Reproduction of Pimelodus maculatus(Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil

The alterations to the hydrologic regime downstream from hydroelectric dams may cause an impact on the reproductive success of fishes. This study aimed to analyse the influence of the physical and chemical parameters of the water of the Grande and Pardo Rivers on gonadal maturation, oocyte diameter, follicular atresia and biological indices of Pimelodus maculatus collected from three river sections: Grande River, downstream from the Porto Colômbia dam (S1), Grande River, downstream from the confluence with the Pardo River (S2) and in the Pardo River channel (S3). Males and females captured in S1 presented significantly higher average values for total length and body weight than those captured in S2 and S3. The gonadosomatic index values were significantly higher in fish collected in S3 and the Fulton condition factor did not show significant differences in fish collected from the three sections. The oocyte diameter, the follicular cells height and the zona pellucida thickness did not show any statistical differences between the sections. Conductivity presented a significant difference between S1 and S3 and during the reproductive period, water transparency presented similar values in the two sampling sections of the Grande River, but a much lower value in the Pardo River. A low frequency of fish with reproductive activity was registered in S1, whereas in S2 and S3 higher frequencies were recorded, emphasising the need of preserving the tributaries for the reproductive success of P. maculatus of the Grande River in south-eastern Brazil.

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Feeding habits of the franciscana dolphin (Pontoporia blainvillei) in south-eastern Brazil

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315420000120 ◽

2020 ◽

Vol 100 (2) ◽

pp. 301-313

Author(s):

Laura Busin Campos ◽

Xênia Moreira Lopes ◽

Ednilson da Silva ◽

Marcos César de Oliveira Santos

Keyword(s):

Feeding Habits ◽

Stomach Contents ◽

Small Fish ◽

South Eastern ◽

Important Prey ◽

Fishing Vessels ◽

Eastern Brazil ◽

Significant Difference ◽

Pontoporia Blainvillei ◽

Franciscana Dolphin

AbstractThis study evaluated the feeding habits of the franciscana dolphin (Pontoporia blainvillei) in south-eastern Brazil. Stomach contents were collected from a total of 145 dead specimens found incidentally caught by fishing vessels or stranded between 2005 and 2015. Fish otoliths, cephalopod beaks and whole non-digested prey were used for prey species identification. A total of 9337 prey items were identified, including 26 species of teleost fishes and three species of cephalopods. The most important prey families were Sciaenidae among fish and Loliginidae among cephalopods. Franciscana dolphins tended to feed on small fish (mean = 5.25 cm) and cephalopods (mean = 8.57 cm). The index of relative importance (IRI) showed that Pellona harroweri and Doryteuthis plei were the most important prey for both males and females. The PERMANOVA test confirmed that there is no significant difference between the feeding habits of different sexes, but detected a significant difference among seasons. Overall, our results show that franciscana dolphins are predominantly ichthyophagous and non-selective in relation to the type of prey, feeding on pelagic, demersal and pelagic-demersal prey.

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Some biological characteristics of the smooth blaasop puffer fish Lagocephalus inermis (Temminck and Schlegel, 1850), from south-eastern Arabian Sea

Indian Journal of Fisheries ◽

10.21077/ijf.2020.67.4.99966-04 ◽

2020 ◽

Vol 67 (4) ◽

Author(s):

Purbali Saha ◽

Sujitha Thomas

Keyword(s):

