A Method of Calculating Body Lengths from Otolith Measurements for Pacific Halibut and its Application to Portlock-Albatross Grounds Data between 1935 and 1957

1962 ◽  
Vol 19 (2) ◽  
pp. 339-362 ◽  
Author(s):  
G. Morris Southward
Keyword(s):  
Growth Rate ◽  
Body Length ◽  
Average Length ◽  
Growth Patterns ◽  
Commercial Fishery ◽  
Young Fish ◽  
Pacific Halibut ◽  
Average Body Length ◽  
Average Body

A change in growth rate of the halibut from the Portlock-Albatross grounds has occurred since the early 1930's. It is possible to measure this change in growth by studying the otoliths of fish taken by the commercial fishery in subsequent years. The calculation of body lengths from otolith measurements has provided a technique of reconstructing the growth patterns of each year-class. This method has been tested using the otoliths of recovered tagged halibut. The percentage deviations from average body length at each age demonstrate an increase in average length with time over the period 1920–1956. This increase is not exhibited among young fish of ages 1 through 4; it starts approximately with age 5 and continues throughout the older ages, where it is pronounced.

scholarly journals The Rearing of Clown Loach (Chromobotia macracanthus) Larvae by Using Enriched Live Foods

2009 ◽  
Vol 8 (1) ◽  
pp. 11
Author(s):  
. Chumaidi ◽  
. Nurhidayat ◽  
A. Priyadi
Keyword(s):  
Growth Rate ◽  
Nutrient Enrichment ◽  
Fish Larvae ◽  
Average Length ◽  
Proximate Analysis ◽  
Live Food ◽  
Live Feed ◽  
Survival And Growth ◽  
Average Body Length ◽  
Average Body

<p>The enrichment of natural live  food with unsaturated fatty acid can increase survival and growth rate of fish larvae. The purpose of  this experiment was to know the effect of various natural live food with or without nutrient enrichment on survival and growth rate of clown loach (<em>Chromobotia macracanthus</em>) larvae.  The experiment was done indoor by using plastic jars filled 5 L water and aerated continuously.  Twenty clown loach larvae of four days old, 5.58 ± 0.12   mm in average length,  were stocked in plastic jars and  were reared for 28 days. The treatment were: a) <em>Artemia</em> nauplii as control;  b) rotifer without enrichment;  c) enriched rotifer, d) <em>Moina</em> nauplii without enrichment, and e) enriched <em>Moina</em> nauplii.  As enrichment agent, we used 200 mg of tuna eggs powder and 200 mg of baker's yeast which dissolved and  aerated in 2 L of water for one hour.  Proximate analysis for amino  and fatty acids content were done before the treatment, at 5 days old and at 32 days old (juvenile).  The result showed that higher survival (80.00%) and growth rate (average body length 12.80±1.85 mm) could be achieved by feeding clown loach larvae with enriched <em>Moina</em> nauplii.</p> <p>Keywords: clown loach larvae,  live feed, nutrient enrichment</p> <p> </p> <p>ABSTRAK</p> <p>Pengkayaan asam lemak tak jenuh dari pakan hidup dapat meningkatkan sintasan dan pertumbuhan larva ikan.  Penelitian dilakukan bertujuan untuk mengetahui pengaruh pakan hidup dengan atau  tanpa diperkaya nutrisinya terhadap sintasan dan pertumbuhan larva ikan botia (<em>Chromobotia macracanthus</em>).  Penelitian dilaksanakan di dalam ruangan tertutup menggunakan wadah plastik yang berisi media air 5 L serta diaerasi terus menerus.  Larva umur empat hari dengan panjang rata-rata 5,58 ± 0,12 mm ditebar sebanyak 20 ekor per wadah.  Pemeliharaan larva dilakukan selama 28 hari. Perlakuan perbedaan jenis pakan hidup dengan atau tanpa diperkaya, yaitu : a) naplii<em> Artemia</em> (kontrol), b) rotifer tanpa diperkaya nutrisinya, c) rotifer diperkaya nutrisinya, d) nauplii <em>Moina</em> tanpa diperkaya nutrisinya dan e) nauplii<em> Moina</em> diperkaya nutrisinya.  Pengkayaan pakan alami menggunakan tepung telur tuna dan ragi roti masing-masing 200 mg dalam 2 L media air yang diaerasi selama 1 jam. Analisis proksimat, asam amino dan asam lemak pakan alami  dan larva umur empat hari dilakukan sebelum penelitian dan juvenil botia 32 hari dianalisis pula.  Hasil penelitian menunjukkan bahwa sintasan (80,00%) dan pertumbuhan (panjang mutlak 12,90 ± 1,85 mm) yang tinggi dapat diperoleh dengan memberikan nauplii <em>Moina</em> yang diperkaya pada larva botia</p> <p>Kata kunci: larva ikan botia, pakan alami, pengkayaan nutrisi</p>

scholarly journals PERTUMBUHAN, UMUR, DAN DIMORFISME SEKSUAL IKAN PELANGI ARFAK, Melanotaenia arfakensis Allen, 1990 DI SISTEM SUNGAI PRAFI, MANOKWARI, PAPUA BARAT

