Relationships amongst length, weight and growth of north-eastern New Zealand reef fishes

1998 ◽  
Vol 49 (3) ◽  
pp. 255 ◽  
Author(s):  
Richard B. Taylor ◽  
Trevor J. Willis
Keyword(s):  
New Zealand ◽  
Growth Parameters ◽  
Reef Fishes ◽  
Fish Growth ◽  
Regression Equations ◽  
Strong Positive Correlation ◽  
Teleost Fishes ◽  
Growth Data ◽  
North Eastern ◽  
Adult Body

This paper examines relationships amongst length, weight and growth parameters of teleost fishes found in shallow north-eastern New Zealand waters. Length–weight equations are presented for 51 species. Fish growth was described using the von Bertalanffy growth parameters L∞ (asymptotic length) and K (growth constant), which were available for 19 species. Literature-derived values for adult body length showed a strong positive correlation with L∞ (r2 = 0.89), which, after conversion to weight, was strongly negatively correlated with K (r 2 = 0.80). Regression equations describing these relationships can be used to predict L∞ and K for fish species lacking such growth data.

scholarly journals Biological parameters of Luciobarbus callensis populates Beni-Haroun dam, north-eastern Algeria

2020 ◽  
Vol 21 (12) ◽  
Author(s):  
Houda Berrouk ◽  
Fatiha Sahtout ◽  
Chahinez Boualleg
Keyword(s):  
Growth Parameters ◽  
Economic Value ◽  
Age And Growth ◽  
Growth Data ◽  
Naked Eye ◽  
North Eastern ◽  
Major Process ◽  
Eastern Algeria ◽  
A Minor ◽  
Autochthonous Species

The fish age and growth data mainly assist many ichthyologists to understand the life history features of species and population. The growth is a major process of fish biology, and considered as one of the key processes of length-structured models of fishes. Thus,   the present study was devoted to studying the growth of an autochthonous species (Luciobarbus callensis), populating the dam of Beni-Haroun (Mila city, northeast Algeria), and is known by its socio-economic value and aquaculture interest. The study was conducted on a sampling of 257 fish individuals during the year 2015 – 2016. The age of Luciobarbus callensis was determined by using the described method or the scalimetry method, providing an easier sampling and reading procedures, and also a high precision.  Fish sexes were identified via the observation of gonads, by naked eye based on gonad shape and color, where the number of females was higher (165) than males (92). The obtained results revealed a maximum longevity as seven years of Luciobarbus callensis, and the determined growth parameters of the separated and combined fish sexes were found to be as follow: L∞= 47,37  cm ; K= 0,29  ; t0= -0,51  ; Ø’= 2,813 (females); L∞= 42,11  cm ; K =0,26  ; t0= -0,58 ; Ø’= 2,663 (males); and  L∞= 47 37  cm ; K= 0,20 ; t0= -0,75 ;  Ø’ =2,652 (combined sex). Moreover, the evolution of the total weight of fishes with respect to their size presents a minor allometry (b<3), (with or without sex distinction).

scholarly journals EFEK KERAGAMAN TIPE HABITAT TERHADAP STRUKTUR POPULASI DAN MORFOMETRIK ABALON HALIOTIS ASININA LINNAEUS, 1758

2020 ◽  
Vol 20 (1) ◽  
pp. 29
Author(s):  
Ermayanti Ishak ◽  
Isdradjad Setyobudiandi ◽  
Fredinan Yulianda ◽  
Mennofatria Boer ◽  
Bahtiar Bahtiar
Keyword(s):  
Growth Parameters ◽  
Strong Relationship ◽  
Growth Patterns ◽  
Size Class ◽  
Regression Equations ◽  
Growth Data ◽  
Habitat Types ◽  
Haliotis Asinina ◽  
Rocky Habitats ◽  
The Relationship

