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| Registros recuperados: 13 | |
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| Giménez, E.. |
| The red grouper fishery is in its decline phase presenting an average annual catch of 8191 t during the 1999 to 2003 period. Through these years Cuban fleet has reduced its fishing area toward the oriental region of the Campeche Bank while the artisanal fleet extended, increasing the overlap of sizes catched by the arisanal-industrial and artisanal-cuban fleets. The size composition of the catch shows that most of the fishes are captured before first maturation size. First catch age is 2 years, and complete fishery recruitment is at age 3 (age of first maturation), this being a factor against fishing sustainability and forcing adoption of management strategies. The natural mortality is calculated (M) for the each age in the fishery by the function Y =... |
| Tipo: Theses and Dissertations |
Palavras-chave: Management; Natural mortality; Management; Http://aims.fao.org/aos/agrovoc/c_16086. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1438 |
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| Bowlby, Heather D.; Benoît, Hugues P.; Joyce, Warren; Sulikowski, James; Coelho, Rui; Domingo, Andrés; Cortés, Enric; Hazin, Fabio; Macias, David; Biais, Gerard; Santos, Catarina; Anderson, Brooke. |
| Accurately characterizing the biology of a pelagic shark species is critical when assessing its status and resilience to fishing pressure. Natural mortality (M) is well known to be a key parameter determining productivity and resilience, but also one for which estimates are most uncertain. While M can be inferred from life history, validated direct estimates are extremely rare for sharks. Porbeagle (Lamna nasus) and shortfin mako (Isurus oxyrinchus) are presently overfished in the North Atlantic, but there are no directed fisheries and successful live release of bycatch is believed to have increased. Understanding M, post-release mortality (PRM), and variables that affect mortality are necessary for management and effective bycatch mitigation. From 177... |
| Tipo: Text |
Palavras-chave: Natural mortality; Recovery period; Lamnid sharks; Atlantic; Survival; Mitigation; Bycatch. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00688/80020/83005.pdf |
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| Gabr, H.R.; Riad, R.. |
| Specimens from common octopus, Octopus vulgaris captured from the Red Sea and Mediterranean Sea showed significant differences in four of seven morphometric measurements .These differences are sufficient to recognize the populations of this species in the two habitats. The computed length-Wight relationship and condition factor for common octopus in both areas showed that representatives of this species from the Red Sea are heavier than those captured from the Mediterranean Sea for the same length group. Moreover, the natural mortality coefficient of Mediterranean representatives was comparatively higher than for the Red Sea octopus. This shows that the environmental conditions in the Red Sea are more suitable for O. vulgaris than in the Mediterranean Sea. |
| Tipo: Journal Contribution |
Palavras-chave: Field Study; Natural mortality; Octopus fisheries. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/2207 |
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| Riad, R.; Gabr, H.R.. |
| Specimens from common octopus, Octopus vulgaris captured from the Red Sea and Mediterranean Sea showed significant differences in four of seven morphometric measurements .These differences are sufficient to recognize the populations of this species in the two habitats. The computed length-Wight relationship and condition factor for common octopus in both areas showed that representatives of this species from the Red Sea are heavier than those captured from the Mediterranean Sea for the same length group. Moreover, the natural mortality coefficient of Mediterranean representatives was comparatively higher than for the Red Sea octopus. This shows that the environmental conditions in the Red Sea are more suitable for O. vulgaris than in the Mediterranean Sea. |
| Tipo: Journal Contribution |
Palavras-chave: Field Study; Natural mortality; Octopus fisheries. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/2207 |
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| Pájaro, M.. |
| Cannibalism is not an abnormal behaviour and it can be observed in a wide number of animals. In Pisces, cannibalism may be the result of endogenous intraspecific factors (nutritional state, size, age, state of development) or exogenous intraspecific factors (food, density, light). Nevertheless, external fertilization and the high fecundity of teleost fish tend to increase egg cannibalism, in particular among filter feeding fishes such as anchovies. In the present work, two important Argentine anchovy Engraulis anchoita stocks were studied. The first is to the north of 41°S, and spawns during spring on the coastal and shelf waters of Buenos Aires Province,Argentina, and Uruguay. The second one inhabits the Patagonian region, from 41°S to 47°S. It spawns... |
