scholarly journals Population dynamics and reproductive traits of the ornamental crab Porcellana sayana: implications for fishery management and aquaculture

2013 ◽  
Vol 1 (1) ◽  
pp. 1-12 ◽  
Author(s):  
J Antonio Baeza ◽  
M Furlan ◽  
AC Almeida ◽  
SdP Barros-Alves ◽  
DFR Alves ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Fishery Management ◽  
Reproductive Traits

scholarly journals Fecundity, histomorphology of the ovary and size at first maturity of Neolissochilus hexagonolepis (McClelland) in Tamor River, Nepal

2020 ◽  
Vol 12 (3) ◽  
pp. 401-410
Author(s):  
Suren Subba ◽  
Vinod Kumar Mahaseth ◽  
Bharat Raj Subba ◽  
Shyam Narayan Labh
Keyword(s):  
Fishery Management ◽  
Fork Length ◽  
Reproductive Traits ◽  
Breeding Period ◽  
Absolute Fecundity ◽  
Fish Samples ◽  
Measuring Tape ◽  
The Mean ◽  
First Maturity ◽  
Size At First Maturity

Neolissochilus hexagonolepis (McClelland, 1839) is one among the notable species in snow-fed torrential rivers of Nepal. The present study attempts to investigate some reproductive traits of N. hexagonolepis, including the length at first maturity, fecundity and its relationships with biometric variables like lengths (TL, SL, and FL) and weights (TW and OW) of the fish in the mid-reaches of Tamor River, Nepal. A total of 109 fish samples were collected from the river. For each individual, total length (TL), standard length (SL) and fork length (FL) were measured in a fully stretched condition to the nearest 1mm using a measuring tape and graduated ruler, while total weight (TW) and ovary weight (OW) was measured using a digital balance with the precision of 0.01 g. The mean absolute fecundity (F) was 8356.44 ± 4612.59 and ranged from 2398.6 to 20160. SL was more significantly correlated with absolute fecundity (R2=0.59; p<0.001) than other body metrics. The results showed that female individuals of N. hexagonolepis attained the first sexual maturity at TL 32.9 cm. N. hexagonolepis exhibited a protracted breeding period with its ovaries passing through six different stages of maturation. The finding of the present study may serve as a protocol for fishery biologists and managers to promulgate adequate regulations for continual fishery management in the River Tamor, Nepal.

Reproductive traits and seasonal variability ofMerluccius merlucciusfrom the Tunisian coast

2014 ◽  
Vol 94 (7) ◽  
pp. 1545-1556 ◽  
Author(s):  
Widien Khoufi ◽  
Rosalia Ferreri ◽  
Héla Jaziri ◽  
Safouène El Fehri ◽  
Antonella Gargano ◽  
...  
Keyword(s):  
Seasonal Variability ◽  
Fishery Management ◽  
Somatic Growth ◽  
Reproductive Traits ◽  
North African ◽  
Spawning Period ◽  
Tunisian Coast ◽  
The North ◽  
Significant Relationships ◽  
First Maturity

Merluccius merlucciusis an economically and ecologically important demersal species inhabiting the Atlantic Ocean and the Mediterranean Sea; however, reproductive knowledge about this species, along the North African coast is still missing. Monthly samples were collected from November 2010 to October 2011 along the North Tunisian coast. Morphometric parameters were measured, and histological preparations of gonadic tissues provided detailed information on the reproductive biology. Ovary maturity data showed a protracted spawning season throughout the year, with peaks in January, April and August. In females ofM. merluccius, seasonal variability in weight and length were noticed, with higher values in the first part of the study period (November–April) than from May to October. Analysing separately these two periods, significant relationships were observed between gonadic maturation indices and the somatic and gonadic indices, suggesting a seasonal differential use of energy intake. From November to May the fish alternate the use of their energy for body growth and reserves for later uses (i.e fat, muscle and liver mass) or for gonadic growth. From June to October the energy is converted mainly into gonad weight and less to somatic growth. The maturity ogives obtained by macroscopic and histological maturity staging methods showed significant differences; however, in both cases the length at first maturity estimates were around 29 cm. Nonetheless, when selecting the main spawning period, theL50estimation was heavily reduced to 24 cm, suggesting careful attention in the selection of the samples to be used specially for fishery management purposes.

Population dynamics of the crab Hepatus pudibundus (Herbst, 1785) (Decapoda, Aethridae) on the southern coast of São Paulo state, Brazil

2018 ◽  
Vol 99 (4) ◽  
pp. 867-878 ◽  
Author(s):  
Lizandra Fernandes Miazaki ◽  
Sabrina Morilhas Simões ◽  
Antonio Leão Castilho ◽  
Rogério Caetano Costa
Keyword(s):  
Population Dynamics ◽  
Fishery Management ◽  
Growth Parameters ◽  
Sao Paulo ◽  
São Paulo ◽  
Juvenile Period ◽  
Trawl Fishery ◽  
Paulo State ◽  
Fishing Boat ◽  
São Paulo State

AbstractThe present study investigated the population dynamics of Hepatus pudibundus in the Cananéia region, in southern São Paulo state, Brazil, focusing on population structure, growth parameters, longevity, sex ratio, reproduction and recruitment juvenile period. Sampling was performed monthly at seven stations from July 2012 to June 2014, using a shrimp fishing boat. A total of 1650 specimens were collected: 551 males and 1099 females. The males were larger than females. Reproductive females were captured throughout the study period and juveniles were captured in most months. Both of these demographic categories were positively correlated with temperature. Growth parameters showed differences between sexes: CW∞ = 78.91 mm, k = 0.0066 day−1, t0 = 0.0965 for males and CW∞ = 69.71 mm, k = 0.0053 day−1, t0 = −0.2404 for females. Longevity was estimated at 1.91 and 2.40 years for males and females, respectively. The findings provide a greater understanding of the life cycle in this species. Additionally, since trawl nets are not selective, this study also provides information for better trawl fishery management, addressing not only the target shrimp but also the by-catch species.

