scholarly journals Studi Struktur dan Pertumbuhan Populasi Kerang Pokea (Batissa violacea var. celebensis, von Martens 1897) di Sungai Pohara Sulawesi Tenggara

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
Bahtiar, Hamzah, M Dan Hari, H
Keyword(s):  
Population Structure ◽  
Von Bertalanffy ◽  
Structure Population ◽  
Activity Increase ◽  
Growth Coefficient ◽  
Male And Female ◽  
Growth Structure ◽  
Population Spread ◽  
Size Groups ◽  
Clam Population

AbstrakPokea merupakan bivalvia air tawar yang  hidup di segmen muara.  Bivalvia ini terus mengalami tekanan sejalan dengan peningkatan aktivitas kegiatan penangkapan dan  menurunnya kualitas perairan.  Penelitian ini bertujuan untuk mengetahui struktur dan pertumbuhan populasi kerang pokea di Sungai Pohara Sulawesi Tenggara.  Penelitian ini dilaksanakan di segmen muara Sungai Pohara selama setahun dari bulan Maret 2007-Februari 2008. Parameter populasi (L∞ dan K) dan to masing-masing dianalisis dengan menggunakan pergerakan modus frekuensi panjang dan nilai L0=0.025.  Pola pertumbuhan dianalisis menggunakan inverse von Bertalanffy sedangkan struktur populasi dianalisis menggunakan distribusi normal dari plot Bhattacharya yang secara keseluruhan terakomodasi pada program FiSAT II versi 3.0. Hasil penelitian menunjukkan bahwa lebar asimtotik dan koefisien pertumbuhan jantan dan betina masing-masing yaitu 7.16 cm, 0.59 dan 6.92 cm, 0.96. Oleh karenai tu, pertumbuhan pokea betina lebih cepat dibandingkan pokea jantan.  Populasi kerang pokea tersebar pada berbagai kelompok ukuran yang mewakili ukuran muda, dewasa dan tua dengan nilai tengah berada pada 1.49 dan 6.01 yang menyebar pada tiga kelompok ukuran.  Kelompok ukuran dominan pada jantan betina relatif berbeda yang tersebar pada nilai tengah masing-masing 1cm dan 2cm.  Secara umum, struktur populasi pokea di Sungai Pohara relatif stabil.Key word : pokea, pertumbuhan, struktur, populasi, sungai, PoharaAbstractPokea clam was fresh water bivalve that lived on well into estuary segments.  This bivalve have experienced in under pressure as activity increase in fishing events and decrease in water quality. This research aimed to understand the structure and growth population of pokea clam in Pohara river on Southeast Sulawesi. This research was conducted in estuary segment of Pohara river from March 2007 to February 2008. Parameters of population (L∞ dan K) and to were analyzed by using movements in modus of length frequency and Lo=0.025. Growth pattern was analyzed by using von Bertalanffy inverse, and population structure was analyzed by using normal distribution from Bhattacharya plot with full accommodation on FiSAT II version 3.0. The results of this research indicated that asymptotic width and growth coefficient for male and female were 7.16 cm, 0.59 cm, and 0.96 cm. Therefore, the growth of female pokea was faster than male. Pokea clam population spread to several size groups that represented as young, adult, and old with median 1.49 and 6.01. The dominant length measurement on male and female was relatively different which propagated in median 1 cm and 2 cm. Generally, population structure of pokea clam in Pohara river was relatively stable.Keyword: pokea, growth, structure, population, river, Pohara

scholarly journals Studi Struktur dan Pertumbuhan Populasi Kerang Pokea (Batissa violacea var. celebensis, von Martens 1897) di Sungai Pohara Sulawesi Tenggara

2018 ◽  
Vol 15 (2) ◽  
Author(s):  
Bahtiar, Hamzah, M Dan Hari, H
Keyword(s):  
Water Quality ◽  
Population Structure ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
Structure Population ◽  
Activity Increase ◽  
Growth Coefficient ◽  
Male And Female ◽  
Growth Structure ◽  
Size Groups