Abstrak:  Abalon (H.asinina) adalah kelompok gastropoda laut bernilai komersial dan tersebar di perairan Soropia Sulawesi Tenggara.  H. asinina menyukai tipe habitat khusus, seperti habitat berbatu yang ditumbuhi alga dan habitat padang lamun. Bokori dan Toronipa mewakili 2 tipe habitat khusus tersebut yang lokasinya berada di perairan Soropia. Penelitian bertujuan untuk mengkaji pertumbuhan populasi abalon (H. asinina) pada habitat yang berbeda melalui hubungan dimensi morfometrik, faktor kondisi, dan komposisi kelompok ukuran. Data pertumbuhan dianalisis dengan persamaan regresi non linier menggunakan program data analisis dalam MS. Excel 2010. Hubungan antara L dengan Wt dan L dengan Lc di 2 lokasi menunjukkan hubungan yang positif dan kuat (R2 < 70%), sedangkan hubungan antara L dengan dimensi lainnya seperti Bc, Tc, Lc, dan Vc menunjukkan hubungan yang lemah.  Pola pertumbuhan di Bokori terdiri atas pertumbuhan isometrik dan alometrik negatif, sedangkan Toronipa, pola pertumbuhannya alometrik negatif.   Faktor kondisi rata-rata berfluktuasi setiap bulan dengan nilai tertinggi di Bokori. Perairan Bokori didominasi oleh persentase kelompok juvenil sebesar 52.22% pada kelas ukuran 27.4-49.62 mm. Toronipa didominasi oleh persentase kelompok dewasa sebesar 66.67% pada kelas ukuran 50.62-84.42 mm. Keragaman tipe habitat memengaruhi parameter pertumbuhan abalon (H.asinina). Hasil penelitian diharapkan menjadi informasi penting bagi upaya merumuskan pengelolaan sumber daya abalon yang tepat.Kata Kunci: Keragaman Habitat, Pertumbuhan, H. asinina, Morfometrik, Struktur PopulasiAbstract: Abalone (Haliotis asinina) is a marine gastropod which has commercial value. Abalone spread in the waters of Soropia, Southeast Sulawesi.  H. asinina likes special habitat types, such as rocky habitats overgrown with algae and seagrass habitats. Bokori and Toronipa represent these two special habitat types which are located in Soropia waters. The study aims to assess the growth of abalone (H. asinina) populations in different habitats through the relationship of morphometric dimensions, condition factors, and composition of size groups.  Growth data were analyzed by non-linear regression equations using data analysis programs in MS. Excel 2010.  The relationship between L with Wt and L with Lc at 2 locations shows a positive and strong relationship (R2 <70%), while the relationship between L and other dimensions such as Bc, Tc, Lc, and Vc shows a weak relationship.  Growth patterns in Bokori consist of isometric and allometric negative growths, while Toronipa, the pattern of negative allometric growth. The average condition factor fluctuates in each month of observation and the highest in Bokori.  Bokori waters are dominated by percentage of juvenile groups of 52.22%  in the size class of 27.4-49.62 mm. Toronipa is dominated by adult or broodstock abalone of 66.67% in the size class of 50.62-84.42 mm.  Toronipa is dominated by the percentage of the adult group at 66.67% in the size class of 50.62-84.42 mm. The diversity of habitat types affects the growth parameters of abalone (H.asinina).  The results of study are expected to be important information for efforts to formulate appropriate abalone resource management.Keywords: Diversity of Habitat, Growth, H. asinina, Morphometric, Population structure

scholarly journals Cultivation and Propagation of Iris laevigata Fisch., an Endangered Ethno-medicinal Plant of Imphal Valley Manipur, India

2021 ◽  
Vol 13 (5) ◽  
pp. 153
Author(s):  
S. Sanjay Singh ◽  
Rocky Thokchom ◽  
Jenita Thokchom ◽  
Soumitra Sankar Das ◽  
Arvind S. Dhabe ◽  
...  
Keyword(s):  
Growth And Development ◽  
Leaf Surface ◽  
Growth Parameters ◽  
Block Design ◽  
Strong Positive Correlation ◽  
Eastern India ◽  
Randomized Block Design ◽  
North Eastern ◽  
Leaf Surface Area ◽  
Conservation Method

