril de la Nuez Hernández, Lourdes Pastor Gutiérrez, A. Angulo, Yuliet Piloto Cubero, R. C. Wong
Fish populations of the Syngnathidae family, including the charismatic seahorse, have significantly declined worldwide during the last decades. Up to now, these populations have been poorly researched in their habitat in Cuba. The objective of this study was to determinate site fidelity and home range of the longsnout seahorse (Hippocampus reidi Ginsburg, 1933), which has been poorly studied and has been classified as a Data Deficient (DD) species by the IUCN. Sampling was conducted between April 2009 and August 2010 in two stations located at the dock of Varadero, an artificial channel located northwest of Cuba. Visual census were conducted on 17 transects (20 x 1 m) at each station, and a total of 68 seahorses were identified and tagged with fluorescent elastomers. H. reidi showed site fidelity, with 48.5% of the marked individuals being recaptured close to or on the same transect where they were located the first time. The home range was 70.6 ± 60.1 m (mean ± SD), and no significant differences were found in this variable between both stations or between males and females. These results increase our current knowledge on this seahorse species and show the vulnerability of these populations to potential damages of their restricted habitat.
在过去的几十年里，包括极具魅力的海马在内的Syngnathidae家族的鱼类数量在世界范围内显著下降。到目前为止，对这些种群在古巴的栖息地的研究很少。本研究的目的是确定长鼻海马的地点保真度和栖息地范围(Hippocampus reidi Ginsburg, 1933)，对长鼻海马的研究很少，被世界自然保护联盟(IUCN)归类为数据不足(DD)物种。2009年4月至2010年8月期间，在位于古巴西北部一条人工水道巴拉德罗码头的两个站点进行了抽样。在每个站点对17个样带(20 x 1 m)进行了目测普查，共鉴定了68只海马，并用荧光弹性体进行了标记。reidi具有较高的站点保真度，48.5%的被标记个体被再次捕获时接近或位于它们首次定位的同一样带上。家距为70.6±60.1 m (mean±SD)，两站间、男女间无显著差异。这些结果增加了我们目前对这种海马物种的了解，并显示了这些种群对其有限栖息地的潜在破坏的脆弱性。
{"title":"Fidelidad al sitio y rango de hogar del caballito de mar narizón Hippocampus reidi (Teleostei: Syngnathidae) en la dársena de Varadero, noroeste de Cuba","authors":"Daril de la Nuez Hernández, Lourdes Pastor Gutiérrez, A. Angulo, Yuliet Piloto Cubero, R. C. Wong","doi":"10.15359/REVMAR.8-1.7","DOIUrl":"https://doi.org/10.15359/REVMAR.8-1.7","url":null,"abstract":"Fish populations of the Syngnathidae family, including the charismatic seahorse, have significantly declined worldwide during the last decades. Up to now, these populations have been poorly researched in their habitat in Cuba. The objective of this study was to determinate site fidelity and home range of the longsnout seahorse (Hippocampus reidi Ginsburg, 1933), which has been poorly studied and has been classified as a Data Deficient (DD) species by the IUCN. Sampling was conducted between April 2009 and August 2010 in two stations located at the dock of Varadero, an artificial channel located northwest of Cuba. Visual census were conducted on 17 transects (20 x 1 m) at each station, and a total of 68 seahorses were identified and tagged with fluorescent elastomers. H. reidi showed site fidelity, with 48.5% of the marked individuals being recaptured close to or on the same transect where they were located the first time. The home range was 70.6 ± 60.1 m (mean ± SD), and no significant differences were found in this variable between both stations or between males and females. These results increase our current knowledge on this seahorse species and show the vulnerability of these populations to potential damages of their restricted habitat.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"8 1","pages":"95-112"},"PeriodicalIF":0.2,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.8-1.7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
José A. Villarroel-Moreno, Vanessa Acosta-Balbás, Miguel A. Guevara-Acosta
The analysis of biochemical components in marine species for human consumption is of great importance because it allows knowing the nutritional and energy properties of the organism. The biochemical profile of Arca zebra tissues was evaluated in this research in relation to environmental factors, with the purpose of using this information as an indicator of the reproductive dynamics and fattening periods of this important fishery resource. A total of 20 organisms were analyzed per month between July 2010 and July 2011. Total length (TL) was determined in each organism, and tissues were separated using spectrophotometry, leaving them at a constant weight for biochemical analyzes. TL differences were established monthly, with an annual average of 69.61 mm, staying above commercial size. Differences were detected for carbohydrates and proteins between months, with maximum values in March and July 2011, being the muscle the part with the highest content of both energy substrates, related to high levels of chlorophyll a. An inverse relationship was observed between carbohydrates and proteins in the three tissues in regards to the gonadal mass, suggesting a possible transfer during the reproductive process of A. zebra. The greatest lipid content without monthly variation was recorded in gonads due to the species reproductive synchrony. A. zebra shows its best nutritional condition during the periods from September to December and March to June. Commercialization and consumption is recommended during those months.