ABSTRAKPokea merupakan bivalvia air tawar yang hidup di segmen muara. Bivalvia ini terusmengalami tekanan sejalan dengan peningkatan aktivitas kegiatan penangkapan danmenurunnya kualitas perairan. Penelitian ini bertujuan untuk mengetahui struktur danpertumbuhan populasi kerang pokea di Sungai Pohara Sulawesi Tenggara. Penelitian inidilaksanakan di segmen muara Sungai Pohara selama setahun dari bulan Maret 2007-Februari2008. Parameter populasi (L∞ dan K) dan to masing-masing dianalisis dengan menggunakanpergerakan modus frekuensi panjang dan nilai L0=0.025. Pola pertumbuhan dianalisismenggunakan inverse von Bertalanffy sedangkan struktur populasi dianalisis menggunakandistribusi normal dari plot Bhattacharya yang secara keseluruhan terakomodasi pada programFiSAT II versi 3.0. Hasil penelitian menunjukkan bahwa lebar asimtotik dan koefisienpertumbuhan jantan dan betina masing-masing yaitu 7.16 cm, 0.59 dan 6.92 cm, 0.96. Olehkarenai tu, pertumbuhan pokea betina lebih cepat dibandingkan pokea jantan. Populasikerang pokea tersebar pada berbagai kelompok ukuran yang mewakili ukuran muda, dewasadan tua dengan nilai tengah berada pada 1.49 dan 6.01 yang menyebar pada tiga kelompokukuran. Kelompok ukuran dominan pada jantan betina relatif berbeda yang tersebar padanilai tengah masing-masing 1cm dan 2cm. Secara umum, struktur populasi pokea di SungaiPohara relatif stabil.Kata kunci : pokea, pertumbuhan, struktur, populasi, sungai, PoharaABSTRACTPokea clam was fresh water bivalve that lived on well into estuary segments. Thisbivalve have experienced in under pressure as activity increase in fishing events and decreasein water quality. This research aimed to understand the structure and growth population ofpokea clam in Pohara river on Southeast Sulawesi. This research was conducted in estuarysegment of Pohara river from March 2007 to February 2008. Parameters of population (L∞dan K) and to were analyzed by using movements in modus of length frequency andLo=0.025. Growth pattern was analyzed by using von Bertalanffy inverse, and populationstructure was analyzed by using normal distribution from Bhattacharya plot with fullaccommodation on FiSAT II version 3.0. The results of this research indicated thatasymptotic width and growth coefficient for male and female were 7.16 cm, 0.59 cm, and0.96 cm. Therefore, the growth of female pokea was faster than male. Pokea clam populationspread to several size groups that represented as young, adult, and old with median 1.49 and6.01. The dominant length measurement on male and female was relatively different whichpropagated in median 1 cm and 2 cm. Generally, population structure of pokea clam inPohara river was relatively stable.Keyword: pokea, growth, structure, population, river, Pohara

scholarly journals Population dynamics of mantis shrimp Harpiosquilla harpax and Oratosquillina sp. in the waters south of Madura Island, Indonesia

2020 ◽  
Vol 21 (4) ◽  
Author(s):  
Yenni Arista ◽  
ZAIRION ◽  
YUSLI WARDIATNO
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Life Span ◽  
Fishery Resource ◽  
Growth Coefficient ◽  
Mantis Shrimp ◽  
Exploitation Rate ◽  
L Value ◽  
Males And Females