Sex Ratio ◽

Arabian Sea ◽

Condition Factor ◽

Gonadosomatic Index ◽

Hepatosomatic Index ◽

Fishery Resource ◽

South Eastern ◽

Significant Difference ◽

Eastern Arabian Sea ◽

Puffer Fish

Length-weight relationship (LWR), condition factor, sex ratio, gonadosomatic index (GSI) hepatosomatic index (HSI) of the smooth blaasop puffer fish Lagocephalus inermis (Temminck and Schlegel, 1850), an emerging fishery resource along south-eastern Arabian Sea were studied from 1,722 samples collected during August 2017-May 2019 from Mangalore Fishing Harbour, Karnataka, India. LWR indicated negative allometric growth [W = 0.034805L2.76 (males); W = 0.033574L2.78 (females), W = 0.033979L2.77 (pooled)] and significant difference was observed in the b value of the fishes. Sex ratio was 1:1.08. The ratio was unusually high during post-monsoon and Chi-square test revealed that the monthly sex ratio did not vary significantly throughout the year except for December and January (p<0.01). Condition factor (K) and relative condition factor (Kn ) also were not significantly different between sexes. Two peak spawning seasons were identified - NovemberFebruary and August. The GSI was highest in August (female = 8.08 and male = 5.82) and lowest in May (female = 3.32 and male = 3.49). The HSI value was found to be inversely related to GSI and was highest in May (5.21) and lowest in August (3.99). These parameters are essential pre-requisites for stock assessment and sustainable management of the fishery resource.

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Reproductive dynamics of Lycengraulis grossidens (Clupeiformes: Engraulidae) and Platanichthys platana (Clupeiformes: Clupeidae) in a subtropical coastal lagoon

Brazilian Journal of Biology ◽

10.1590/1519-6984.170155 ◽

2017 ◽

Vol 78 (3) ◽

pp. 477-486 ◽

Cited By ~ 1

Author(s):

C. A. Lopes ◽

D. A. Reynalte-Tataje ◽

A. P. O. Nuñer

Keyword(s):

Fish Species ◽

Coastal Lagoon ◽

Abiotic Factors ◽

Gonadosomatic Index ◽

Sampling Period ◽

Reproductive Activity ◽

Water Transparency ◽

Chi Square ◽

Positive Correlation ◽

Significant Difference

Abstract We evaluated the reproductive dynamics of two fish species, Lycengraulis grossidens and Platanichthys platana, in a subtropical freshwater coastal lagoon (Peri Lagoon) in Brazil. Samples were collected from nine sites every two months from June 2008 to April 2012. Different fishing methods were used to capture larvae, juveniles, and adults. Limnological variables were obtained using multiparameter probe. More females than males were collected of both fish species and the chi-square test (χ2) was used to confirm that the sex ratio was female-biased. Large numbers of maturing and mature fishes were observed in almost every sampling month. The gonadosomatic index (GSI) of L. grossidens was the highest in August, October, and December for females and in October for males, and no significant difference was found across years. The GSI of P. platana showed no significant difference across months for either sex; however, significant differences were recorded in year three (June 2010-April 2011) and year four (June 2011-April 2012) for females and in year three (June 2010-April 2011) for males. For both species, GSI was negatively correlated with temperature and water level. L. grossidens larvae were more abundant in October 2010, showing a positive correlation with water transparency, whereas P. platana larvae were more abundant in June 2011, showing a positive correlation with water transparency and negative correlation with temperature and precipitation. Both species were represented by different stages, including larvae, which confirm that these species reproduce in Peri Lagoon. Reproduction was more pronounced in autumn and winter; however, reproductive activity was evident throughout the sampling period. In conclusion, our results show that abiotic factors strongly influence the temporal pattern of reproductive activity and larval assemblages of both L. grossidens and P. platana in Peri Lagoon, Brazil.

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Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil

Biota Neotropica ◽

10.1590/s1676-06032011000300014 ◽

2011 ◽

Vol 11 (3) ◽

pp. 171-178 ◽

Cited By ~ 6

Author(s):

Dayani Bailly ◽

Valéria Flávia Batista-Silva ◽

Milza Celi Fedatto Abelha ◽

Elaine Antoniassi Luiz Kashiwaqui ◽

Carlos Alexandre Fernandes ◽

...