{"title":"Movilización y utilización de los sustratos energéticos de Arca zebra (Bivalvia: Arcidae) en relación con el ambiente","authors":"José A. Villarroel-Moreno, Vanessa Acosta-Balbás, Miguel A. Guevara-Acosta","doi":"10.15359/revmar.8-1.5","DOIUrl":"https://doi.org/10.15359/revmar.8-1.5","url":null,"abstract":"The analysis of biochemical components in marine species for human consumption is of great importance because it allows knowing the nutritional and energy properties of the organism. The biochemical profile of Arca zebra tissues was evaluated in this research in relation to environmental factors, with the purpose of using this information as an indicator of the reproductive dynamics and fattening periods of this important fishery resource. A total of 20 organisms were analyzed per month between July 2010 and July 2011. Total length (TL) was determined in each organism, and tissues were separated using spectrophotometry, leaving them at a constant weight for biochemical analyzes. TL differences were established monthly, with an annual average of 69.61 mm, staying above commercial size. Differences were detected for carbohydrates and proteins between months, with maximum values in March and July 2011, being the muscle the part with the highest content of both energy substrates, related to high levels of chlorophyll a. An inverse relationship was observed between carbohydrates and proteins in the three tissues in regards to the gonadal mass, suggesting a possible transfer during the reproductive process of A. zebra. The greatest lipid content without monthly variation was recorded in gonads due to the species reproductive synchrony. A. zebra shows its best nutritional condition during the periods from September to December and March to June. Commercialization and consumption is recommended during those months.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"8 1","pages":"63-78"},"PeriodicalIF":0.2,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/revmar.8-1.5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luis Hernández Noguera, R. S. Rojas, Cristián Ramírez
The white shrimp (Litopenaeus sp.) is among the most socioeconomically important resources in the Gulf of Nicoya. However, in the last years, the carabali shrimp (Trachypenaeus byrdi) has become a species of high local commercial value. Therefore, samples of the carabali shrimp (T. byrdi) collected in the inner section of the Gulf for 15 months between 2008 and 2009 were analyzed in the present study in order to ascertain the biology and population dynamics of this resource. It was confirmed that T. byrdi is found mainly on muddy bottoms located in the inner part of the Gulf, close to the coastal area at depths no greater than 15 m. Population parameters show that female average size at maturity is 87 mm TL (Total Lenght). Two main reproduction periods were identified: March-April and July-September. Estimated growth parameters were Loo= 112.6 mm, K= 1.29 yr-1, to= -0.084 and Woo= 18.68 g for females and Loo= 88.2 mm, K= 1.26 yr-1 and to= -0.094 for males.
