Cannibalism in juvenile black rockfish, Sebastes schlegelii (Hilgendorf, 1880), reared under controlled conditions

Xi, Dan; Zhang, Xiumei; Lü, Hongjian; Zhang, Zhixin

doi:10.1016/j.aquaculture.2017.07.007

Cited by 28 publications

(15 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in practice, some fish farms may feed juvenile black rockfish 2 or 3 times per day, and the larvae may be fed 3 to 5 times a day during weaning. This is intended to reduce cannibalism in fish groups during high‐risk periods, for example when juveniles are reared in large high‐density commercial rearing structures (Xi, Zhang, Lü, & Zhang, 2017). More meals per day with a fixed ration may provide more opportunities for smaller, less aggressive fish to eat, thereby reducing growth heterogeneity and cannibalism (Guo, Dong, Zhang, et al, 2017; Guo, Zhang, & Johnsson, 2017; Schnaittacher, King, & Berlinsky, 2005; Xi et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

Effects of different feeding regimes on juvenile black rockfish ( Sebastes schlegilii ) survival, growth, digestive enzyme activity, body composition and feeding costs

Guo

Roques

Li³

et al. 2020

Aquac Res

Self Cite

View full text Add to dashboard Cite

The objective of this study was to establish a proper feeding regime for juvenile black rockfish (Sebastes schlegilii) intended for stock enhancement. We used a combined experimental design to assess the effects of different feeding rates (1%, 3% and 5% body weight per day (BW/day)) and feeding frequencies (apparent satiety or restricted feeding 1 to 3 times daily) on survival, growth, digestive enzyme activity, body composition and feeding costs over 50 days, from newly weaned (initial average weight 1.5 ± 0.2 g) to release size. The results showed that feeding rate significantly affected fish growth, feed utilization and body composition. The highest feed conversion ratio was at 3% BW/day. Increased feeding rates resulted in enhanced growth and higher body lipid content, but this was also accompanied by decreased contents of moisture, protein and ash. With feeding to apparent satiety, increased feeding frequency resulted in higher growth performance and enhanced intestinal lipase activity but decreased gastric protease activity. There were no growth improvements or effects on digestive enzyme activity and body composition with increasing feeding frequency (from one to three times daily) under a fixed‐quantify feeding (3% BW/day). Feed costs increased with increasing feeding rates or apparent satiety feeding frequencies and were associated with shorter growth times to reach a suitable size for release. Our study suggests that a feeding rate of 3% BW/day is the best feeding regime for proper growth and reduced feed costs in juvenile black rockfish before releasing for stock enhancement.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of different feeding regimes on juvenile black rockfish ( Sebastes schlegilii ) survival, growth, digestive enzyme activity, body composition and feeding costs

Guo

Roques

Li³

et al. 2020

Aquac Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…Under artificial feeding conditions, the cannibalism-derived loss rate of Asian seabass Barramundi juveniles was 1.08% per day, whereas in the test group that did not feed for 24 h, the rate was 2.30% (Liu et al 2017). When starvation for more than 12 h, black rockfish Sebastes schlegelii juveniles exhibited a significant increase in cannibalism frequency (Xi et al 2017). Ribeiro et al (2015) found that under conditions of low feeding frequency, the competition for food was high, leading to heterogeneous growth, size differentiation, and ultimately cannibalism in barramundi Lates calcarifer juveniles.…”

Section: Food Abundancementioning

confidence: 97%

“…These prawns are nocturnal, and under dark conditions when activity level is high, cannibalism increases, whereas intensive or long-term light conditions inhibit larval activity, decrease their encounter rate, and thus reduce cannibalism (Chen et al 2003). Xi et al (2017) found that phototactic fish, such as black rockfish Sebastes schlegelii juveniles, tend to congregate at the bottom of water bodies during darkness, thereby increasing the chance of cannibalism, whereas light facilitates their dispersion, thereby reducing cannibalism (Li et al 2013). Adamek et al (2011) also found that low-intensity light effectively suppresses cannibalism and improves the survival rate of African catfish Clarias gariepinus (photophobic speccies) larval juveniles.…”

Section: Lightmentioning

confidence: 99%

“…Moreover, the number of shelters should be adequate to meet the needs of all individuals; if the number of shelters is too small, individuals may compete for shelters, likely increasing the frequencies of cannibalism or territorial invasion (Hecht et al 1993). Xi et al (2017) installed triangular PVC panel shelters for rockfish Sebastes schlegelii juveniles and found that, when other conditions were constant, the higher the shelter density, the lower the cannibalism incidence among juveniles. Fang et al (2011) showed that the number of bamboo shelters had no significant effect on the survival or growth of red swamp crayfish Procambarus clarkia, likely because the additional aquatic plants that were installed in the upper, middle and lower layers of the aquaculture water had already provided sanctuaries for these aquatic animals.…”

