scholarly journals The dynamics of the liver weight and liver indices in the course of gonad maturation of gadid species on Eastern Kamchatka

2021 ◽  
pp. 5-26
Author(s):  
N. P. Sergeeva
Keyword(s):  
Liver Weight ◽  
Walleye Pollock ◽  
Liver Fat ◽  
Gonad Maturation ◽  
Maturity Stage ◽  
Pacific Cod ◽  
Gonad Maturity ◽  
Eastern Kamchatka ◽  
Saffron Cod ◽  
Post Spawning

Longterm data on the liver weight, hepatosomatic (HSI) and gonadosomatic (GSI) indices of walleye pollock, Pacific cod and saffron cod are analyzed on Eastern Kamchatka in seasonal aspect and in the course of gonad maturation. Individual values of the indices extensively vary and depend on the fish body length, season and stage of gonad maturity. The dynamics of the HSI is agree to the dynamics of the GSI during the year and depending on gonad maturity. The maximum values of the HSI are typical for walleye pollock and Pacific cod individuals with the gonads of the III stage of maturity. The maximum values of the index in saffron cod are found in mature individuals with immature gonads. The minimum values are demonstrated by the fish with the gonads at the stage of final spawning or of post-spawning recovery. During the annual reproduction cycle males and females of walleye pollock and cod realize different scenarios of spending and accumulating liver fat. Whereas the maximum HSI is observed in the fish with the gonads at the III maturity stage, the minimum values in males are typical for individuals with smelting gonads, and in females – on finishing the spawn. That can be connected to possible feeding for the individual. Liver weight and liver index can increase in males just shortly after finishing spawning, in females that is found only at the stage of post-spawning recovery.

scholarly journals Growth, mortality, and recruitment signals in age-0 gadids settling in coastal Gulf of Alaska

2016 ◽  
Vol 73 (9) ◽  
pp. 2227-2237 ◽  
Author(s):  
Benjamin J. Laurel ◽  
Brian A. Knoth ◽  
Clifford H. Ryer
Keyword(s):  
Early Life History ◽  
Gulf Of Alaska ◽  
Walleye Pollock ◽  
First Year ◽  
Pacific Cod ◽  
Temperature Dependent ◽  
Gadus Macrocephalus ◽  
Class Strength ◽  
Saffron Cod ◽  
Recruitment Signals

Abstract Age-0 juveniles may be the earliest, reliable indicators of recruitment into commercial marine fisheries, but independent fisheries assessments are usually conducted on older life stages in adult habitats. We used an 8 year juvenile gadid survey along the coast of Kodiak, Alaska to examine annual abundance, growth and mortality in age-0 Pacific cod (Gadus macrocephalus), with comparisons to saffron cod (Eleginus gracilis) and walleye pollock (Gadus chalcogrammus) where possible. Annual abundance of age-0 fish was positively correlated among all three species, suggesting Pacific gadids respond similarly to processes controlling pre-settlement survival and/or delivery to coastal nurseries. In Pacific cod, June temperature was positively correlated with size-at-settlement but post-settlement growth was density- rather than temperature-dependent. Age-0 abundance indices for Pacific and saffron cod predicted the number of age-1 fish the following year (i.e. positive “recruitment signals”), but only in the larger nursery (Anton Larsen Bay) where age-1 gadids were more likely to remain resident after their first year. Recruitment signals for Pacific cod improved with later estimates of age-0 abundance, likely because of high mortality following settlement in July. In contrast, very few age-0 and age-1 walleye pollock were caught across the entire time-series of the survey. Collectively, these data suggest that nearshore surveys may be a tractable means of examining early life history processes and assessing year-class strength in juvenile Pacific and saffron cod, but have relatively low value in understanding the population dynamics of walleye pollock.

scholarly journals Seasonal dynamics of gonads maturity and indices of body condition for walleye pollock Theragra chalcogramma in the northern part of the Okhotsk Sea

2015 ◽  
Vol 180 (1) ◽  
pp. 77-92
Author(s):  
Alexander I. Varkentin
Keyword(s):  
Body Condition ◽  
Seasonal Dynamics ◽  
Stage Iv ◽  
Walleye Pollock ◽  
Stage Iii ◽  
Gonad Maturation ◽  
Okhotsk Sea ◽  
Energy Potential ◽  
Gonad Maturity ◽  
Mass Spawning

Seasonal dynamics of gonad maturity and body condition indices (liver weight, hepato-somatic index, weight-size ratio) is analyzed for walleye pollock in the northern Okhotsk Sea. Its spawning season is rather long both for the whole population and any spawning ground, e.g. at West Kamchatka the fish with melting gonads is observed from December to September and probably later, but the mass spawning continues about one month - in March-April, on average. After the spawning, a new annual biological cycle begins from the period of gonad recuperation (stages of gonad maturity VI and VI-II) that continues 2-3 months followed by the period of gonad maturation from the stage III to the next spawning. The portion of the pollock females and males with the stage III is the highest in August-September, and with the stage IV - in March, before the mass spawning. In the northern Okhotsk Sea, the dynamics of maturing is similar, with the lag of 2-3 weeks. However, the gonad maturing depends on thermal conditions: they develop faster in «warm» years than in «cold» ones. Besides, big fish begin to spawn earlier than small ones spawning in the first time. Males usually stay on the spawning grounds longer than females. Body condition of walleye pollock is influenced by the process of gonad maturation. Energy potential of its individuals forms until August-September, and begins to decrease when gonads transform from the stage III to the stage IV. Later the indices of body condition continue to decrease till spawning in March-April, and melting individuals and postspawners have the lowest values. After the spawning, the indices begin to grow again because of active feeding.

