Growth rates of barramundi, Lates calcarifer (Bloch), in Papua new Guinea

1982 ◽  
Vol 33 (4) ◽  
pp. 663 ◽  
Author(s):  
LF Reynolds ◽  
R Moore
Keyword(s):  
Papua New Guinea ◽  
Growth Rates ◽  
New Guinea ◽  
Fish Growth ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
Lates Calcarifer ◽  
Weight Relationship

Growth rates of L. calcarifer in western Papua were determined using modal progression in length- frequency samples and analysis of increases in lengths of tagged fish. Growth was rapid, the Von Bertalanffy parameters being K = 0.128, L∞ = 138 cm and t0 = -1.12 years. The length-weight relationship was W = 0.0106l3.02, where W is weight measured in grams and I is length measured in centimetres.

Mercury in Marine and Freshwater Fish of Papua New Guinea

1979 ◽  
Vol 30 (5) ◽  
pp. 617 ◽  
Author(s):  
C Sorentino
Keyword(s):  
Papua New Guinea ◽  
Total Mercury ◽  
River System ◽  
New Guinea ◽  
Mercury Content ◽  
World Health ◽  
Lates Calcarifer ◽  
The World ◽  
Health Organization ◽  
Fly River

A survey was carried out of the mercury content of 19 fish species from 18 locations In the coastal and fresh waters of Papua New Guinea. Most commercial catches had total mercury contents well below the 0.5 �g/g limit recommended by the World Health Organization, the only exception being barramundi (Lates calcarifer) caught in the Fly River system. The presence of mercury in this river is discussed.

Response of barramundi, Lates calcarifer, populations in the Fly River, Papua New Guinea to mining, fishing and climate-related perturbation

2005 ◽  
Vol 56 (7) ◽  
pp. 969 ◽  
Author(s):  
David Milton ◽  
Markson Yarrao ◽  
Gary Fry ◽  
Charles Tenakanai
Keyword(s):  
Papua New Guinea ◽  
Negative Impact ◽  
New Guinea ◽  
Commercial Fishery ◽  
Artisanal Fishery ◽  
Lates Calcarifer ◽  
Gill Nets ◽  
Breeding Grounds ◽  
Catch Rates ◽  
Fly River

Migrating barramundi (Perciformes : Centropomidae) spawners support a valuable artisanal fishery on the coast of south-western Papua New Guinea. This fishery declined dramatically during the 1990s shortly after the large Ok Tedi copper mine began in the headwaters of the large Fly River nearby. In order to understand the factors causing the decline, populations were sampled quarterly with gill-nets at over 20 sites throughout the Fly River from 1987 to 2001. Barramundi were most abundant in the middle and upper reaches of the Fly River. No evidence was found that output from the large Ok Tedi mine was negatively impacting on barramundi catch rates. However, the commercial fishery in the middle Fly River was found to have a negative impact on the weight of barramundi in monitoring catches in that region. Additionally, catch rates of juvenile barramundi (1 year olds) in the Fly River were negatively correlated with the amount of rainfall on the breeding grounds during the previous monsoon. This suggests that the reduced catch rates in the coastal commercial fishery in the late 1980s and early 1990s may have been affected by both the riverine commercial fishery and the El Niño (ENSO) that occurred at that time.

scholarly journals Short Communication: Age and growth of elongated mudskipper, Pseudapocryptes elongatus (Cuvier, 1816) from Sundarbans, India

2018 ◽  
Vol 20 (1) ◽  
pp. 85-90 ◽  
Author(s):  
GOPALAN MAHADEVAN ◽  
PALANIVEL BHARATHIRAJAN ◽  
VELAYUTHAM RAVI ◽  
MOJTABA POULADI ◽  
MARYAM MIRZAEI VAND KHANGHAH
Keyword(s):  
Short Communication ◽  
Growth Parameters ◽  
Mathematical Expression ◽  
Fish Growth ◽  
Age And Growth ◽  
Von Bertalanffy ◽  
Frequency Data ◽  
Length Frequency ◽  
Males And Females ◽  
Length Frequency Data