Iris laevigata Fisch., is restricted geographically in Manipur, north eastern India. An experiment was planned with Factorial Randomized Block Design during 2018 to 2020 (3 seasons) in the study plots of ICAR Research Complex for NEH Region, Manipur Centre, Lamphelpat. The study encompasses on the growth and development of I. laevigata seedlings collected from Ipa Thoukok Complex: influenced by spacing, trimming and correlations amongst the growth parameters, so as to validate the most favourable conservation method for this endangered plant. Among the treatments, T6 = S2T3 (45 cm &times; trimming 40 DAT) was found the best treatment. T9 = S3T3 (60 cm &times; trimming 40 DAT) was second, T3 = S1T3 (30 cm &times; trimming 40 DAT) was the third and lowest was found in case of T1 = S1T1 (30 cm &times; 0 trimming, i.e., without trimming). Strong positive correlation between leaf surface area and plant height on the growth and development was found to be effective among other correlations.

scholarly journals EFEK DARI PEWARNA BATIK BERBAHAN DASAR SAMPAHMANGROVE (Rhizophora sp.): UJI TOKSISITAS TERHADAP IKAN GUPPY(Poecilia reticulata) DAN Chlorella pyrenoidosa

2016 ◽  
Vol 5 (4) ◽  
pp. 190-198
Author(s):  
Fentika Rahma Mentari ◽  
Boedi Hendrarto ◽  
Haeruddin Haeruddin
Keyword(s):  
Growth Rate ◽  
Poecilia Reticulata ◽  
Block Design ◽  
Liquid Waste ◽  
Fish Growth ◽  
Regression Equations ◽  
Growth Data ◽  
Chlorella Sp ◽  
Effect Concentration ◽  
Split Plot

ABSTRAK Sampah mangrove (Rhizophora sp.)telah dimanfaatkan sebagai pewarna alami untuk batik. Pemanfaatan ini diduga akan menghasilkan limbah cair yang dibuang langsung ke lingkungan perairan yang dapat menyebabkan pencemaran perairan dan meracuni biota air. Oleh karena itu diadakan penelitian untuk mengetahui efek pembuangan sisa pewarnaan batik dari limbah mangrove (Rhizhophora sp.) terhadap ikan dan alga. Metode penelitian yang digunakanadalah eksperimental skala laboratoris dengan menggunakan ikan guppy (P. reticulata) dan alga C. pyrenoidosa menyertakan uji toksisitas. Analisis data menggunakan analisis probit dengan persamaan regresi untuk mendapatkan nilai (LC50) 96 jam dan (IC50) 96 jam. Pertumbuhan ikan guppy dianalisa menggunakan analisis ANOVA dua faktor rancangan blok random lengkap dan data pertumbuhan alga dianalisa menggunakanANOVA petak terpisah. Data pertumbuhan ikan dan alga dianalisa dengan uji lanjut Dunnet untuk mengetahui nilai LOEC (Lowest-Observed Effect Concentration).Hasil yang diperoleh adalah nilai konsentrasi (LC50) 96 jam pada limbah pewarna batik mangrove adalah 29% dan diketahui mampu memberikan pengaruh nyata dalam menghambat laju pertumbuhan berat pada hewan uji ikan guppy (P < 0,05) dan mampu menghambat laju pertumbuhan Chlorella sp. dengan nilai konsentrasi penghambatan media (IC50) 96 jam adalah61,70%. Uji anova split plot in time pada konsentrasi 1,5625% memberikan pengaruh nyata (P < 0,05) pada jam ke-48 dalam pertumbuhan C. pyrenoidosa dengan nilai konsentrasi LOEC adalah 1,5625%.  Kata kunci: Toksisitas;Rhizopora sp.; Ikan Guppy;Chlorella sp.  ABSTRACT Mangrove litters (Rhizophora sp.) has been used as a natural dye for batik. This utilization is expected to produce liquid waste which is dumped directly into the aquatic environments which may cause water pollution and poisoning aquatic organism. Therefore it was necessary to do the research to determine the effect of  batik dye from mangrove (Rhizophora sp.) against fish and algae. The methods used in this research was experimental laboratory scale using guppies (P. reticulata) and algae C. pyrenoidosa including toxicity test. The analysis of data used probit analysis with regression equations to get the value of (LC50) 96 hours and (IC50) 96 hours. Guppy fish growth data were analyzed using a complete random block design two way ANOVA and data of alga growth were analyzed with split plot analysis of variance. Fish and algae growth data were analyzed by a further test to determine the value of LOEC (Lowest-Observed Effect Concentration). Results obtained concentration values (LC50) 96 hours on mangrove batik dye waste was 29% and it was known to give significant effect in inhibiting the growth rate of the weight in  the guppies animals test (P < 0,05), and also was able to inhibit the growth rate of C. pyrenoidosa with a medium inhibitory concentration values (IC50) 96 hours are61,70%. The test of split plot in time anova on the concentration of  1,5625% was giving significant effect (P < 0,05) at the 48th hour in the growth of C. pyrenoidosa with the concentration of LOEC was 1,5625%.  Keywords: Toxicity;Rhizoporasp.; Poecilia reticulata; Chlorella sp.