scholarly journals Profile of Catfish (Clarias sp) Oocyte Exposed by Laserpuncture

2014 ◽  
Vol 5 (2) ◽  
pp. 188
Author(s):  
Dyah Hariani ◽  
Marhendra A. P. W ◽  
Aulanni Am ◽  
Suprayitno E
Keyword(s):  
Oocyte Maturation ◽  
Gonadosomatic Index ◽  
Gonad Maturation ◽  
Maturity Stage ◽  
Oocyte Diameter ◽  
Brood Stock ◽  
Gonad Maturity ◽  
Post Exposure ◽  
Egg Diameter

Anexposure of low-powered laserpuncture at reproductive acupoint of catfish brood stock is known stimulate oocyte maturation. However, the profile of oocyte resulted from laserpuncture exposure has not been known. The present study aimed to identify the profile of catfish (Clarias sp.) oocyte in post-exposure laserpuncture. A total of 48 catfishes with ages of 8-9 months was grouped into two, i.e. fishes were exposed with laserpuncture and without exposure to laserpuncture (control) with 3 replications. Laserpuncture exposure was conducted once a week until the brood stock matured. Profile of oocyte such as, the GSI value, egg diameter, total of oocytes and the gonad maturity stage were examined. The results showed that laserpuncture exposure at the catfish reproductive acupoint could trigger the oocyte development without reducing quality of the oocyte indicated by the increase of gonadosomatic index (GSI), oocyte diameter, total of oocytes and gonad maturity stage similar to control. Moreover, laserpuncture exposure accelerated the gonad maturation, three weeks faster than control.

scholarly journals Effect of Giving Different Doses of Vitamin E in Feed to the Level of Gonad Maturity of Tilapia (Oreochromis niloticus)

2021 ◽  
Vol 5 (2) ◽  
pp. 64
Author(s):  
Gunawan Tarigan ◽  
I Wayan Arthana ◽  
Dewa Ayu Angga Pebriani
Keyword(s):  
Vitamin E ◽  
Oreochromis Niloticus ◽  
Egg Quality ◽  
Reproductive Hormones ◽  
Fish Cell ◽  
Maturity Stage ◽  
Maturity Level ◽  
Gonad Maturity ◽  
Gonad Somatic Index ◽  
Different Doses

One of the nutrients that can be given to brood feed fish to improve reproductive performance and egg quality is vitamin E. Vitamin E has a very important role in increasing fish reproduction because vitamin E functions as an antioxidant that can maintain the presence of fatty acids and prevent fat oxidation in the fish cell membrane and can accelerate the secretion of reproductive hormones. This study aims to determine the effect of vitamin E in feed at different doses on the level of gonad maturity of tilapia. The research was conducted at the Fisheries Laboratory of the Faculty of Marine and Fisheries, Udayana University from July to August 2020. The samples of fish tested were tilapia (Oreochromis niloticus) obtained from the Teratai fishing pond, Sanur Bali. Vitamin E used was Ovagrow Vit E with a vitamin E content of 50%. The CRD method (completely randomized design) was used with four treatments and three replications. The doses of vitamin E that were mixed into the feed were 0, 100, 300, and 500 mg/kg of feed. The results showed that the administration of vitamin E mixed in the feed at different doses had a significant effect on the achievement of gonad maturity level, gonad somatic index (GSI), and Fecundity (P <0.05). Provision of vitamin E at a dose of 300 mg/kg of feed was the best dose for ripening tilapia gonads. The gonad maturity level developed up to maturity stage IV, the GSI value was (3.56 ± 0.46) and the fecundity value was (1379 ± 289).

scholarly journals BIOLOGI REPRODUKSI TUNA MATA BESAR (Thunnus obesus) YANG TERTANGKAP DI SAMUDERA HINDIA

2017 ◽  
Vol 3 (2) ◽  
pp. 129
Author(s):  
Ria Faizah ◽  
Budi Iskandar Prisantoso
Keyword(s):  
Indian Ocean ◽  
Gonad Development ◽  
Morphological Structure ◽  
Maturity Stage ◽  
Batch Fecundity ◽  
Gonad Maturity ◽  
Thunnus Obesus ◽  
The Indian Ocean ◽  
Index Value ◽  
Somatic Index