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Emmanuel Manangkalangi ◽  
Simon P.O. Leatemia ◽  
Luky Sembel ◽  
Paskalina T. Lefaan ◽  
Ridwan Sala ◽  
...  
Keyword(s):  
Growth Rate ◽  
Sexual Dimorphism ◽  
Body Length ◽  
Standard Length ◽  
Body Height ◽  
Growth Patterns ◽  
Male Body ◽  
B Values ◽  
Endemic Fish ◽  
First Maturity

ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat.

scholarly journals SOME DATA ON BIOLOGY AND FISHERY OF ICEFISH SALANGICHTHYS MICRODON IN PETER THE GREAT BAY (JAPAN SEA)

2019 ◽  
Vol 196 ◽  
pp. 90-100
Author(s):  
L. N. Kim
Keyword(s):  
Body Length ◽  
Peter The Great Bay ◽  
Japan Sea ◽  
The Body ◽  
Spawning Period ◽  
Amur Bay ◽  
Peter The Great ◽  
Great Bay ◽  
Average Body Length ◽  
Average Body

Within Peter the Great Bay, common icefish Salangichthys microdon forms commercially valuable aggregations in two areas of the Amur Bay and in one area of the Ussuri Bay. It spawns in the internal estuaries of the rivers entered to the bays and in the external estuarine zones in the tops of the bays, mostly on small pebble grounds from late April to late May and feeds in the bays waters. Data on its size and weight composition were obtained in 2017–2018 both from the Amur Bay (for spawning period) and from the Ussuri Bay (for feeding period). During the spawning (on May 6 and May 18), the body length was 59–90 mm, on average 74.9 mm, and the weight was about 750 mg; sex ratio males : females was 1.0 : 0.8. During the feeding, the average body length was 66.8 mm.

Godzilliognomus schrami, a new species of Remipedia (Crustacea) from Eleuthera, Bahamas

Zootaxa ◽  
2010 ◽  
Vol 2491 (1) ◽  
pp. 61 ◽  
Author(s):  
THOMAS M. ILIFFE ◽  
TINA OTTEN ◽  
STEFAN KOENEMANN
Keyword(s):  
New Species ◽  
Body Length ◽  
The Other ◽  
Average Body Length ◽  
A New Species ◽  
Average Body

Godzilliognomus schrami, a new species of the crustacean class Remipedia, Yager, 1981 is the second species assigned to the genus. The new species, with an average body length of 6.8 mm, was collected from an anchialine cave on the Bahamian island of Eleuthera. Godzilliognomus schrami can be distinguished from the other species in the genus, Godzilliognomus frondosus Yager, 1989 by narrower and less trapezoidal tergites, frontal filaments that differ regarding the shape and insertion of the medial process, and dorsal antennular rami composed of only ten segments.

Inhibition of smolting in precocious male chinook salmon, Oncorhynchus tshawytscha

1991 ◽  
Vol 69 (7) ◽  
pp. 1848-1852 ◽  
Author(s):  
Chris J. Foote ◽  
W. C. Clarke ◽  
J. Blackburn
Keyword(s):  
Growth Rate ◽  
British Columbia ◽  
Specific Growth Rate ◽  
Body Length ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Specific Growth ◽  
Early Spring ◽  
Growth Patterns ◽  
Precocious Males

The ontogeny of precocious maturation in chinook salmon from Nicola River, British Columbia, was examined in conjunction with the effects of such maturation on smoltification and growth. A high proportion (56%) of male parr matured as yearlings. The growth patterns of precocious males and nonmaturing individuals of both sexes differed significantly. Precocious males appeared to grow rapidly relative to nonmaturing individuals in the early spring, but thereafter displayed a decreasing specific growth rate. In addition, precocious individuals gained more weight per increment of body length than nonmaturing individuals. The seawater adaptability of precocious individuals was lower than that of nonmaturing individuals at the three monthly sampling periods and decreased steadily as maturation proceeded.