scholarly journals Optimization of hormonal dose during masculinization of tilapia (Oreochromis niloticus) fry

2012 ◽  
Vol 9 (2) ◽  
pp. 359-364 ◽  
Author(s):  
Z Ferdous ◽  
MM Ali
Keyword(s):  
Weight Gain ◽  
Oreochromis Niloticus ◽  
Fish Growth ◽  
Daily Weight Gain ◽  
Optimum Dose ◽  
Trial Period ◽  
Growth Data ◽  
Average Daily Weight Gain ◽  
Male Population ◽  
Commercial Feed

The experiment was conducted to optimize the dose of 17?-methyl testosterone (MT) during masculinization of tilapia (Oreochromis niloticus) fry. Five treatments were designed with various doses of hormone to find out the most effective one. The treatments were designated as T1 (0 mg MT/kg), T2 (40 mg MT/kg), T3 (50 mg MT/kg), T4 (60 mg MT/kg) and T5 (70 mg MT/kg). MT was administered orally by using nursery feed and Ethanol (as hormone carrier solvents) diet to tilapia fry for 28 days in hapa. After completion of the trial period of 28 days nursing of the experimental fry was continued for further 2 months with commercial feed. At the end of experiment the sex ratio was      determined by examining gonad after dissecting the fish. Growth performance was monitored by recording the morphometric characteristics i.e. weight gain (g), average daily weight gain (g). The analysis of growth data showed significant variation in weight, % weight gain, SGR (% /day) of fish among the different treatments. SGR increases with the increase of hormone dose. The present study demonstrated that all MT receiving treatments showed a significantly (p<0.01) higher male proportion (94.28%) than control (48.57%). The dose of 60 mg MT/kg of feed resulted in maximum male population (94.28%). The result indicated that the optimum dose of MT hormone was 60 mg /kg with a feeding period of 28 days after hatching.   DOI: http://dx.doi.org/10.3329/jbau.v9i2.11052   J. Bangladesh Agril. Univ. 9(2): 359–364, 2011

scholarly journals Relative Importance of Cleaning Behaviour in Centrolabrus Exoletus and other Wrasse at Arrábida, Portugal

