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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}
Alejandro Espinoza-Tenorio, Gabriela Montaño-Moctezuma, I. Espejel
Ecosystem-based management (EBM) is one of the main paradigms under which the world’s fisheries have been redesigned. However, successful implementation of EBM has been limited due to the inherent complexity of ecological systems as well as the need to have enough information to build and analyze complex models. To successfully implement EBM in fisheries, countries such as Mexico need to design and promote management tools consistent with their social and natural context in a way that they can take advantage of the capabilities of their fishery systems. In this paper we used a qualitative model (Loop Analysis) to examine the ecosystem implications of fishery on some members of a marine community. A model for the biological community of the Northern Gulf of California (NGC) was constructed, based on six fishery groups and a conservation group. Model predictions allowed assessing both direct and indirect effects from harvesting different fishery groups, as well as identifying those fisheries that might present a conflict when operating simultaneously. The qualitative nature of the model allowed incorporating local ecological knowledge (LEK) as a source of information, fostering the future involvement of stakeholders in the design of management strategies. The proposed ideas may be useful to generate goals regarding resource exploitation and conservation and also provide a guide to generate management strategies based on the knowledge of the ecosystem.
{"title":"Un modelo cualitativo de la comunidad biológica del Norte del Golfo de California, México: posibles efectos de la explotación pesquera en el ecosistema","authors":"Alejandro Espinoza-Tenorio, Gabriela Montaño-Moctezuma, I. Espejel","doi":"10.15359/REVMRA.7.4","DOIUrl":"https://doi.org/10.15359/REVMRA.7.4","url":null,"abstract":"Ecosystem-based management (EBM) is one of the main paradigms under which the world’s fisheries have been redesigned. However, successful implementation of EBM has been limited due to the inherent complexity of ecological systems as well as the need to have enough information to build and analyze complex models. To successfully implement EBM in fisheries, countries such as Mexico need to design and promote management tools consistent with their social and natural context in a way that they can take advantage of the capabilities of their fishery systems. In this paper we used a qualitative model (Loop Analysis) to examine the ecosystem implications of fishery on some members of a marine community. A model for the biological community of the Northern Gulf of California (NGC) was constructed, based on six fishery groups and a conservation group. Model predictions allowed assessing both direct and indirect effects from harvesting different fishery groups, as well as identifying those fisheries that might present a conflict when operating simultaneously. The qualitative nature of the model allowed incorporating local ecological knowledge (LEK) as a source of information, fostering the future involvement of stakeholders in the design of management strategies. The proposed ideas may be useful to generate goals regarding resource exploitation and conservation and also provide a guide to generate management strategies based on the knowledge of the ecosystem.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2015-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66946311","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}
A new species of the genus Amathillopsis is described. Main characteristics include the absence of eyes, accessory flagellum 1-segmented, distally emarginate telson, medial dorsal spinous process on pereionites 4-7, pleonites 1-3 and urosomite 1. This is the first record of a species of the family Amathillopsidae Pirlot, 1934 for the Caribbean Sea.
{"title":"Primer hallazgo de la familia Amathillopsidae Pirlot, 1934 (Crustacea, Amphipoda, Gammaridea), en el Mar Caribe, con la descripción de una especie nueva","authors":"C. Varela","doi":"10.15359/REVMAR.7.3","DOIUrl":"https://doi.org/10.15359/REVMAR.7.3","url":null,"abstract":"A new species of the genus Amathillopsis is described. Main characteristics include the absence of eyes, accessory flagellum 1-segmented, distally emarginate telson, medial dorsal spinous process on pereionites 4-7, pleonites 1-3 and urosomite 1. This is the first record of a species of the family Amathillopsidae Pirlot, 1934 for the Caribbean Sea.","PeriodicalId":52058,"journal":{"name":"REVMAR-Revista Ciencias Marinas y Costeras","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2015-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66946163","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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