Mahadevan G, Bharathirajan P, Ravi V, Pouladi M, Mirzaei Vand Khanghah M. 2019. Short Communication: Age and growth of elongated mudskipper, Pseudapocryptes elongatus (Cuvier, 1816) from Sundarbans, India. Biodiversitas 20: 85-90. The estimation of age and mathematical expression of fish growth is complex and debated subject in fishery sciences. Growth parameters of elongated mudskipper, Pseudapocryptes elongatus were estimated based on the length frequency data using FiSAT II software (several tools such as Powell-Wetherall method, ELEFAN and von Bertalanffy growth estimates). Samples were collected from Sundarbans mangroves using gill and cast nets and by hand picking. The length-frequency (LFQ) of P.elongatus was recorded from January 2014 to December 2015 and the above tools estimated the growth parameters (L∞, K and t0) from the progression of LFQ modes through time. L∞ and K values of males were 220.50 mm and 1.3 yr-1, respectively and similarly, L∞ and K values of females were 221.05 mm and 1.21 yr-1, respectively. The t0 values estimated for males and females were-0.1915 years and-0.1661 years, respectively. The estimated growth performance index (Φ) values for males and females of P. elongatus were 4.394 and 4.503, respectively. The lifespan of both the sexes was found to be 4+ years.

Are Growth Parameters Estimated from Tagging and Age–Length Data Comparable?

1988 ◽  
Vol 45 (6) ◽  
pp. 936-942 ◽  
Author(s):  
R. I. C. C. Francis
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Growth Parameters ◽  
Growth Models ◽  
Maximum Length ◽  
Fish Growth ◽  
Data Sets ◽  
Von Bertalanffy ◽  
Length Data ◽  
The Mean

The two most common ways of estimating fish growth use age–length data and tagging data. It is shown that growth parameters estimated from these two types of data have different meanings and thus are not directly comparable. In particular, the von Bertalanffy parameter l∞ means asymptotic mean length at age for age–length data, and maximum length for tagging data, when estimated by conventional methods. New parameterizations are given for the von Bertalanffy equation which avoid this ambiguity and better represent the growth information in the two types of data. The comparison between growth estimates from these data sets is shown to be equivalent to comparing the mean growth rate of fish of a given age with that of fish of length equal to the mean length at that age. How much these growth rates may differ in real populations remains unresolved: estimates for two species of fish produced markedly different results, neither of which could be reproduced using growth models. Existing growth models are shown to be inadequate to answer this question.

An integrated model for growth incorporating tag–recapture, length–frequency, and direct aging data

2004 ◽  
Vol 61 (2) ◽  
pp. 292-306 ◽  
Author(s):  
J Paige Eveson ◽  
Geoff M Laslett ◽  
Tom Polacheck
Keyword(s):  
Growth Curve ◽  
Bluefin Tuna ◽  
Fish Growth ◽  
Data Sources ◽  
Smooth Transition ◽  
Likelihood Method ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
Direct Aging ◽  
Southern Bluefin Tuna

A maximum likelihood method for modelling fish growth is presented that integrates data from three key sources of growth information: tag–recapture studies, length–frequency samples from commercial catches, and direct aging data from hard-parts analyses. Previous studies have almost exclusively modelled growth using only one of these sources of information. Different data sources are often most informative about different portions of the life cycle. The development of an integrated approach allows for the different data sources to complement each other and provide more comprehensive and robust estimates of growth parameters. The integrated method is applied to data sets from southern bluefin tuna (Thunnus maccoyii) using the von Bertalanffy growth curve as well as a more sophisticated growth curve that makes a smooth transition between two von Bertalanffy curves with different growth rate parameters. The latter is found to provide a significantly better fit and supports previous findings that southern bluefin tuna experience a transition in growth during the juvenile stage of life. Many species exhibit a seasonal growth pattern, including southern bluefin tuna for which growth is fastest during the austral summer. A method for incorporating an annual seasonal component into the analysis is described and applied.

scholarly journals Length weight relationship, growth parameter, and condition factor of caroun croaker Johnius carouna (Cuvier, 1830) in the Southern waters of Java

2019 ◽  
Vol 19 (2) ◽  
pp. 231 ◽  
Author(s):  
Ria Faizah ◽  
Regi Fiji Anggawangsa
Keyword(s):  
Condition Factor ◽  
Growth Parameter ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
The South ◽  
Growth Coefficient ◽  
Weight Relationship ◽  
Central Java ◽  
Von Bertalanffy Growth Equation