Keyword(s):

Relative Abundance ◽

National Park ◽

Reproductive Activity ◽

Reproductive Period ◽

Spatial And Temporal Variation ◽

Oocyte Diameter ◽

Reproductive Tactics ◽

Abundance Patterns ◽

Upper Paraná River Floodplain ◽

Autumn And Winter

This study aimed to evaluate population abundance patterns and the main events in the reproductive cycle of Loricariichthys platymetopon at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil. Monthly samplings were conducted from October 2004 to September 2005 in three sections of the lagoon: entrance, middle and end, which resulted in the capture of 175 individuals. Spatial and temporal variation in abundance was obtained through CPUE (number of captured individuals/1000 m² of gillnets in 12 hours). The reproductive tactics considered were: duration, time and location of spawning, oocyte diameter and fecundity. The highest relative abundance was recorded in February, in the middle section of the lagoon, and the reproductive period lasted from September to February. The prevalence of females with spent ovaries and at rest in the following months indicated that reproductive activity ceased during autumn and winter. We observed that reproduction was high at the end section of the lagoon. The recorded mean oocyte diameter was 1.67 (SD ± 0.76) mm, mean absolute fecundity was 962.1 (SD ± 382.48) oocytes, and relative fecundity was 7.60 (SD ± 2.25) oocytes/g and 5.13 (SD ± 0.75) oocytes/cm. These tactics, probably are related to the settlement of L. platymetopom in Saraiva Lagoon, as well as in the different biotopes of the Upper Paraná River floodplain.

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The influence of population structure and reproductive aspects of the genus Stellifer (Oken, 1817) on the abundance of species on the southern Brazilian coast

Brazilian Journal of Biology ◽

10.1590/s1519-69842011000500019 ◽

2011 ◽

Vol 71 (4) ◽

pp. 991-1002 ◽

Cited By ~ 8

Author(s):

JL. Rodrigues-Filho ◽

JR. Verani ◽

AC. Peret ◽

LM. Sabinson ◽

JO. Branco

Keyword(s):

Activity Index ◽

Gonadosomatic Index ◽

Reproductive Activity ◽

Reproductive Period ◽

Brazilian Coast ◽

Effective Population ◽

Chi Square ◽

Chi Square Test ◽

First Maturity ◽

The Relationship

The differences between abundance and the relationship with aspects of population and reproductive Stellifer rastrifer, Stellifer stellifer and Stellifer brasiliensis were analysed. Data were collected monthly trawl directed for capture of seabob shrimp in Armação do Itapocoroy, an important fishing area on the southern Brazilian coast. The chi-square test showed that the population of S. rastrifer presented values of capture significantly higher than others in all evaluated periods. The frequency distribution of total length curves combined with records of the size at first maturity (L50) showed that S. rastrifer is a species with a majority of the adults effectively participating in the reproductive period. The frequency of occurrence of individuals in reproduction monthly examined together with changes in the gonadosomatic index (GSI) and the reproductive activity index indicated that spring was the main breeding season for the three species. However, it was observed that the reproductive period of S. rastrifer was more pronounced and more extensive than that of its congeners, apparently providing it with ecological advantages and enabling a more effective population balance given the pressure exerted by fishing in the study area.

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Reproduction of Carangoides vinctus (Perciformes: Carangidae) in the Mexican Central Pacific

Latin American Journal of Aquatic Research ◽

10.3856/vol44-issue3-fulltext-20 ◽

2017 ◽

Vol 44 (3) ◽

pp. 610-622

Author(s):

Gabriela Lucano-Ramírez ◽

Estrella G. Rivera-Rios ◽

Salvador Ruiz-Ramírez ◽

Gaspar González-Sansón ◽

Alejandro Perez-Toledo

Keyword(s):

Sexual Maturity ◽

Gonadosomatic Index ◽

Reproductive Period ◽

Oocyte Diameter ◽

Central Pacific ◽

Gonadal Maturity ◽

Three Stages ◽

Development Phases ◽

Post Spawning ◽

Average Catch

This study aims to determine some aspects of the reproduction of Carangoides vinctus, a species caught by the artisanal fishery on the south coast of Jalisco. The captures were made monthly with gillnets from January 1998 to December 2008. The organisms had total length of 17.0 to 41.2 cm, with females averaging 30.1 cm and 30.5 cm males. The sex ratio was 1.0: 1.1 males per females, which is not significantly different from the expected 1:1. A gonadal maturity scale of four stages for both sexes (immature, developing, spawning capable and post-spawning or spent) was used. In the first three stages of the ovary’s development, a septum dividing each lobe was present. In the analysis of oogenesis, seven oocyte development phases were identified and the oocytes developed asynchronously within the ovary. Based on the microscopic characteristics observed in the testis, it showed a lobular type development. The maximum values of the gonadosomatic index, the percentage of mature gonads and the oocyte diameter suggest that C. vinctus has a reproductive period from March to May. The length at sexual maturity (L50) was estimated at 26.04 and 23.77 cm for females and males, respectively; these sizes are lower than the average catch size in both sexes, suggesting that organisms are caught commercially when they have reached sexual maturity.