Abstract. Ekalaturrahmah YAC, Zairon, Wardiatno Y. 2020. Population dynamics of mantis shrimp Harpiosquilla harpax and Oratosquillina sp. in the waters south of Madura Island, Indonesia. Biodiversitas 21: 1458-1466. Mantis shrimps are a potential fishery resource in Indonesia, but information about their population dynamics in the southern waters of Madura is limited. This study aimed to determine the population structure, growth, life span, and rate of exploitation for two taxa of mantis shrimp (Harpiosquilla harpax and Oratosquillina sp.). The research was conducted from September 2018 to February 2019 in the southern waters of Madura. The results showed that for H. harpax the majority of males caught ranged in length between 132.50 and 139.37 mm while the majority of females were between 153.45 and 160.22 mm. For Oratosquillina sp., the majority of males caught ranged from 84.70 and 89.60 mm while the majority of females were between 89.85 and 95.30 mm. The Growth Coefficient (K) for H. harpax was estimated to be 0.65 per year for males and 0.60 per year for females; while for Oratosquillina sp. the estimates were 0.81 and 0.78 per year, respectively. The L∞ value for H. harpax males was 183.00 mm and for females 250.55 mm, while the L∞ values for Oratosquillina sp. were 112.64 mm for males and 137.02 for females. The life span of H. harpax was estimated at 5 years, while for Oratosquillina sp. it was 4 years. The exploitation rate (E) for H. harpax males and females was 0.65 and 0.67 respectively, while for Oratosquillina sp. it was 0.54 and 0.58. These estimations indicated overexploitation of the resource, particularly in the case of H. harpax.

scholarly journals Effects of logging on Virola surinamensis in an Amazonian floodplain forest

2014 ◽  
Vol 15 (3) ◽  
pp. 1-8
Author(s):  
Leandro V. Ferreira ◽  
Denise A. Cunha ◽  
Pia Parolin
Keyword(s):  
Population Structure ◽  
Genetic Resources ◽  
Economic Value ◽  
Timber Species ◽  
Floodplain Forests ◽  
Male And Female ◽  
Conservation Program ◽  
Priority Species ◽  
New Policies ◽  
The Impact

Virola surinamensis is a dioecious timber species of Amazonian floodplain forests. It is threatened by extinction and a priority species in the conservation program of genetic resources with high economic value for Brazil. The present study was aimed to assess the population structure of Virola surinamensis and the impact of logging in the estuary region of Brazilian Amazonia. Our data suggest that altering the dioecious population structure by logging likely creates the imbalance of male and female individuals in the population. New policies are needed to protect Virola trees with a special regard on reproductive matriarch trees.

scholarly journals Population Structure and Some Growth Properties of Gibel Carp (Carassius gibelio) in a Mesotrophic Lake

2016 ◽  
Vol 8 (3) ◽  
pp. 286-291 ◽  
Author(s):  
Hakki DERELI ◽  
Ezgi DİNÇTÜRK
Keyword(s):  
Population Structure ◽  
Trophic Status ◽  
Gibel Carp ◽  
Trophic State Index ◽  
Von Bertalanffy ◽  
Total Length ◽  
Carassius Gibelio ◽  
Mesotrophic Lake ◽  
Growth Properties ◽  
Lake Beysehir

The hereby study investigated gibel carp (Carassius gibelio) in a mesotrophic lake (Lake Beyşehir, Turkey) from April 2013 to March 2014, in order to outline population structure and some growth properties of the species. Two water quality variables (Chlorophyll-a, Trophic State Index (TSI)) were detected seasonally to define trophic status of the lake. Length and weight distributions, length - weight relationship, sex ratio, gonadosomatic index (GSI), condition factor (CF) and von Bertalanffy equation were calculated for C. gibelio sampled monthly. Trophic status of the lake was defined as mesotrophic. Total length and weight of C. gibelio samples was determined in the range of 8.5 and 28.4 cm and 15 and 408 g, respectively. Mean total length and weight of individuals were calculated as 17.5 ± 2.37 cm and 88.6 ± 39.02 g, respectively. There was a negative allometry between length and weight for C. gibelio. The fish samples were composed of 52% females and 48% males, between II and VII years old. Spawning period of the species occurred between April and June after GSI values reached their maximum in March. The CF values were validated between 1.5-1.7 besides the mean rate of females and males were 1.6 and 1.5, respectively. The parameters of von Bertalanffy equation were calculated as L∞: 19.8 cm, W∞: 652.9 gr, k: 0.934. In conclusion, C. gibelio has almost lost the economic value since the individuals are smaller than market size (≥ 250 g), probably due to lack of nutrients/mesotrophic situation of Lake Beyşehir.

