scholarly journals Population parameter Population parameters and bio-exploitation status of Indian Mackerel (Rastrelliger kanagurta Cuvier, 1816) in Mayalibit Bay, Raja Ampat, Indonesia

2019 ◽  
Vol 20 (12) ◽  
Author(s):  
Dian Oktaviani ◽  
Setiya Triharyuni ◽  
Duto Nugroho
Keyword(s):  
Significant Proportion ◽  
B Value ◽  
Small Scale ◽  
Population Parameter ◽  
Population Parameters ◽  
Indian Mackerel ◽  
Repeated Observation ◽  
Medium Risk ◽  
Rastrelliger Kanagurta ◽  
Exploitation Status

Abstract: Oktaviani D, Triharyuni S, Nugroho D. Population parameters and bio-exploitation status of Indian mackerel (Rastrelliger kanagurta Cuvier, 1816) in Mayalibit Bay, Raja Ampat, Indonesia. Biodiversitas 20: 3545-3552. A small-scale fishery in Mayalibit bay, Raja Ampat is one among rare fisheries systems existing in Indonesia. The area already designated as a conservation zone, and Indian mackerel is the main target species by fishers. This species plays a significant role in supplying domestic food. Fisher harvest with a small wooden boat, no engine, one-night fishing using Petro-lamp, and harvested with a scoop net. Monthly based biological observations on population parameters were carried out from March 2011 to April 2012. The result shows that the fish landed with size from 10.0 to 27.0 cm, and 70% of the sample is within 21-23 cm length. Monthly length-weight relationships indicate b value statistically equal to 3. The average unsexed Fulton condition factor index is 1.516 + 0.13 and illustrates the fishes were in suitable environmental conditions. The growth rate (K) is estimated at 0.97, while length infinity (L∞) is 28.4 cm. To evaluate the fishery, repeated observation of fishing in Mayalibit bay conducted in 2016. A productivity and susceptibility analysis was applied to predict its bio-exploitation status, and the results indicate that harvest levels are relatively at low-to-medium risk. Nevertheless, most of the fish caught in the bay by traditional knowledge consisted of mature cohorts while limited desk study to semi-industrial fishing targetted the same species in surrounding waters indicated that a significant proportion of undersize or immature individuals are in their landing. This phenomenon suggested that managing the existing local knowledge could significantly contribute to maintaining sustainable spawning stocks in the conservation zone.

scholarly journals POPULATION PARAMETER AND REPRODUCTIVE BIOLOGY OF INDIAN MACKEREL Rastrelliger kanagurta (Cuvier, 1817) CAUGHT BY LIFT NET IN KWANDANG WATERS, NORTH GORONTALO

2018 ◽  
Vol 23 (2) ◽  
pp. 107
Author(s):  
Ria Faizah ◽  
Lilis Sadiyah ◽  
Moh. Fauzi
Keyword(s):  
Reproductive Biology ◽  
Total Mortality ◽  
Mesh Size ◽  
Maturity Stage ◽  
Optimum Level ◽  
Population Parameter ◽  
Population Parameters ◽  
Indian Mackerel ◽  
Exploitation Rate ◽  
Rastrelliger Kanagurta

Kwandang waters is one of the main base for small pelagic fisheries in Sulawesi sea in which the Indian mackerel  (Rastrelliger kanagurta) has been exploited. The objective of the research was to estimate the population parameters, exploitation rate and reproductive biology of Indian mackerel. Length frequency data were collected from PP Kwandang, between February and October 2012. Estimation of population parameters of Indian mackerel was done using FISAT II method. The results showed that growth rate as follows (K) = 0,80 year-1 , L∞=27,3 cm.  Total mortality rate (Z) = 2,72 year-1, with natural mortality (M) = 1,29 year-1 and fishing mortality (F) = 1,43 year-1 and exploitation rate (E)=0,53. Exploitation of Indian mackerel in Kwandang waters have reached its optimum level. The sex ratio of Indian mackerel was balance. The most commonly found is Gonado Maturity Stage of I. Based on the results, it is necessary to manage with  the responsible management through gradually increasing of the mesh size of the gears or restricting additional lift net or  by restricting fishing for certain seasons or declaring fish sanctuaries in certain areas, especially in spawning grounds to protect the Indian mackerel.