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The coexistence of two frugivorous bat species and the phenology of their food plants in Brazil

Journal of Tropical Ecology ◽

10.1017/s0266467400005083 ◽

1991 ◽

Vol 7 (1) ◽

pp. 59-67 ◽

Cited By ~ 65

Author(s):

Jader S. Marinho-Filho

Keyword(s):

Resource Partitioning ◽

Feeding Habits ◽

Food Resources ◽

Food Plants ◽

Carollia Perspicillata ◽

High Productivity ◽

South Eastern ◽

Eastern Brazil ◽

Significant Difference ◽

Almost All

ABSTRACTCarollia perspicillata and Sturnira lilium are two species of abundant and widely distributed phyllostomid bats. Both are frugivorous and frequently found coexisting in the same areas. A study on feeding habits and morphology of C. perspicillata and S. lilium was conducted at Serra do Japi, Sấo Paulo, south-eastern Brazil, investigating the mechanisms associated with their coexistence. The two species are fairly similar in morphology and feeding habits. Analysis of faeces produced by captured bats revealed that there is a significant difference in diet between the two species. C. perspicillata tends to specialize in fruits of the genus Piper and S. lilium specializes in Solarium fruits. The fruiting periods of the four species of Piper eaten by bats at the study site are successive, with little overlap and high productivity. The species of Solarium have long and overlapping fruiting periods, with very low productivity. Piper and Solarium provide food resources almost all year, allowing the food specialization that may be an important mechanism of resource partitioning between C. perspicillata and S. lilium.

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Reproductive biology of Hyphessobrycon eques (Characiformes: Characidae) in Southern Pantanal, Brazil

Brazilian Journal of Biology ◽

10.1590/1519-6984.176273 ◽

2019 ◽

Vol 79 (1) ◽

pp. 70-79 ◽

Cited By ~ 1

Author(s):

C. A. Santana ◽

K. K. Tondato ◽

Y. R. Súarez

Keyword(s):

Significant Variation ◽

Gonadosomatic Index ◽

Reproductive Traits ◽

Reproductive Activity ◽

Reproductive Period ◽

Angular Coefficient ◽

Rapid Population Growth ◽

Average Temperature ◽

Average Fecundity ◽

Favorable Conditions

Abstract Population and reproductive aspects allow the knowledge and understanding of population dynamics and the influence of environmental factors, in addition to ensure the success of a species continuity. Thus, the aim of this study was to analyze population and reproductive traits of the species Hyphessobrycon eques in southern Pantanal, Brazil. Monthly samplings were conducted from February/2009 to January/2011, with 617 individuals analyzed, being 365 females and 262 males. A similar form of distribution in length and weight between the sexes was observed. There was no significant variation in sex ratio over time, with higher proportion of females during the entire sampled period. Both sexes presented a angular coefficient of Weight/Length (b) relationship greater than 3, with speed of increase in weight greater than in length. For females, a long reproductive period was observed, with greater reproductive intensity from January through June. No significant correlation was observed between the Gonadosomatic Index (GSI) and the average temperature, rainfall and river level, despite the fact that reproductive activity occurs in autumn/winter, when there are favorable conditions due to flooding. The size at first maturation (L50) was 20.2 mm, with confidence interval varying from 19.7 through 20.7 mm. The average fecundity was 191.9 oocytes/females and was significantly related to the standard length and total weight (g), demonstrating a relation with energy accumulation to invest in reproduction. The long reproductive period, intensified by partial spawning, higher proportion of females and low L50, show that the species has strategies necessary for survival and rapid population growth, common in small species characterized as r-strategists.