白虾(Litopenaeus sp.)是尼科亚湾最重要的社会经济资源之一。然而，在过去的几年里，卡拉巴虾(Trachypenaeus byrdi)已经成为一个具有很高商业价值的物种。因此，本研究对2008年至2009年在墨西哥湾内段采集的15个月的虾蛄(T. byrdi)样本进行了分析，以确定该资源的生物学和种群动态。经证实，T. byrdi主要分布在墨西哥湾内部靠近海岸区域的泥质底部，深度不大于15 m。种群参数表明，雌性成熟时的平均体型为87 mm TL(总长度)。确定了两个主要的繁殖期:3 - 4月和7 - 9月。雌性的生长参数为Loo= 112.6 mm, K= 1.29 year -1, to= -0.084, Woo= 18.68 g;雄性的生长参数为Loo= 88.2 mm, K= 1.26 year -1, to= -0.094。
{"title":"Reproducción del camarón carabalí Trachypenaeus byrdi (Burkenroad, 1934) en la parte interna del Golfo de Nicoya, Costa Rica","authors":"Luis Hernández Noguera, R. S. Rojas, Cristián Ramírez","doi":"10.15359/REVMAR.8-1.6","DOIUrl":"https://doi.org/10.15359/REVMAR.8-1.6","url":null,"abstract":"The white shrimp (Litopenaeus sp.) is among the most socioeconomically important resources in the Gulf of Nicoya. However, in the last years, the carabali shrimp (Trachypenaeus byrdi) has become a species of high local commercial value. Therefore, samples of the carabali shrimp (T. byrdi) collected in the inner section of the Gulf for 15 months between 2008 and 2009 were analyzed in the present study in order to ascertain the biology and population dynamics of this resource. It was confirmed that T. byrdi is found mainly on muddy bottoms located in the inner part of the Gulf, close to the coastal area at depths no greater than 15 m. Population parameters show that female average size at maturity is 87 mm TL (Total Lenght). Two main reproduction periods were identified: March-April and July-September. Estimated growth parameters were Loo= 112.6 mm, K= 1.29 yr-1, to= -0.084 and Woo= 18.68 g for females and Loo= 88.2 mm, K= 1.26 yr-1 and to= -0.094 for males.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"48 1","pages":"79-93"},"PeriodicalIF":0.2,"publicationDate":"2016-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.8-1.6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arturo Ayala-Bocos, Héctor Reyes-Bonilla, L. E. Calderón-Aguilera, María-Dinorah Herrero-Pérezrul, Pedro C. González-Espinosa
The Gulf of California is important because of its high biodiversity and because it is a key area for artisanal fisheries in Mexico. There are current concerns regarding threats to the Gulf, such as global warming, that have caused major changes in marine communities. Consequently, the aim of this study was to estimate the possible impact of increasing ocean temperature on key species. Potential effects of such increase on reef species are thus estimated in this paper. In order to prepare this estimate, sea surface temperature (SST) was obtained from the NOAA database, and a temperature change trend model was constructed. Biological data was obtained from visual censuses of six regions within the Gulf between 2005 and 2007. A stepwise linear model was used to forecast potential changes in species abundance and distribution. It is estimated that by 2050 average temperature will increase 0.63°C, causing abundance of species of economic value to significantly decrease south of 25° N. Finally, the response of the 20 most abundant fish species in the Gulf was modeled to estimate changes at community structure level. The simulation shows an imbalance in the function and structure of assemblages. Clearly, increasing sea temperature will bring an imbalance in the composition and the ecological function of the reef systems gradually changing the relative abundances of species. Therefore, the implementation of effective monitoring programs of communities would be an essential tool to detect future effects of global warming.