scholarly journals Biological and population parameters of Tiger Shark Galeocerdo cuvier, landed in Tanjung Luar, West Nusa Tenggara

2020 ◽  
Vol 147 ◽  
pp. 02010 ◽  
Author(s):  
Irwan Jatmiko ◽  
Suciadi Catur Nugroho
Keyword(s):  
Total Mortality ◽  
Small Scale ◽  
Population Parameter ◽  
Tiger Shark ◽  
Population Parameters ◽  
Small Scale Fisheries ◽  
Galeocerdo Cuvier ◽  
Weight Relationship ◽  
Length Data ◽  
Length Frequency Analysis

Tiger shark is one of the important catch for small scale fisheries in West Nusa Tenggara. It is considered nearly threatened according the IUCN, thus information regarding to its estimated population is needed for conservative efforts. This study aimed to estimate the biological and population parameters of the tiger shark in Indonesia. Length data were collected from March to December 2018 in Tanjung Luar Port, West Nusa Tenggara. The length-weight relationship was calculated using equation W=aLb. Electronic length-frequency analysis (ELEFAN) in R Statistics with package “TropFishR” was used to estimate the population parameter. Length converted catch curve (LCCC) analysis was used to estimate the total mortality of the species. The results showed the length-weight relationship for combined sex, male and female was similar to the equation W=0.000001L3.15. The growth pattern for this species was positive allometric which means that the growth of weight is faster than its length. Total mortality was estimated at 0.33/yr, with natural and fishing mortality of 0.16/yr and 0.17/yr, respectively. The results from this study should be able to provide the basic information to support fisheries management of tiger sharks in Indonesia.

scholarly journals Stock assessment of the Indian mackerel Rastrelliger kanagurta (Cuvier, 1817) from Muscat coast, Oman

2016 ◽  
Vol 63 (4) ◽  
Author(s):  
N. Jayabalan ◽  
S. Zaki ◽  
A. Al-Marzouqi ◽  
F. Al-Kiyumi
Keyword(s):  
Stock Assessment ◽  
Total Mortality ◽  
B Value ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Indian Mackerel ◽  
A Value ◽  
Annual Total ◽  
Rastrelliger Kanagurta ◽  
Relationship Of

Assessment of age, growth and stock parameters was carried out for the Indian mackerel Rastrelliger kanagurta (Cuvier) along the Muscat coast of Oman between October 2007 and September 2009. The length-weight relationship of the fish indicated the ‘a’ value as 0.0101 and ‘b’ value as 3.0589. The length based von Bertalanffy growth (VBG) parameters L∞ K and t0 estimated were 37.54 cm, 1.0 y-1 and -0.17 y respectively. The estimates of mortality rates showed the annual total mortality (Z) to be 2.98, the natural mortality (M) 1.62 and fishing mortality (F) 1.36. The MSY estimated by Cadima’s estimator was 859 t and the predicted value by yield analysis stood at 1,273 t. The calculated exploitation rate (E) was 0.46. The Yw/R at F = 1.6 was 48 g. Estimates of higher MSY than the current yield, lower fishing mortality than natural mortality and lower E indicate scope for increase in yield of R. kanagurta from Muscat region.

Biomedical applications of fish gut associated Streptomyces maritimus IM20 isolated from Rastrelliger kanagurta (Indian mackerel)

2021 ◽  
Vol 16 (10) ◽  
pp. 120-130
Author(s):  
Angamuthu Vignesh ◽  
Venugopal Gopikrishnan ◽  
Sivaraj Anbarasu ◽  
Manikkam Radhakrishnan ◽  
Joseph Jerrine
Keyword(s):  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
Radical Scavenging ◽  
Bioactive Metabolites ◽  
Molecular Characteristics ◽  
Inhibition Assay ◽  
Indian Mackerel ◽  
Fish Gut ◽  
Rastrelliger Kanagurta