scholarly journals Growth performance of pearl goldfish juvenile carassius auratus cultured in 3 ppt salinity with different exposure time of electric field

2015 ◽  
Vol 10 (2) ◽  
pp. 165
Author(s):  
Kukuh Nirmala ◽  
Rizky Armansyah ◽  
Agus Priyadi
Keyword(s):  
Growth Rate ◽  
Electric Field ◽  
Growth Performance ◽  
Electric Fields ◽  
Body Length ◽  
Exposure Time ◽  
Carassius Auratus ◽  
The Body ◽  
Salinity Water ◽  
Average Body

<p>ABSTRACT</p><p><br />Growth rate of pearl goldfish juvenile Carassius auratus relatively slow to reach market size which will take approximately three months. To accelerate its growth can be done by providing exposure of the fish to low-power electric fields (10 V) via 3 ppt salinity water, with the goal of providing the close isoosmotic conditions, and also to streamline the flow of electricity from the electrodes to the body of the fish. This study aims to calculate the survival and growth rate of pearl goldfish juvenile of S sizes (2‒4 cm of body length) which were maintained at 3 ppt salinity water and treated by different exposure time of electric field (zero, two, four, and six minutes before feeding) with 10 volt electric power. Fish were cultured at a density of 2 fish/L in the (20×30×20 cm3) aquaria in volume of 6 L of water. Test fish had an average body length of 4.11±0.05 cm and the average body weight of 2.89±0.05 g. Exposure time of electric field were zero, two, four, and six minutes before the fish are fed, performed every day as much as three times i.e. morning, afternoon, and evening. The research design used was completely randomized design with four treatments, namely 0, 2, 4, and 6 (time for exposure is zero/control, two, four, and six minute) with three replications. The results show test fishes exposed to 10 volt electrical field for zero, two, four, and six minutes, have no significant effect on survival rate (P&gt;0.05). For growth performance, four minute exposure treatment gives the best results compared to controls (P&lt;0.05), supported by an increase in the percentage of the ratio of gut length to body length of the fish and higher feed efficiency.<br />Keywords: long exposure to the electric field, growth performance, pearl goldfish</p><p><br />ABSTRAK</p><p><br />Pertumbuhan benih ikan hias maskoki mutiara Carassius auratus relatif lambat, karena untuk mencapai ukuran jual memerlukan waktu sekitar tiga bulan. Untuk mempercepat pertumbuhannya dapat dilakukan dengan pemberian paparan medan listrik berdaya rendah (10 V) ke air media budidaya yang dinaikkan salinitasnya menjadi 3 ppt, dengan tujuan memberikan kondisi mendekati isoosmotik, dan juga untuk mengefektifkan arus listrik dari elektroda ke tubuh ikan. Penelitian ini bertujuan untuk menghitung tingkat kelangsungan hidup dan pertumbuhan benih ikan maskoki mutiara ukuran S (2‒4 cm) yang dipelihara pada media bersalinitas 3 ppt yang diberi perlakuan lama waktu pemaparan medan listrik (nol, dua, empat, dan enam menit sebelum ikan diberi pakan) dengan daya 10 volt. Ikan dipelihara dengan kepadatan 2 ekor/L dalam akuarium berukuran 20×30×20 cm3 dengan volume air 6 L. Ikan uji yang digunakan memiliki panjang rata-rata 4,11±0,05 cm dan bobot rata-rata 2,89±0,05 g/ekor. Pemberian paparan medan listrik dilakukan selama nol, dua, empat, dan enam menit sebelum ikan diberi pakan, dilakukan setiap hari sebanyak tiga kali yaitu pagi, siang, dan sore hari. Rancangan penelitian terdiri atas empat perlakuan, yaitu 0, 2, 4, dan 6 (lama paparan nol/kontrol, dua, empat, dan enam menit) yang diulang masing-masing tiga kali ulangan. Hasil pemaparan arus listrik 10 volt selama nol, dua, empat, dan enam menit, tidak memberikan pengaruh yang nyata pada kelangsungan hidup (p&gt;0,05). Untuk kinerja pertumbuhan, perlakuan paparan empat menit memberikan hasil yang terbaik dibandingkan kontrol (p&lt;0,05), didukung oleh peningkatan persentase nilai rasio panjang usus terhadap panjang tubuh ikan serta nilai efisiensi pakan yang lebih tinggi.</p><p><br />Kata kunci: lama paparan medan listrik, kinerja pertumbuhan, ikan maskoki mutiara</p>

scholarly journals Tingkat keragaman ukuran benih ikan lele Clarias sp. yang diberi Artemia dengan periode yang berbeda