{"title":"Proyección de cambios en la temperatura superficial del mar del Golfo de California y efectos sobre la abundancia y distribución de especies arrecifales","authors":"Arturo Ayala-Bocos, Héctor Reyes-Bonilla, L. E. Calderón-Aguilera, María-Dinorah Herrero-Pérezrul, Pedro C. González-Espinosa","doi":"10.15359/REVMAR.8-1.2","DOIUrl":"https://doi.org/10.15359/REVMAR.8-1.2","url":null,"abstract":"The Gulf of California is important because of its high biodiversity and because it is a key area for artisanal fisheries in Mexico. There are current concerns regarding threats to the Gulf, such as global warming, that have caused major changes in marine communities. Consequently, the aim of this study was to estimate the possible impact of increasing ocean temperature on key species. Potential effects of such increase on reef species are thus estimated in this paper. In order to prepare this estimate, sea surface temperature (SST) was obtained from the NOAA database, and a temperature change trend model was constructed. Biological data was obtained from visual censuses of six regions within the Gulf between 2005 and 2007. A stepwise linear model was used to forecast potential changes in species abundance and distribution. It is estimated that by 2050 average temperature will increase 0.63°C, causing abundance of species of economic value to significantly decrease south of 25° N. Finally, the response of the 20 most abundant fish species in the Gulf was modeled to estimate changes at community structure level. The simulation shows an imbalance in the function and structure of assemblages. Clearly, increasing sea temperature will bring an imbalance in the composition and the ecological function of the reef systems gradually changing the relative abundances of species. Therefore, the implementation of effective monitoring programs of communities would be an essential tool to detect future effects of global warming.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"8 1","pages":"29-40"},"PeriodicalIF":0.2,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.8-1.2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66946011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ana G. Maldonado, Roberta Crescini, W. Villalba, Yuruaní Fuentes
Chicoreus brevifrons is characterized by being carnivorous, necrophagous, and relatively abundant in Venezuelan coasts, where it has an economic and ecological importance since it preys on oysters and other mollusks in marine environments and culture systems. This study aims at analyzing some reproductive aspects of the species in La Restinga lagoon, Margarita Island, Venezuela, at four stations from inside to outside of this lagoon. Samples were taken monthly and were used to determine sex ratio; in addition, some eggs were also taken from the site, for description and observation of initial growth of the species. C. brevifrons is characterized for being dioecious, clearly distinguishable for the presence of a penis in males and a vagina and albumin capsule in females. In general, sex ratio was 1:1, although females were more abundant than males during some months. Eggs from C. brevifrons are cluster-like, with 65 to 165 small white capsules. While the organisms develop inside the capsules, they are brown upon spawning, which takes place 45-50 days after they are laid. Initial sizes were between 1.60 mm and 2.56 mm of TL. Further biological and populations studies of this species are recommended in order to know more about its ethology, commercial importance and how they affect mollusk cultures.
{"title":"Aspectos reproductivos de Chicoreus brevifrons (Lamarck, 1822) (Neogastropoda: Muricidae) de la laguna de La Restinga, isla de Margarita, Venezuela","authors":"Ana G. Maldonado, Roberta Crescini, W. Villalba, Yuruaní Fuentes","doi":"10.15359/REVMAR.8-1.3","DOIUrl":"https://doi.org/10.15359/REVMAR.8-1.3","url":null,"abstract":"Chicoreus brevifrons is characterized by being carnivorous, necrophagous, and relatively abundant in Venezuelan coasts, where it has an economic and ecological importance since it preys on oysters and other mollusks in marine environments and culture systems. This study aims at analyzing some reproductive aspects of the species in La Restinga lagoon, Margarita Island, Venezuela, at four stations from inside to outside of this lagoon. Samples were taken monthly and were used to determine sex ratio; in addition, some eggs were also taken from the site, for description and observation of initial growth of the species. C. brevifrons is characterized for being dioecious, clearly distinguishable for the presence of a penis in males and a vagina and albumin capsule in females. In general, sex ratio was 1:1, although females were more abundant than males during some months. Eggs from C. brevifrons are cluster-like, with 65 to 165 small white capsules. While the organisms develop inside the capsules, they are brown upon spawning, which takes place 45-50 days after they are laid. Initial sizes were between 1.60 mm and 2.56 mm of TL. Further biological and populations studies of this species are recommended in order to know more about its ethology, commercial importance and how they affect mollusk cultures.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"8 1","pages":"41-50"},"PeriodicalIF":0.2,"publicationDate":"2015-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66946137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
David Herra-Miranda, Juan Diego Pacheco-Polanco, Lenin Oviedo, Miguel Iñíguez
Golfo Dulce harbors an important resident population of inshore bottlenose dolphins (T. truncatus) and migrating humpback whales (M. novaeangliae, Northern and Southern Pacific populations). The present study offers a detailed spatial analysis of the utilization distribution of bottlenose dolphins (2005-2014: n= 407) and humpback whales (2010-2014: n= 167), assessing the potential impacts due to coastal development by a marina project overlapping their critical habitats. Records yielding spatial and behavior information were analyzed through: 1) the average nearest neighbor index and 2) kernel density estimates, using two contours to illustrate the utilization distribution, a 50% contour for core critical areas and 95% contour for the potential home range. Bottlenose dolphins’ nonrandom aggregations (KDE-adaptive: Density 21.36 records/km2; H=0.25; H-REF= 0.49) are associated with all the major river drainages at the inner basin and sill area of Golfo Dulce, which represents key critical foraging habitats. Humpback whales’ nonrandom aggregations, including mother and calf pairs (KDE-adaptive: Density 1.33 records/km2; H=0.25; H-REF= 0.49) use the west coast of the sill area as calving and nursing critical habitat, whereas whales engaged in singing aggregate at the center of the Sill. Results suggest that the development of a luxury marina project has the potential of negatively affecting the critical habitats of both local species by becoming an important source of anthropogenic impacts due to increased maritime traffic and the associated noise pollution.