Caroun croaker (Johnius carouna) is one of demersal fishes which are commonly caught in the south of Java waters. This fish captured by trammel net, gillnet, danish seine and mini trawl. This study aims to determine length and weight relationship, growth parameter, length frequency distribution and condition factors of croaker fish caught in the south of Java waters.   This study was conducted from January-December 2015 at the Cilacap Ocean Fisheries Port, Central Java. Data collected was total length (TL in mm) and weight (W in g) of caroun croacker fish.  A total of 2141 of Caroun croaker was caught by mini trawl during the sampling periods. The result showed that the size of croaker fish caught by mini trawl ranged between 85-225 mm with an average was 143.7 mm. Length and weight relationship expressed by equation of W = 0.0062 TL3.2889 ( R2 = 0.9443). The growth pattern of croaker fish was allometric positive. The Von Bertalanffy growth equation of caroun croacker fish in south of Java waters was Lt =155 (1 - e -0.9(t+0.2127)) with the asymptotic length (L∞) =155  mm, growth coefficient (K) = 0.9 per year and the theoretical age croaker fish that was equal to (t0) = - 0,2127.

Age, growth and maturity of a New Zealand endemic shark (Mustelus lenticulatus) estimated from vertebral bands

2000 ◽  
Vol 51 (1) ◽  
pp. 35 ◽  
Author(s):  
Malcolm P. Francis ◽  
Caoimhghin Ó Maolagáin
Keyword(s):  
Growth Rates ◽  
East Coast ◽  
Growth Curves ◽  
Von Bertalanffy ◽  
Frequency Data ◽  
Length Frequency ◽  
Significant Difference ◽  
Growth Bands ◽  
Males And Females ◽  
Length Frequency Data

Rig (Mustelus lenticulatus) specimens were aged by counting growth bands in whole vertebrae that were illuminated laterally with fibre-optic lights. Bands were counted by two readers who used information on the diameter of the vertebrae of new-born young and 1-year-old juveniles to identify the inner bands. The greatest estimated age was 12.1 years for a female of 137 cm total length, but few rig were more than 8 years old. For west coast South Island (WCSI) rig, there was no significant difference in growth rates of males and females. After pooling both sexes, there was no significant difference in growth rates between WCSI and east coast South Island (ECSI) rig. The combined WCSI and ECSI von Bertalanffy growth curve was Lt = 147.2 (1 – e −0.119[t + 2.35]). This curve agreed well with growth curves derived from length–frequency data, but validation of the ageing technique is still required. WCSI males mature at ~85 cm and 5–6 years, and females at ~100 cm and 7–8 years. ECSI rig probably mature at similar lengths and ages. Tagged rig have been recaptured after nearly 14 years at liberty. Longevity probably exceeds 15 years, and may exceed 20 years.

Selectivity for barramundi (Lates calcarifer) in the Fly River, Papua New Guinea: implications for managing gill-net fisheries on protandrous fishes

1998 ◽  
Vol 49 (6) ◽  
pp. 499 ◽  
Author(s):  
David A. Milton ◽  
David Die ◽  
Charles Tenakanai ◽  
Stephen Swales
Keyword(s):  
Papua New Guinea ◽  
Egg Production ◽  
Mesh Size ◽  
New Guinea ◽  
Lates Calcarifer ◽  
Gill Net ◽  
River Region ◽  
The Common ◽  
Fly River ◽  
Sexually Mature

Fishery-independent catch data from monofilament gill-nets (3.8–15.2 cm stretched mesh) were used to estimate the selectivity of each mesh size for the protandrous species barramundi, Lates calcarifer, in the Fly River region of Western Province, Papua New Guinea. These results were used with a range of life-history parameters to simulate the effects of fishing with meshes of three sizes common to the local fisheries (8.9, 10.2 and 15.2 cm) on (1) number of sexually mature females surviving to maximum age, (2) their total egg production and (3) number of mature males surviving to fertilize these eggs. Catches in most mesh sizes approximated a normal selection curve, and the mean and standard deviation of each curve were linearly related to mesh size. Juvenile and immature barramundi (<38 cm total length) were fully selected by the common mesh sizes used in the coastal subsistence and artisanal fisheries (7.6–10.2 cm) but these mesh sizes caught few sexually mature females. Population simulations showed that the number of females surviving to maximum age and their total egg production increased as mesh size was reduced. Reducing the mesh size to increase adult female escapement may be a better management strategy than increasing mesh sizes to improve recruitment.

Public Health in Papua New Guinea

1989 ◽  
Author(s):  
Donald Denoon ◽  
Kathleen Dugan ◽  
Leslie Marshall
Keyword(s):  
Public Health ◽  
Papua New Guinea ◽  
New Guinea
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