2016 ◽  
Vol 15 (2) ◽  
pp. 156
Author(s):  
Dedi Jusadi ◽  
Farida Fitriani ◽  
Julie Ekasari ◽  
Apriana Vinasyiam
Keyword(s):  
Survival Rate ◽  
Growth Performance ◽  
Size Distribution ◽  
Body Length ◽  
Size Variation ◽  
Culture Period ◽  
Medium Size ◽  
Feeding Period ◽  
Average Body Length ◽  
Average Body

<p class="NoParagraphStyle"><strong>ABSTRACT</strong></p><p class="NoParagraphStyle"> </p><p class="NoParagraphStyle">This research was conducted to evaluate the effect of different <em>Artemia</em> feeding period on the size variation of catfish <em>Clarias</em> sp. larvae. One thousand two days post hatched larvae with an average body length of 0.7±0.03 cm were randomly distributed into 25 L round plastic tanks. The treatment conducted for 13 days with four treatment; without<em> Artemia</em>, given <em>Artemia</em> 1, 2, or 3 days in the first culture period. The results showed that 15 days old fish has the same survival rate in all treatments; and has two size distribution i.e. the small size (S) and medium size (M). Increasingly the period of administration of <em>Artemia</em>, the percentage of the amount of M-size fish increases, thereby giving <em>Artemia</em> were able to increase growth of larvae. Feeding catfish with <em>Artemia</em> for two days has shown producing better growth.</p><p class="NoParagraphStyle"> </p><p class="NoParagraphStyle">Keywords: catfish, <em>Artemia</em>, size variation, growth performance</p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle"><strong>ABSTRAK</strong></p><p class="NoParagraphStyle"> </p><p class="NoParagraphStyle">Penelitian ini dilakukan untuk mengevaluasi pengaruh perbedaan periode pemberian pakan <em>Artemia </em>terhadap kinerja pertumbuhan larva ikan lele <em>Clarias </em>sp. Seribu ekor larva lele yang berumur dua hari dengan panjang rata-rata 0,7±0,03 cm ditebar dalam wadah dengan volume air 25 L. Budidaya ikan dilakukan selama 13 hari dengan empat perlakuan, yaitu perlakuan tanpa pemberian <em>Artemia</em>, pemberian <em>Artemia</em> selama satu, dua, atau tiga hari di awal masa budidaya. Hasil penelitian menunjukkan bahwa ikan umur 15 hari memiliki sintasan yang sama di semua perlakuan, serta memiliki dua sebaran ukuran, yakni ukuran kecil (S) dan ukuran sedang (M). Semakin lama periode pemberian <em>Artemia</em>, persentase jumlah ikan ukuran M meningkat, sehingga pemberian <em>Artemia</em> pada larva ikan lele mampu meningkatkan pertumbuhan. Pemberian <em>Artemia</em> selama dua hari memberikan pertumbuhan yang lebih baik.</p><p class="NoParagraphStyle"> </p><p>Kata kunci: ikan lele, <em>Artemia</em>, keragaman ukuran, kinerja pertumbuhan</p>

scholarly journals PENGAMATAN PENDAHULUAN OVARIUM BANDIKUT (Echymipera kalubu)

2018 ◽  
Vol 8 (2) ◽  
pp. 83
Author(s):  
Fahry Rafli ◽  
Angel N. Tethool ◽  
Freddy Pattiselanno
Keyword(s):  
Average Length ◽  
Reproductive Organs ◽  
Descriptive Statistics ◽  
Average Weight ◽  
Physical Description ◽  
Surgical Tool ◽  
Average Body Length ◽  
Average Body ◽  
Female Reproductive Organs ◽  
Average Body Weight

The study aimed to determine the size and physical description (location, shape, colour and texture) ovarian of Echymipera kalubu. Study was conducted in 3 months from June to September 2017. Three female E. kalubu with an average body weight 399±97.32g and average body length 21.67±5.51cm were used in this study. Sample of bandicoots were dissected using a surgical tool and then measured using measuring tester and analytic scales. Descriptive statistics was used to analyse the data. The results showed that average length of female reproductive organs of E. kalubu was 11,00±0,87 cm (right) and 11,03±0,83 cm (left); average weight of ovarian was 0,01±0,0048 g (right) and 0,02±0,0006 g (left). This study also showed that characteristics of ovarian were in common with other polytocus animals.

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