1997 ◽  
Vol 77 (3) ◽  
pp. 891-898 ◽  
Author(s):  
Miguel Henriques ◽  
Vitor C. Almada
Keyword(s):  
Reef Fishes ◽  
Relative Importance ◽  
Cleaner Fish ◽  
Cleaning Behaviour ◽  
North Eastern ◽  
In Captivity ◽  
Tropical Reef ◽  
Ctenolabrus Rupestris ◽  
Labrus Bergylta ◽  
Host Fishes

Underwater behavioural observations were conducted to evaluate the relative importance of cleaning behaviour in three species of common north-eastern Atlantic wrasse (Teleostei: Labridae). At the study site, the only cleaner was Centrolabrus exoletus. A total of 12 species was cleaned, with the wrasse, Symphodus melops and Labrus bergylta being the species most frequently cleaned. Neither S. melops nor Ctenolabrus rupestris, known to be cleaners in other sites or in captivity, could be observed cleaning other fishes. Centrolabrus exoletus was found to be a facultative cleaner fish with cleaning acts representing only 7% of the observed feeding acts. In focal observations of host fishes, the incidence of cleaning acts reached a level (11 h-1 per host) similar to that reported for tropical reef fishes and probably reflects the high numbers of cleaners available. Some factors that may affect the origin of the cleaning interactions are discussed.

Does Economic Growth Pay Political Dividends in India?

2019 ◽  
Vol 67 (1-2) ◽  
pp. 166-169
Author(s):  
Vasant V. Bang ◽  
Alok Kumar Mishra
Keyword(s):  
Economic Growth ◽  
Growth Rates ◽  
Regression Equations ◽  
Economic Policies ◽  
Growth Data ◽  
Parliamentary Elections ◽  
Independent Variables ◽  
Economic Development And Growth ◽  
Bharatiya Janata Party ◽  
Ruling Party

Since independence in 1947, India has witnessed several changes in economic policies of governments. Economic reforms were started in India in 1984 and were accelerated later in 1991. It is believed that Bharatiya Janata Party won the 2014 parliamentary elections on the promise of economic development and growth. In this article, an attempt has been made to investigate the link between economic and electoral performances in Indian elections. The data for 1951–2014 period has been analysed by establishing regression equations using vote percentage received by a ruling party as dependent variable and sectoral economic growth during the ruling tenure as independent variables. Comparisons have been made between the pre- and post-1984 eras. An important contribution of this article is that it highlights the fact that electoral performances can be better explained using sectoral growth data as compared to overall GDP growth rates. The article also highlights a significant role played by volatility in growth rates.

Growth Models with Corrections for the Retardative Effects of Tagging

1994 ◽  
Vol 51 (2) ◽  
pp. 263-267 ◽  
Author(s):  
Yongshun Xiao
Keyword(s):  
Growth Parameters ◽  
Growth Models ◽  
Simulated Data ◽  
Fish Growth ◽  
Lates Calcarifer ◽  
General Utility ◽  
Potential Applications ◽  
Length Increment ◽  
Animal Growth ◽  
Special Case

Length increment data from mark–recapture experiments are commonly used to obtain information on animal growth, assuming that tagging does not affect the growth of marked animals. The assumption is violated in many studies, but the effects of tagging on growth and estimates of growth parameters have not been and cannot be examined without appropriate models. This paper describes a model allowing quantification and estimation of the retarding effects of tagging on animal growth simultaneously with growth parameters in all existing growth models, reduction or elimination of biases in growth parameters induced by tagging, and relaxation of a key assumption in growth analysis using length increment data. A special case of this model was applied to simulated data and to tagging data from a centropomid perch (Lates calcarifer) to demonstrate its general utility. Tagging was inferred to have stopped the fish growth for 36.44 d (ASE = 12.70 d) if von Bertalanffy growth is assumed, but the period of recovery from tagging seemed size or age independent within the size range studied. If tagging retards animal growth, L∞ is slightly overestimated and K underestimated for unbiased data. Potential applications and limitations of the model are also discussed.

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