Tujuan penelitian ini adalah untuk mendapatkan informasi mengenai aspek reproduksi ikan tuna mata besar (Thunnus obesus) di perairan Samudera Hindia. Sebanyak 42 contoh gonad dari ikan tuna mata besar yang tertangkap perairan Samudera Hindia antara bulan Maret sampai Oktober 2008 digunakan dalam penelitian ini. Pengamatan meliputi struktur morfologi gonad ikan, perkembangan gonad, diameter telur, dan fekunditas. Hasil penelitian ini menunjukan bahwa ikantuna mata besar yang tertangkap memiliki tingkat kematangan gonad I, II, dan IV. Nilai gonado somatic index rata-rata tuna mata besar semakin meningkat seiring dengan meningkatnya tingkat kematangan gonad. Musim pemijahan untuk tuna mata besar diduga terjadi pada bulan Oktober. Tuna mata besarmemiliki fekunditas antara 8.163.715-10.365.317 butir dan memiliki pola pemijahan berganda. The objective of this research is to study the reproductive biology of big eye tuna (Thunnus obesus) from Indian Ocean. A numbers of 42 gonad samples were taken from fresh individuals captured in the Indian Ocean during period of March until October 2008. The observation comprised of morphological structure of gonad, gonad development, oocytes diameter, and batch fecundity. The results showed that the gonad maturity stages of big eye tuna were ranged from immature (the gonad maturity stage of I and II) to mature (the gonad maturity stage of IV), and the gonado somatic index value increase along with increase of gonad maturity. Spawning season for big eye tuna estimated was in October, range of fecundity were 8.163.715-10.365.317 oocytes, and the spawning type waspartial spawned.

scholarly journals Distribution, Condition and Gonad Maturity of the Invasive Pacific Oysters (Crassostrea Gigas, Thunberg 1793) in Cimanuk Delta, Indramayu, West Java, Indonesia

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Selia Hermawati ◽  
Sulistiono Sulistiono ◽  
Agustinus M Samosir
Keyword(s):  
Distribution Pattern ◽  
Crassostrea Gigas ◽  
Brackish Water ◽  
Pacific Oyster ◽  
Condition Factor ◽  
Maturity Stage ◽  
West Java ◽  
Gonad Maturity ◽  
Pacific Oysters ◽  
The Pacific

Pacific oyster (Crassostrea gigas) is an invasive species which is able to adapt a wide range of environmental conditions. The study was conducted from August to October 2014. Objective of this study was to asses the distribution pattern, condition and gonad maturity length (Lm 50%) of the Pacific oysters in mangrove ecosystem of Cimanuk Delta, Indramayu, West Java, Indonesia.  This study was conducted in two adjacent areas:  Pabean Ilir and Pagirikan subdeltas. The oysters were collected from the estuary, brackish water ponds and the coastal flat, and  observed for their abundance, total length (mm) and weight (g). Morphological and histological methods were used to estimate the gonad maturity stage. Analysis were carried out to estimate distribution pattern and condition factor. According to the study, the Pacific oyster distribution pattern was clumped. The condition factor of the oyster was higher in the brackish water pond and estuary than in the coastal flat.  The Pacific oyster was found in gonad maturity stage (GMS) I – IV. The oyster was hermaprodit protandry and had length maturity (Lm 50%) of 47,46-48,43 mm (male) and 75,27-75,50  mm (female). 

scholarly journals Thetrans-10,cis-12 isomer of conjugated linoleic acid reduces hepatic triacylglycerol content without affecting lipogenic enzymes in hamsters

2004 ◽  
Vol 92 (3) ◽  
pp. 383-389 ◽  
Author(s):  
Amaia Zabala ◽  
Itziar Churruca ◽  
M. Teresa Macarulla ◽  
Víctor M. Rodríguez ◽  
Alfredo Fernández-Quintela ◽  
...  
Keyword(s):  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Regulatory Element ◽  
Liver Weight ◽  
Liver Fat ◽  
Mrna Levels ◽  
Lipogenic Enzymes ◽  
Fat Accumulation ◽  
Triacylglycerol Content ◽  
Hepatic Triacylglycerol

Conjugated linoleic acid (CLA) refers to the positional and geometric dienoic isomers of linoleic acid. The dietary intake of CLA has been associated with changes in lipid metabolism. The aim of the present work was to assess the effects of the two main isomers of CLA on sterol regulatory element binding protein (SREBP)-1a and SREBP-1c mRNA levels, as well as on mRNA levels and the activities of several lipogenic enzymes in liver. For this purpose hamsters were fed an atherogenic diet supplemented with 5 g linoleic acid,cis-9,trans-11 ortrans-10,cis-12 CLA/kg diet for 6 weeks. Thetrans-10,cis-12 isomer intake produced significantly greater liver weight, but also significantly decreased liver fat accumulation. No changes in mRNA levels of SREBP-1a, SREBP-1c and lipogenic enzymes, or in the activities of these enzymes, were observed. There was no effect of feedingcis-9,trans-11 CLA. These results suggest that increased fat accumulation in liver does not occur on the basis of liver enlargement produced by feeding thetrans-10,cis-12 isomer of CLA in hamsters. The reduction in hepatic triacylglycerol content induced by this isomer was not attributable to changes in lipogenesis.

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