scholarly journals Simulation of optimum population structure (population dynamics)

1978 ◽  
Vol 10 (4) ◽  
pp. 599
Author(s):  
Maraia Aspers ◽  
Susanne Sylven ◽  
JA Eriksson ◽  
M Wilhelmson
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Structure Population ◽  
Optimum Population

Thyroxine levels in male and female white-tailed deer (Odocoileus virginianus)

1978 ◽  
Vol 56 (6) ◽  
pp. 945-949 ◽  
Author(s):  
G. A. Bubenik ◽  
A. B. Bubenik
Keyword(s):  
Population Structure ◽  
Odocoileus Virginianus ◽  
Wildlife Management ◽  
Mature Male ◽  
Male And Female ◽  
Annual Rhythm ◽  
Males And Females ◽  
Juvenile Males

Four major findings are described: (1) The episodic secretion of thyroxine in mature male white-tailed deer is most pronounced in the warmer months (June and September) and least demonstrated during the coldest months (November and January); (2) no clear annual rhythm of thyroxine was demonstrated in juvenile or mature male or mature barren female white-tailed deer. The monthly mean levels in mature males and females oscillate between 11 and 14 μg/100 ml throughout the year; (3) the seasonal levels of thyroxine in mature males are almost identical with the thyroxine levels of adult barren females; (4) the seasonal thyroxine levels of juvenile males are constantly higher than levels found in mature males. However, when these deer reach the age of 3 years, their thyroxine levels decrease to those of the adult.The collected data could serve as a tool of evaluation of population structure for wildlife management purposes.

Age structure and growth in a population of Pelobates varaldii (Anura, Pelobatidae) from northwestern Morocco

2011 ◽  
Vol 32 (4) ◽  
pp. 550-556 ◽  
Author(s):  
Marcello Mezzasalma ◽  
Fabio Maria Guarino ◽  
Angelica Crottini ◽  
Franco Andreone ◽  
Philip de Pous
Keyword(s):  
Body Mass ◽  
Age Structure ◽  
Growth Rates ◽  
Growth Curves ◽  
Von Bertalanffy ◽  
Growth Coefficient ◽  
Similar Profile ◽  
Spadefoot Toad ◽  
The Difference ◽  
First Time

AbstractAge structure and growth in the Moroccan spadefoot toad, Pelobates varaldii were estimated by skeletochronology and reported for the first time for a population living in NW Morocco. Snout vent length and body mass did not significantly differ between the sexes, although females appeared larger and heavier than males. Age ranged 2-7 years in males (mean age±SD: 4.5±1.2, n = 66) and 2-10 years in females (4.7±2.4, n = 20). The difference in age was not significant between the sexes. The modal age was 5 years for males and 3 years for females. The age distributions significantly differed between the sexes. Von Bertalanffy growth curves showed a similar profile between the sexes although growth coefficient was higher in males than in females. Longevity and growth rates of P. varaldii were compared with those of other species of the genus Pelobates.

scholarly journals Analysis Model of Giant Prawns Population (Macrobrachium rosenbergii) in Estuary Edge of Sembakung Waters, Nunukan, Indonesia

2020 ◽  
Vol 12 (2) ◽  
pp. 236
Author(s):  
Agus Indarjo ◽  
Gazali Salim ◽  
Christine Dyta Nugraeni ◽  
Lukman Yudho Prakoso ◽  
Permana Ari Soejarwo ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Growth Pattern ◽  
Growth Characteristic ◽  
Macrobrachium Rosenbergii ◽  
Survey Method ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Male Mortality ◽  
Male And Female ◽  
Exploitation Rate