{"title":"Análisis espacial de los hábitats críticos del delfín nariz de botella (Tursiops truncatus) y la ballena jorobada (Megaptera novaeangliae) en el Golfo Dulce, Costa Rica: Consideraciones acerca de un proyecto de construcción de marina","authors":"David Herra-Miranda, Juan Diego Pacheco-Polanco, Lenin Oviedo, Miguel Iñíguez","doi":"10.15359/REVMAR.8-1.1","DOIUrl":"https://doi.org/10.15359/REVMAR.8-1.1","url":null,"abstract":"Golfo Dulce harbors an important resident population of inshore bottlenose dolphins (T. truncatus) and migrating humpback whales (M. novaeangliae, Northern and Southern Pacific populations). The present study offers a detailed spatial analysis of the utilization distribution of bottlenose dolphins (2005-2014: n= 407) and humpback whales (2010-2014: n= 167), assessing the potential impacts due to coastal development by a marina project overlapping their critical habitats. Records yielding spatial and behavior information were analyzed through: 1) the average nearest neighbor index and 2) kernel density estimates, using two contours to illustrate the utilization distribution, a 50% contour for core critical areas and 95% contour for the potential home range. Bottlenose dolphins’ nonrandom aggregations (KDE-adaptive: Density 21.36 records/km2; H=0.25; H-REF= 0.49) are associated with all the major river drainages at the inner basin and sill area of Golfo Dulce, which represents key critical foraging habitats. Humpback whales’ nonrandom aggregations, including mother and calf pairs (KDE-adaptive: Density 1.33 records/km2; H=0.25; H-REF= 0.49) use the west coast of the sill area as calving and nursing critical habitat, whereas whales engaged in singing aggregate at the center of the Sill. Results suggest that the development of a luxury marina project has the potential of negatively affecting the critical habitats of both local species by becoming an important source of anthropogenic impacts due to increased maritime traffic and the associated noise pollution.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"8 1","pages":"9-27"},"PeriodicalIF":0.2,"publicationDate":"2015-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.8-1.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gladys Vásquez, Roberta Crescini, W. Villalba, J. Mogollón, L. Tróccoli
Pearl oysters are abundant bivalves in the northeastern coast of South America that form dense shoals in the Caribbean Sea, where they are exploited for marketing, making them a valuable resource in northeastern Venezuela. In order to provide information on Pinctada imbricata in the La Restinga Lagoon, its growth, size structure, condition index and natural mortality were estimated from April 2012 to January 2013. A total of 40 random samples of pearl oysters were collected on a monthly basis by freediving in a linear transect of approximately 200 m. The total length and total weight ratio indicated a negative allometric growth. A multimodal distribution was shown in almost all sampling months, with sizes ranging between 21.56 and 54.61 mm of total length. The modal peak observed in most of the months was between 24 and 28 mm, indicating a continuous recruitment throughout the year. The maximum peak of the monthly condition index was in May 2012, while the minimum was in November 2012. Growth parameters were L∞ = 68.5 mm, K = 1.18/year and t0 = 0.37, reaching the regulatory market size of 50 mm at approximately 18 months, with an estimated 2.92 year maximum longevity. Total mortality, corresponding to natural mortality M, was calculated as Z = 1.40/year.