| Tipo: Theses and Dissertations |
Palavras-chave: Feeding behaviour; Cannibalism; Natural mortality; Fish larvae; Fish eggs; Spawning seasons; Stocks; Food preferences; Reproduction; Stocks; Food preferences; Feeding behaviour; Cannibalism; Fish larvae; Reproduction; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_3024; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_9580; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_6507. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1476 |
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| Zavatteri, A.; Abachian, V.E.; Giussi, A.R.; Di Leva, I.V.. |
| Estimate of age, growth and natural mortality of longtail hake (Macruronus magellanicus) in the Southwest Atlantic Ocean during summer 2010. Longtail hake (Macurornus magellanicus) total length (TL) and weight (W) growth parameters were estimated and age structure and natural instantaneous mortality coefficient (M) analyzed. Data were obtained within the framework of the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) “Observers on Board of Commercial Vessels” Subprogramme. The information, derived from the area comprised between 46° S-54° S, was collected during the February-April 2010 period. Sagittae otoliths reading of 5,034 individuals (2,429 males and 2,605 females) between 28-99 cm TL was performed. The maximum ages observed in... |
| Tipo: Journal Contribution |
Palavras-chave: Age determination; Growth; Natural mortality. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5504 |
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| Hernández, D.R.; Perrotta, R.G.. |
| Pope's Cohorts Analysis was modified to extend its application to a wider range of natural mortality, M and fishing mortality, F rate values. The modified method maintains the simplicity of the one established by Pope and does not require to resolve any non lineal equation in each cohort reconstruction process. The relative errors obtained when estimating the number of individuals per age (maximum and mean in absolute value) showed acceptable levels within the five domains (M and F pairs of values) analyzed in this work. The new method can be adapted to a particular situation (M and F values range) simply solving an optimization problem (minimization of the maximum relative error absolute value) easily achieved using a calculation sheet or considering the... |
| Tipo: Journal Contribution |
Palavras-chave: Fishing mortality; Natural mortality; Stock assessment; Stock assessment; Http://aims.fao.org/aos/agrovoc/c_24251. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3143 |
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| Hansen, J.E.. |
| The aim of this paper was to accurately estimate population parameters of northern (“bonaerensis”, latitude < 41° S) and southern (“patagonic”, latitude 41° S) Argentine anchovy stocks and to describe some aspects of their behaviour. The research surveys allowed to obtain data on length, total weight, sex, maturity and age of 27,853 specimens of the northern and 12,787 of the southern stocks. Besides, 20,717 age determinations stemmed from commercial landing samplings of the northern stock were established. Sex proportion in the northern population was 0.50 : 0.50; the southern showed a slight predominance of males (0.52 : 0.48). Data derived from cruises and commercial landings showed statistical differences in the growth ratio of the northern stock... |
| Tipo: Journal Contribution |
Palavras-chave: Pelagic fisheries; Stocks; Population characteristics; Growth; Natural mortality; Sexual maturity; Engraulis anchoita; Marine environment. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4884 |
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| de León González, María Estela. |
| ABSTRACT Temporal variability in the population parameters of the Caribbean spiny lobster Panulirus argus (Latreille, 1804) in Cuban waters Modifications in life-history traits are often concomitant with prolonged periods of exploitation or changes in the environment, producing changes in population abundance. . Both of them act as selective forces and could affect population parameters behaviour like growth rate, reproduction output, natural mortality rate and size at first maturity. Because of the economic importance of Caribbean spiny lobster (Panulirus argus) for Cuba and other countries of western central Atlantic, it is necessary to make a careful study in its life cycle processes and changes happened in temporal scale. Data used were obtained from... |
| Tipo: Theses and Dissertations |
Palavras-chave: Growth; Natural mortality; Lobster culture; Growth; Http://aims.fao.org/aos/agrovoc/c_3394. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1564 |
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| Registros recuperados: 13 | |
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