First reference on reproductive biology of Butis koilomatodon in Mekong Delta, Vietnam

BMC Zoology ◽  
2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Quang M. Dinh ◽  
Tran T. H. Lam ◽  
Ton H. D. Nguyen ◽  
Thanh M. Nguyen ◽  
Tien T. K. Nguyen ◽  
...  
Keyword(s):  
Reproductive Strategies ◽  
Fishery Management ◽  
Gonadosomatic Index ◽  
Mekong Delta ◽  
Reproductive Traits ◽  
Biological Data ◽  
Reference Source ◽  
Future Studies ◽  
Different Types ◽  
Index Value

Abstract Background The key to fishery management is knowing the appropriate reproductive strategies of the targeted fish. For most gobiid species, the iteroparous pattern is dominant compared to semelparity. Albeit Butis koilomatodon plays an important role in the Mekong Delta’s food supply, its reproductive biological data have not been known. Hence, this study was conducted to provide new fundamental knowledge of reproductive traits of Butis koilomatodon in the Mekong Delta. Results A total of 1314 individuals (903 males and 411 females) were monthly collected by bottom gill nets from July 2019 to June 2020 at six sampling sites along estuarial and coastal regions, from Tra Vinh to Ca Mau provinces, southern of Vietnam. pH and salinity of these six sampling sites are 7.72–7.93 pH and 11.17–26.17‰, respectively. The pH varies with sites, but not seasons; whereas a reverse case is found in salinity. Different types of oocytes are found in histological specimens of ovaries prove that B. koilomatodon is a multi-spawner. The gonadosomatic index value, together with the monthly presence of mature ovaries reveal that this species spawns throughout the year. The length at first mature male Butis koilomatodon (5.1–8.6 cm) is higher than that of females (4.8–6.7 cm), except in Hoa Binh and Dong Hai. Batch fecundity (3085 to 32,087 eggs/female) increases with fish weight (1.48–12.30 g) and length (4.8–9.0 cm) due to high determination values (r2 > 0.6). Conclusion Knowledge of reproductive traits gained from this study was a reference source for future studies and helped manage this species’ resources.

scholarly journals Floral adaptation and diversification under pollen limitation

2010 ◽  
Vol 365 (1539) ◽  
pp. 529-543 ◽  
Author(s):  
Lawrence D. Harder ◽  
Marcelo A. Aizen
Keyword(s):  
Population Dynamics ◽  
Seed Production ◽  
Pollen Limitation ◽  
Resource Limitation ◽  
Reproductive Traits ◽  
Reproductive Characteristics ◽  
Pollen Vectors ◽  
Context Dependent ◽  
Female Success

Pollen limitation (PL) of seed production creates unique conditions for reproductive adaptation by angiosperms, in part because, unlike under ovule or resource limitation, floral interactions with pollen vectors can contribute to variation in female success. Although the ecological and conservation consequences of PL have received considerable attention in recent times, its evolutionary implications are poorly appreciated. To identify general influences of PL on reproductive adaptation compared with those under other seed-production limits and their implications for evolution in altered environments, we derive a model that incorporates pollination and post-pollination aspects of PL. Because PL always favours increased ovule fertilization, even when population dynamics are not seed limited, it should pervasively influence selection on reproductive traits. Significantly, under PL the intensity of inbreeding does not determine whether outcrossing or autonomous selfing can evolve, although it can affect which response is most likely. Because the causes of PL are multifaceted in both natural and anthropogenically altered environments, the possible outcrossing solutions are diverse and context dependent, which may contribute to the extensive variety of angiosperm reproductive characteristics. Finally, the increased adaptive options available under PL may be responsible for positive global associations between it and angiosperm diversity.

scholarly journals Population Dynamics and Reproduction of Mediterranean Green CrabCarcinus aestuariiin Parila Lagoon (Neretva Estuary, Adriatic Sea, Croatia) as Fishery Management Tools

2017 ◽  
Vol 9 (1) ◽  
pp. 260-270 ◽  
Author(s):  
Luka Glamuzina ◽  
Alexis Conides ◽  
Giorgio Mancinelli ◽  
Tatjana Dobroslavić ◽  
Vlasta Bartulović ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Fishery Management ◽  
Adriatic Sea ◽  
Management Tools

scholarly journals Modelling Caspian sturgeon population dynamics: a new paradigm and new technology

2006 ◽  
Vol 63 (6) ◽  
pp. 980-994 ◽  
Author(s):  
Robert A. Karayev
Keyword(s):  
Population Dynamics ◽  
Fishery Management ◽  
Cognitive Theory ◽  
New Technology ◽  
Traditional Theory ◽  
New Paradigm ◽  
New Approach ◽  
Knowledge Based ◽  
The Many ◽  
Analytical Tools

Abstract Currently, many problems beset sustainable management of Caspian sturgeon stocks, some outside the traditional theory of fishery management. Successfully solving such problems requires different models of population dynamics, reflecting the phenomenological properties of sturgeon stocks, the consequences of their overexploitation, and issues relating to environmental pressure on the ecosystem in which they live. Of the many analytical tools available to address the various questions, problem-orientated models are few. Their development demands a new approach, a new modelling paradigm, and new modelling tools that meet the modern ideas of ecosystem analysis and cognitive theory. This paper offers one such new paradigm and describes a knowledge-based modelling technique that may provide realization of this paradigm. A problem-orientated version of knowledge-based models is described, the applicability of such models in attempting to solve the practical issues of sturgeon fisheries management is reviewed, and an example of model implementation is given.

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