珍珠牡蛎是南美洲东北海岸丰富的双壳类动物，在加勒比海形成密集的浅滩，在那里它们被开发用于销售，使它们成为委内瑞拉东北部的宝贵资源。2012年4月至2013年1月，对拉雷斯廷加泻湖的平锥虫生长、大小结构、状态指数和自然死亡率进行了研究。每月通过自由潜水在约200米的线性样带上随机采集40个珍珠牡蛎样本。总长度和总重比呈负异速生长。在几乎所有的采样月份均呈现多模态分布，总长度在21.56 ~ 54.61 mm之间。在大多数月份观测到的模态峰值在24 - 28毫米之间，表明全年持续增加。月状况指数的峰值出现在2012年5月，最小值出现在2012年11月。生长参数L∞= 68.5 mm, K = 1.18/年，t0 = 0.37，在大约18个月时达到50 mm的监管市场规模，估计最大寿命为2.92年。总死亡率，对应自然死亡率M，计算为Z = 1.40/年。
{"title":"Aspectos biológicos básicos de Pinctada imbricata (Bivalvia: Pteriidae) en la laguna de La Restinga, isla de Margarita, Venezuela","authors":"Gladys Vásquez, Roberta Crescini, W. Villalba, J. Mogollón, L. Tróccoli","doi":"10.15359/REVMAR.7.8","DOIUrl":"https://doi.org/10.15359/REVMAR.7.8","url":null,"abstract":"Pearl oysters are abundant bivalves in the northeastern coast of South America that form dense shoals in the Caribbean Sea, where they are exploited for marketing, making them a valuable resource in northeastern Venezuela. In order to provide information on Pinctada imbricata in the La Restinga Lagoon, its growth, size structure, condition index and natural mortality were estimated from April 2012 to January 2013. A total of 40 random samples of pearl oysters were collected on a monthly basis by freediving in a linear transect of approximately 200 m. The total length and total weight ratio indicated a negative allometric growth. A multimodal distribution was shown in almost all sampling months, with sizes ranging between 21.56 and 54.61 mm of total length. The modal peak observed in most of the months was between 24 and 28 mm, indicating a continuous recruitment throughout the year. The maximum peak of the monthly condition index was in May 2012, while the minimum was in November 2012. Growth parameters were L∞ = 68.5 mm, K = 1.18/year and t0 = 0.37, reaching the regulatory market size of 50 mm at approximately 18 months, with an estimated 2.92 year maximum longevity. Total mortality, corresponding to natural mortality M, was calculated as Z = 1.40/year.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"7 1","pages":"117-132"},"PeriodicalIF":0.2,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.7.8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Compensatory growth and production of Litopenaeus vannamei in commercial cultures in farms in the Gulf of Nicoya, Costa Rica, during 2014 were evaluated in this study. Growth and production were compared between three culture systems starting from an initial maternity (MA) phase with high stocking density (85/m2) of post larvae: a) maternity-development (MA-DE) with a medium stocking density (23.3/m2) and an initial weight of 1.4 g, b) maternity-development-grow-out (MA-DE-G) with a low density (8.6/m2) and an initial weight of 6.0 g and c) maternity-grow-out (MA-G) (9.4/m2 and 1.4 g). An increase in growth was recorded in MA-DE (0.85 g/week) as compared to MA (0.26 g/week), and the specific growth rate (SGR) was 3.73 %g/day for MA-DE. Survival (81.0%) and production (1 029 kg/ha) in MA-DE were higher than in MA (75.3% and 842 kg/ha, respectively). Weekly growth showed no differences between both grow-out systems: MA-G = 1.07 and MA-DE-G = 1.02 g/week; however, SGR was lower in MA-DE-G (1.51 %g/day) than in MA-G (3.19 %g/day). Results indicate the lack of compensatory growth from MA to MA-DE, and from MA-DE to MA-DE-G, while partial compensatory growth was recorded from MA to MA-G. Taken into account this compensatory growth gain in juveniles, the culture of L. vannamei in MA at high density seems to be a good production strategy.