The biomedical potential of fish gut-associated actinobacteria isolated from the marine fish Rastrelliger kanagurta (Indian mackerel) was investigated. The actinobacterial strain IM20 was isolated from the fish gut by using Kusters agar medium prepared with 50% sea water. Based on their phenotypic and molecular characteristics, strain IM20 was identified as Streptomyces maritimus. The bioactive metabolites produced from the strain IM20 by agar surface fermentation and ethyl acetate extraction were tested for in vitro antimicrobial, antiquorum sensing , anti-biofilm, anti TB, anti-oxidant and anti-cancer activity. The MIC value of ethyl acetate extract (EAE) of IM20 was found to be 16 μg ml−1 against S. aureus and E. coli. In quorum sensing inhibition assay, the extract showed violacein inhibition upto 87% at 512 μg ml−1 concentration when tested by pigment inhibition assay using C. violaceum MTCC 2656. The results of in vitro assays revealed that the ethyl acetate extract of IM-20 (EAE-IM20) showed 75%, 83% and 72% inhibition against Mycobacterium tuberculosis H37Rv, M. tuberculosis (SHRE sensitive) and multi drug resistant (MDR) M tuberculosis respectively at 500 μg ml−1 concentration. In DPPH assay, 71% radical scavenging activity was exhibited by the EAE-IM20 at 250 μg ml−1. In MTT assay, EAEIM20 exhibited 74.29±2.01% inhibition on breast cancer cell line MCF7 (250 μg ml−1). This study broadly determines that the fish associated actinobacteria is a prolific place for diverse multifunctional bioactive compounds for the development of medically important unique drugs.

An Assessment of the Impact That Chemotherapy Treatment Has on Employment Status in Individuals with Lymphoma.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 5492-5492
Author(s):  
Jeff Horn ◽  
Ann T. Shaw
Keyword(s):  
Side Effects ◽  
Hodgkin’S Lymphoma ◽  
Significant Proportion ◽  
Hodgkin's Lymphoma ◽  
Small Scale ◽  
Main Theme ◽  
Chemotherapy Treatment ◽  
Working Age ◽  
The Impact

Abstract A significant proportion of individuals undergoing treatment for lymphoma are of working age and are in employment prior to diagnosis and during subsequent chemotherapy treatment. This small-scale study seeks to explore the impact that chemotherapy treatments have on employment. Specifically, the reasons for the decision to continue to work or not, and any perceived benefits or disadvantages encountered as a result are explored. Methods: All individuals presenting with newly diagnosed lymphoma, over a 12 month period, were identified retrospectively. Individuals of official working age, and who were receiving out-patient chemotherapy (i.e. who had the ability to be working at the time) were invited to participate. Participants were asked to complete a questionnaire that was designed to explore their experiences of employment during this time. Results: A total of 33 patients were invited to participate. A return rate of 70% was achieved. Of those who responded, 5 (22%) had already retired prior to diagnosis. A total of 12 patients (52%) continued to work during their chemotherapy treatment. Of these, 6 (50%) continued to work the same hours in the same conditions, whereas 6 (50%) worked an altered or flexible pattern. 6 patients (26%) stopped working for the duration of treatment, one of whom has not returned since. There were no obvious differences in patients with Hodgkin’s Lymphoma as opposed to Non-Hodgkin’s Lymphoma. The response rate was much higher in those who had received intravenous chemotherapy than oral preparations, preventing analysis of any potential variation in experiences. The qualitative data obtained gives a clearer insight into the many issues faced by the patient when undergoing chemotherapy treatment. Familiar themes were identified in many cases, and these were grouped into 5 main theme categories: Diversion from the reality of diagnosis and treatment Psychological Issues Issues of retained normality Practical Issues Physical or medical issues. Difficulty in coping with the side-effects of treatment, particularly fatigue, were commonly cited. Emotional effects such as stress and anxiety were also alluded to. Despite this, those who continued to work reported benefit from retaining a normal lifestyle, gained support from co-workers and experienced a diversion of focus from treatment. Several of those who continued to work cited financial reasons for this decision. Feedback suggested that advice given by the health-care team was often lacking or inconsistent. This did not reflect our perception of current practice, so it may suggest that it is the way that information is given that is ineffective. Conclusion: The majority of patients continued to work during their treatment and there appear to be many benefits to this. Difficulties encountered related mainly to treatment side-effects, logistical and practical problems associated with undergoing chemotherapy. It is envisaged that a greater understanding of the impact that lymphoma and its treatment has on employment may improve the level of support that can be offered by the multi-disciplinary team. The curative nature of many Lymphomas demands that long-term complications of the disease and treatment are fully addressed at the time of diagnosis. Social, economic and employment welfare are integral aspects to be considered, especially in a group of individuals who are likely to be long-term survivors.

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