Role of Cortisol and its Effect on Male freshwater fish Notopterus notopterus (Pallas) during four Reproductive phases

Author(s):  
Shankar D.S. ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 101-114
Author(s):  
Jacinta Tangil ◽  
◽  
Asmiaty Amat

This study discusses the practice of the bombon system which is a tradition of the Kadazandusun community. The bombon system is a method of conservation of freshwater fish that has been practiced by the Kadazandusun since the time of their ancestors. Through this practice, the Kadazandusun community can preserve their environment, while at the same time ensuring a continuous source of fish. The bombon tradition is based on the traditional beliefs and customary laws of the Kadazandusun people. The bombon system shows the local wisdom of the Kadazandusun community towards the environment and in human relations. The problem around which this study is centred relates to the structural functionalism of the bombon system in the life of the Kadazandusun community. The objective of this study is to look at the function and role of the practice of the bombon system in the life of the Kadazandusun community. This study was conducted via field study, employing interviews, participatory observations and document research. The results show that the bombon system and the Kadazandusun community are functional and support each other’s survival. The practice of the bombon system becomes a functional aesthetic requirement for the community of bombon practitioners, furthering its role as a contributor to the values and culture of the practitioner community. The practice of the bombon system, which highlights many implicit and explicit positive effects in the life of the Kadazandusun community, proves that the practice is functional and continues to be relevant to the life of the community today.


2019 ◽  
Vol 9 (5) ◽  
pp. 2833-2846 ◽  
Author(s):  
Allan Raffard ◽  
Julien Cucherousset ◽  
Jérôme G. Prunier ◽  
Géraldine Loot ◽  
Frédéric Santoul ◽  
...  

Fishes ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 49
Author(s):  
Jose W. Valdez ◽  
Kapil Mandrekar

Freshwater fish represent half of all fish species and are the most threatened vertebrate group. Given their considerable passion and knowledge, aquarium hobbyists can play a vital role in their conservation. CARES is made up of many organizations, whose purpose is to encourage aquarium hobbyists to devote tank space to the most endangered and overlooked freshwater fish to ensure their survival. We found the CARES priority list contains nearly six hundred species from twenty families and two dozen extinct-in-the-wild species. The major families were typically those with the largest hobbyist affiliations such as killifish, livebearers, and cichlids, the latter containing half of CARES species. CARES included every IUCN threatened species of Pseudomugilidae and Valenciidae, but only one percent of threatened Characidae, Cobitidae, and Gobiidae species. No Loricariidae in CARES were in the IUCN red list as they have not been scientifically described. Tanzania and Mexico contained the largest amount of species, with the latter containing the most endemics. Many species were classified differently than the IUCN, including a third of extinct-in-the-wild species classified as least concern by the IUCN. This vast disconnect exemplifies the importance of future collaboration and information exchange required between hobbyists, the scientific community, and conservation organizations.


1994 ◽  
Vol 45 (5) ◽  
pp. 905 ◽  
Author(s):  
PC Gehrke ◽  
JH Harris

Potential pathways for interaction between fish and cyanobacteria include fish grazing directly on cyanobacteria, fish preying on grazers of cyanobacteria, fish supplying nutrients through excretion, fish providing nutrients by resuspending sediments, and fish altering the availability of nutrients and light by damaging macrophytes. The dominant interactions in Australia are likely to be through pathways that increase the availability of nutrients at the bottom of the food web. Carp probably contribute to these pathways more than do other species by excreting nutrients, resuspending sediments and damaging macrophytes. Further research, on both alien and native fish species, is needed to quantify these processes. Grazing of cyanobacteria by fish is probably trivial because freshwater fish in Australia lack mechanisms to process cyanobacterial cells effectively. Trophic interactions between planktivorous fish, zooplankton and cyanobacteria require closer study to assess the potential for preventing cyanobacterial blooms by manipulating natural predator communities in Australia. However, the need to protect and strengthen native fish stocks precludes removal of native fish to reduce predation pressure on zooplankton communities. Alternative solutions that combine control of nutrients entering waterways and removal of carp have a higher likelihood of success.


1994 ◽  
Vol 68 (4) ◽  
pp. 315-318 ◽  
Author(s):  
R.S. Kirk ◽  
J.W. Lewis

AbstractThe distribution and host range of Sanguinicola armata, S. inermis and S. volgensis in British freshwater fish are described. S. inermis has been recorded in carp Cyprinus carpio, crucian carp Carassius carassius and tench Tinca tinca in southern, central and eastern England and in koi carp imported from Japan. S. armata has been detected in pike Esox lucius and tench and S. volgensis has been found in chub Leuciscus cephalus, dace Leuciscus leuciscus, perch Perca fluviatilis, roach Rutilus rutilus and pike in southern and eastern England. The first record of the co-occurrence of two species of Sanguinicola (S. inermis and S. volgensis) in a British inland water is reported. The importance of blood flukes and the role of anthropochore movement of fish hosts in dissemination of S. inermis are discussed.


1956 ◽  
Vol 13 (3) ◽  
pp. 327-342 ◽  
Author(s):  
P. A. Larkin

Interspecific competition is defined as the demand of more than one organism for the same resource of the environment in excess of immediate supply. When two species are "competing for a niche" the term competition has been used to include phenomena such as predation of the two species on each other, competition to avoid a parasite, etc. Making this distinction in natural situations is unrealistic. In the limited sense in which interspecific competition is defined above, it is a discrete phenomenon, which with other phenomena such as predation, can be measured as a factor involved in interaction between species.Freshwater environments offer comparatively few opportunities for specialization in fishes. In consequence many species have a relatively wide tolerance of habitat type, a flexibility of feeding habits and in general share many resources of their environment with several other species of fish. Cannibalism and mutual predation are common complications of competitive relationships between species. The organization of freshwater fish communities is thus characterized by breadth at each level of the food chain rather than by a height of a pyramid of numbers. Flexible growth rate and high reproductive potential permit fish populations to tide over unfavorable periods of competition. In these circumstances it is difficult to separate the role of interspecific competition from other phenomena as a factor of population control. As a subordinate factor, predisposing fish to loss from other causes, interspecific competition may act to influence population levels. There is need for quantitative data and mathematical models for study of the types of population interaction typical in freshwater fish associations.


2021 ◽  
Vol 11 (1) ◽  
pp. 3291-3304

In recent decades, various procedures have been introduced to improve the conditions of the cultural ponds' conditions in aquaculture. Numerous biological products, including live bacterial inocula, preparation of enzymes, extracts of plant products, and many others, are being promoted to induce water and soil quality conditioners in aquaculture ponds. However, several studies have shown no significant effect of bacterial inoculums, and also the treatment with enzymatic preparation led to an enhancement of microbial mineralization of organic matter, but no effective net production of fish was observed. Probiotics have recently been applied to aquaculture. Probiotics are the live cells or a substrate that induce its benefits by stimulating growth, digestion, and active immune response. Probiotics can also improve water and soil quality. The current study summarizes the role of commercial probiotic ‘Super-PS’ on water quality and soil quality maintenance during the culture of freshwater fish Pangasius hypophthalmus fingerlings.


2015 ◽  
Vol 40 ◽  
pp. 19-23 ◽  
Author(s):  
R.S. Kulkarni

Hematological and some biochemical contents of the blood in relation to physico-chemical characteristics of the water have been studied in the fresh water fish, Notopterus notopterus. The results indicated that normal values have been found in comparison to the studies carried out in other fishes. Hence, the fish Notopterus notopterus is having favorable environmental temperature, pH and dissolved oxygen required for the fish to survive and regulate breeding activities.


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