{"title":"Crecimiento compensatorio y producción en las fases de precría, preengorde y engorde comercial del camarón blanco, Litopenaeus vannamei, en Costa Rica","authors":"J. Valverde-Moya, Jorge Alfaro-Montoya","doi":"10.15359/REVMAR.7.7","DOIUrl":"https://doi.org/10.15359/REVMAR.7.7","url":null,"abstract":"Compensatory growth and production of Litopenaeus vannamei in commercial cultures in farms in the Gulf of Nicoya, Costa Rica, during 2014 were evaluated in this study. Growth and production were compared between three culture systems starting from an initial maternity (MA) phase with high stocking density (85/m2) of post larvae: a) maternity-development (MA-DE) with a medium stocking density (23.3/m2) and an initial weight of 1.4 g, b) maternity-development-grow-out (MA-DE-G) with a low density (8.6/m2) and an initial weight of 6.0 g and c) maternity-grow-out (MA-G) (9.4/m2 and 1.4 g). An increase in growth was recorded in MA-DE (0.85 g/week) as compared to MA (0.26 g/week), and the specific growth rate (SGR) was 3.73 %g/day for MA-DE. Survival (81.0%) and production (1 029 kg/ha) in MA-DE were higher than in MA (75.3% and 842 kg/ha, respectively). Weekly growth showed no differences between both grow-out systems: MA-G = 1.07 and MA-DE-G = 1.02 g/week; however, SGR was lower in MA-DE-G (1.51 %g/day) than in MA-G (3.19 %g/day). Results indicate the lack of compensatory growth from MA to MA-DE, and from MA-DE to MA-DE-G, while partial compensatory growth was recorded from MA to MA-G. Taken into account this compensatory growth gain in juveniles, the culture of L. vannamei in MA at high density seems to be a good production strategy.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"7 1","pages":"99-115"},"PeriodicalIF":0.2,"publicationDate":"2015-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.7.7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Espino-Barr, M. Gallardo-Cabello, E. G. Cabral-Solís, M. Puente-Gómez, A. Garcia-Boa
Yellowfin Mojarra Gerres cinereus (Walbaum, 1792) off the Mexican Pacific coast is a popular low-cost species, which is caught with gill and cast nets. Knowing breeding seasons, gonadal maturity, fecundity and size at sexual maturity is necessary for fishery management. Samples were obtained from April 2010 to November 2011. Size, sex and gonad maturity were recorded, while the gonadosomatic index and the fecundity and condition factors were calculated using the gravimetric method. To calculate this information by age, growth parameters previously published were used. The female:male ratio was 1:1.024. Mature females were observed year round with two major peaks during July and October. Sexual maturation (L0.5) of males and females was 16.40 cm and 20.20 cm, respectively, corresponding to one-year old organisms. First maturity length (L0.25) was 15.80 cm in males and 16.50 cm in females. The hepatosomatic index vs length was LW = 2.00·10-6 ·TL4.213, resulting in a positive allometric relationship. Condition factor indexes increased during February and September. Average oocyte diameter was 0.31 mm (0.15 to 0.45 mm). Fecundity ranged from 37,784 to 1,746,510 oocytes in females from one to seven years of age, and mean relative fecundity was 1332 oocytes·g-1 (294 to 4,430 oocytes·g-1). G. cinereus has an early sexual maturity, reproduces once or twice a year and has a high fecundity rate, which allows it to be caught all year round, if caught after the first maturity length.