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Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae) in the Igarapava Reservoir, Grande River, Southeast Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252007000200008 ◽

2007 ◽

Vol 5 (2) ◽

pp. 147-152 ◽

Cited By ~ 9

Author(s):

Bruno Pereira Maia ◽

Sandra Maria Franco Ribeiro ◽

Paula Maciel Bizzotto ◽

Volney Vono ◽

Hugo Pereira Godinho

Keyword(s):

Ovarian Tissue ◽

Gonadosomatic Index ◽

Reproductive Activity ◽

Mature Stage ◽

Commercial Fish ◽

Hydroelectric Reservoirs ◽

Southeast Brazil ◽

Se Brazil ◽

Pimelodus Maculatus

The catfish yellow-mandi, Pimelodus maculatus, is a valuable sporting and commercial fish of inland waters of Southeast Brazil including Igarapava Reservoir. It is a short-distance migrant that needs shorter stretches of free-flowing river to spawn compared to other Neotropical migrants. Igarapava Reservoir is one the 13 hydroelectric reservoirs, arranged in a cascade fashion, impounding the 1,300 km-long Grande River, SE Brazil. In this paper, we examined reproductive features and recruitment of the yellow-mandi in Igarapava Reservoir. We also evaluated the role of the Igarapava Fish Ladder (IFL) built around Igarapava Dam on the sustainability of its fisheries. Female adult yellow-mandis that were gill netted (nets of 8-20 cm stretch-mesh) during the reproductive season of 2002/2003, showed adequate ovarian development, indicated by the gonadosomatic index (12.9 ± 2.1, at mature stage) and absolute fecundity (413,794 ± 206,259; range = 125,601-742,026), which were higher than those found in the literature. Postovulatory follicles present in ovarian tissue of 32% of the females examined showed that they possibly could have spawned in the reservoir area. Gill nets of 3-5 cm stretch-mesh aimed at capturing juvenile yellow-mandi were unproductive. These results indicated that Igarapava Reservoir and its reduced catchment area did not provide adequate conditions for recruitment of the yellow-mandi. This fish, the most abundant in the IFL, and those reaching the reservoir tended to remain there since no upstream passage mechanism is present. Thus, the IFL apparently was responsible for maintaining the Igarapava Reservoir stock of yellow-mandi.

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Reproductive biology of Parona signata (Actinopterygii: Carangidae), a valuable economic resource, in the coastal area of Mar del Plata, Buenos Aires, Argentina

Neotropical Ichthyology ◽

10.1590/1982-0224-2019-0133 ◽

2020 ◽

Vol 18 (3) ◽

Author(s):

Santiago Julián Bianchi ◽

Mariano González-Castro

Keyword(s):

Reproductive Biology ◽

Histological Analysis ◽

Gonadosomatic Index ◽

Reproductive Activity ◽

Diameter Distribution ◽

Oocyte Diameter ◽

Economic Resource ◽

Multiple Spawner ◽

Maturation Stages ◽

Female Relative

ABSTRACT The reproductive biology and life cycle of Parona leatherjacket, Parona signata, present in Mar del Plata (38º 00’S 57º 33’W) coast, was studied. Samples were obtained monthly since January 2018 to February 2019 from the artisanal fishermen and the commercial fleet of Mar del Plata. A histological analysis was carried out and the main biologic-reproductive parameters were estimated: fecundity, oocyte frequency distribution and gonadosomatic index (GSI). Both the macroscopic and microscopic analyses showed reproductive activity in March and November. Mature females were recorded, which showed hydrated oocytes, as was evidenced by the histological procedures. Both, the histological and the oocyte diameter distribution analyses showed the presence of all oocyte maturation stages in ovaries in active-spawning subphase, indicating that P. signata is a multiple spawner with indeterminate annual fecundity. Batch fecundity ranged between 36,426 and 126,035 hydrated oocytes/ female. Relative fecundity ranged between 42 and 150 oocytes/ g female ovary free.

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