HighlightThe sex ratio of giant prawns in the waters of fe- male groceries is 3 times higher than that of males.The growth characteristic of male and female   giant   prawns   is   negative   allometry, but the male and female body shapes are fat.Total   mortality, capture mortality, catch rate, male prawns are higher than females.The male infinitive growth is longer than the female,but the female’s growth rate is faster than male.AbstractGiant prawns (Macrobrachium rosenbergii) is a crustacean class that has the larg- est size and its habitat in Sembakung waters included brackish water (estuarine) with a salinity variable of 6.5+0.5 ppt and a temperature variable of 28.5+0.5OC and a variable pH of 6 (acidic). The objective of this research was to analyze the growth and mortality model of giant prawns (M. rosenbergii) that was taken from the catch of fisherman in the estuary, Sembakung sub-district, Nunukan Regency, Indonesia. The study was conducted for 3 months from November 2019 to Janu- ary 2020. The sampling was by using a survey method with purposive judgment sampling based on a catch of 14 fishermen who used the bottom fish pot from Sembakung waters, Nunukan Regency (Indonesia). The data collection included data of sex, total length, and the total weight of giant prawns. While analysis was employed for growth pattern, condition index, Von Bertalanffy growth, and mor- tality. The results obtain the sex ratio of male and female giant prawns 1:3.67. The growth pattern of male and female giant prawns were allometric negative. The growth of the von Bertalanffy model for infinitive growth of male giant prawns were 21.219 cm and female were 18.42 cm, respectively the mortality from giant prawns obtain total male mortality is 2,257, catch mortality is 1.92 and natural mortality is 33.75% with an exploitation rate of 0.85 (85%). The total female mor- tality is 1.528, catch mortality is 120.1% and natural mortality is 32.69% with an exploitation rate of 0.786 (78.6%).

Age and growth studies of Gummy Shark, Mustelus antarcticus Gunther, and School Shark, Galeorhinus galeus (Linnaeus), from Souther Australian Waters

1992 ◽  
Vol 43 (5) ◽  
pp. 1241 ◽  
Author(s):  
PL Moulton ◽  
TI Walker ◽  
SR Saddlier
Keyword(s):  
South Australia ◽  
Growth Curves ◽  
Growth Patterns ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
Male And Female ◽  
Length Data ◽  
Von Bertalanffy Growth Equation ◽  
Galeorhinus Galeus

Age-length data were derived from counting stained bands on whole vertebral centra obtained from gummy shark, Mustelus antarcticus, captured by gill-nets during 1973-76 in Bass Strait and from gummy shark and school shark, Galeorhinus galeus, captured during 1986-87 in Bass Strait and waters off South Australia. The data were fitted to the von Bertalanffy growth equation after adopting the Francis reparametrization and correcting for sampling bias caused by the selectivity effects of the gill-nets of various mesh sizes used to capture the sharks. The von Bertalanffy growth curves of male and female gummy shark were significantly different, but the growth curves of male and female school shark were not. The growth curves suggest that growth rates of male and female gummy shark in Bass Strait were lower during 1986-87 than during 1973-76 and that the growth rates of male and female gummy shark and school shark in Bass Strait during 1986-87 were lower than those in South Australia at the same time. These apparent temporal and spatial differences in growth patterns of gummy shark are explained by the 'Phenomenon of Apparent Change in Growth Rate'. It is concluded that the growth curves determined for 1986-87 are distorted by the effects of a long history of high and length-selective fishing mortality and that actual growth patterns of gummy shark are better represented by the von Bertalanffy growth equation determined for shark caught in Bass Strait during 1973-76, when fishing mortality was much lower. Verification of age estimates was attempted by comparing von Bertalanffy growth curves derived from age-length data with those derived from tag release-recapture length-increment data, but these comparisons highlight the limitations of using tag data for this purpose. Although reasonable agreement was found between such growth curves for gummy shark, it appears that school shark older than 11 years cannot be aged accurately from stained whole or sectioned vertebrae. Sectioned vertebrae from a school shark recaptured 35.7 years after being tagged and released and calculated as having an age exceeding 45 years gave estimates of only 18-20 years of age.

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