{"title":"Reproduction of Gerres cinereus (Percoidei: Gerreidae) off the Mexican Pacific coast","authors":"E. Espino-Barr, M. Gallardo-Cabello, E. G. Cabral-Solís, M. Puente-Gómez, A. Garcia-Boa","doi":"10.15359/REVMAR.7.6","DOIUrl":"https://doi.org/10.15359/REVMAR.7.6","url":null,"abstract":"Yellowfin Mojarra Gerres cinereus (Walbaum, 1792) off the Mexican Pacific coast is a popular low-cost species, which is caught with gill and cast nets. Knowing breeding seasons, gonadal maturity, fecundity and size at sexual maturity is necessary for fishery management. Samples were obtained from April 2010 to November 2011. Size, sex and gonad maturity were recorded, while the gonadosomatic index and the fecundity and condition factors were calculated using the gravimetric method. To calculate this information by age, growth parameters previously published were used. The female:male ratio was 1:1.024. Mature females were observed year round with two major peaks during July and October. Sexual maturation (L0.5) of males and females was 16.40 cm and 20.20 cm, respectively, corresponding to one-year old organisms. First maturity length (L0.25) was 15.80 cm in males and 16.50 cm in females. The hepatosomatic index vs length was LW = 2.00·10-6 ·TL4.213, resulting in a positive allometric relationship. Condition factor indexes increased during February and September. Average oocyte diameter was 0.31 mm (0.15 to 0.45 mm). Fecundity ranged from 37,784 to 1,746,510 oocytes in females from one to seven years of age, and mean relative fecundity was 1332 oocytes·g-1 (294 to 4,430 oocytes·g-1). G. cinereus has an early sexual maturity, reproduces once or twice a year and has a high fecundity rate, which allows it to be caught all year round, if caught after the first maturity length.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"7 1","pages":"83-98"},"PeriodicalIF":0.2,"publicationDate":"2015-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15359/REVMAR.7.6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper is aimed at describing spatio-temporal variation in abundance, size structure and length-weight relationship of a Donax denticulatus population at Levisa Beach on the Southeastern coast of Cuba. From April to September 2008, monthly samples were collected from four stations located along the beach; three strata were established across the intertidal zone of each station. Three replicate sediment samples were collected from each stratum with a 0.025 m2 PVC corer and sieved with a 1 mm mesh. Mean density ranged from 612.2 to 1366.7 ind. m-2, and no differences were found among the sampled months but rather among strata. There is a relationship between the abundance of recruits, young and adults, and strata. The middle intertidal zone showed the highest proportion of individuals, mainly young and adults. Monthly length frequencies showed that recruits appeared in April and May. Length-weight relationship showed a significant correlation between these variables; however, the allometric coefficient value is different considering different life stages. This population shows potential to be exploited, but some management measures proposed in this paper must be taken into account to ensure sustainability.
{"title":"Abundancia y crecimiento relativo de Donax denticulatus (Bivalvia: Donacidae) en playa Levisa, costa sur oriental de Cuba","authors":"Frank A. Ocaña, Yuself R. Cala, Y. C. Apín","doi":"10.15359/revmar.7.5","DOIUrl":"https://doi.org/10.15359/revmar.7.5","url":null,"abstract":"This paper is aimed at describing spatio-temporal variation in abundance, size structure and length-weight relationship of a Donax denticulatus population at Levisa Beach on the Southeastern coast of Cuba. From April to September 2008, monthly samples were collected from four stations located along the beach; three strata were established across the intertidal zone of each station. Three replicate sediment samples were collected from each stratum with a 0.025 m2 PVC corer and sieved with a 1 mm mesh. Mean density ranged from 612.2 to 1366.7 ind. m-2, and no differences were found among the sampled months but rather among strata. There is a relationship between the abundance of recruits, young and adults, and strata. The middle intertidal zone showed the highest proportion of individuals, mainly young and adults. Monthly length frequencies showed that recruits appeared in April and May. Length-weight relationship showed a significant correlation between these variables; however, the allometric coefficient value is different considering different life stages. This population shows potential to be exploited, but some management measures proposed in this paper must be taken into account to ensure sustainability.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":"7 1","pages":"73-82"},"PeriodicalIF":0.2,"publicationDate":"2015-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66946188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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