Section: Shelter Arrangement and Quantitymentioning

confidence: 99%

See 1 more Smart Citation

Research progress on the cannibalistic behavior of Aquatic Animals and The Screening of Cannibalism-Preventing Shelters (Review)

He¹,

Shi²,

WenJun³

et al. 2020

Israeli Journal of Aquaculture - Bamidgeh

View full text Add to dashboard Cite

Cannibalism refers to maiming and killing among individuals of the conspecifics, and plays a key role in controlling animal population numbers and ensuring reproduction (i.e., eliminate the waste of food and space by weaker individuals). However, cannibalism in aquaculture directly reduces the survival rate and the production of farmed animals. Therefore, reduction in the incidence of cannibalism in farmed aquatic animals has been of great interest to the aquaculture industry. In this paper, we review factors affecting the cannibalistic behavior of aquatic animals and the research progress on the screening of shelters to prevent cannibalism. These shelters focus on the animals and their external environment. We also discuss prospects for future research. The purpose of this review is to provide a scientific reference for the study of cannibalistic behavior of aquatic animals and a theoretical basis for the development of cannibalism-preventing shelter technologies for aquatic animal farming.

show abstract

“…Type I is the condition of the seed with tail damage, intact body but had bite marks on the stomach, head, or body partially eaten. Type II is the condition of the whole seed eaten from head to tail (Xi et al, 2017).…”

Section: Observation Of Aggressive Behavior and Cannibalismmentioning

confidence: 99%

The use of different 17β-estradiol hormone doses and water temperatures to control cannibalism in catfish Clarias gariepinus seed

Putri

Zairin

Carman

et al. 2020

Jurnal Akuakultur Indonesia

View full text Add to dashboard Cite

Cannibalism is a major problem in the intensive catfish hatchery that caused high mortality. This phenomenon is allegedly due to the high level of testosterone hormones in the early larvae and seed stages. Testosterone is a maternal steroid hormone that is transferred directly by the parent to the egg. Catfish broodstock has high testosterone levels during the gonad maturation phase and it enters the eggs during the process of vitellogenesis. A high level of testosterone is considered to cause catfish seeds to behave aggressively and subsequently encourage cannibalism. This testosterone level may be reduced by estrogen through a negative feedback mechanism. This experiment aimed to evaluate the use of several 17β-estradiol doses at different water temperatures to control cannibalism in catfish seeds. This experiment used two factors, i.e. 17β-estradiol doses (0, 20, and 50 mg/kg) coated in the diet and water temperatures (28 and 31°C). The results showed that 17β-estradiol levels in catfish seeds increased with increasing experimental length. The use of 17β-estradiol at low water temperature (28°C) was better in decreasing mortality, while the dose of 50 mg/kg17β-estradiol which applied at 28°C was the best combination in controlling cannibalism on catfish seeds. Keywords: 17β-estradiol, cannibalism, Clarias gariepinus, seed. ABSTRAK Kanibalisme merupakan salah satu masalah utama dalam pembenihan ikan lele intensif karena menyebabkan kematian yang tinggi. Fenomena ini diduga karena kadar hormon testosteron yang tinggi pada tahap larva dan benih. Testosteron merupakan hormon steroid maternal yang ditransfer secara langsung oleh induk ke telur. Induk ikan lele memiliki kadar testosteron yang tinggi pada fase pematangan gonad dan masuk ke dalam telur selama proses vitelogenesis. Tingginya kadar testosteron diduga menyebabkan benih berperilaku agresif dan akan mendorong kanibalisme. Kadar testosteron dapat ditekan dengan meningkatkan kadar hormon estrogen melalui mekanisme feedback negatif. Penelitian ini bertujuan mengevaluasi penggunaan dosis estradiol-17β dan suhu pemeliharaan yang berbeda untuk mengendalikan kanibalisme pada benih ikan lele. Penelitian ini menggunakan dua faktor yaitu dosis estradiol-17β yang berbeda (0, 20, dan 50 mg/kg) yang diberikan melalui pakan, dan suhu pemeliharaan yang berbeda (28 dan 31°C). Hasil penelitian menunjukkan bahwa konsentrasi estradiol-17β pada benih ikan lele meningkat seiring dengan lamanya pemeliharaan. Penggunaan estradiol-17β pada suhu 28°C lebih baik dalam mengurangi mortalitas, sementara dosis estradiol-17β 50 mg/kg pada suhu pemeliharaan 28°C adalah kombinasi terbaik dalam mengendalikan kanibalisme pada benih ikan lele. Kata kunci: benih, Clarias gariepinus, estradiol-17β, kanibalisme.

show abstract

Cannibalism in juvenile black rockfish, Sebastes schlegelii (Hilgendorf, 1880), reared under controlled conditions

Cited by 28 publications

References 35 publications

Effects of different feeding regimes on juvenile black rockfish ( Sebastes schlegilii ) survival, growth, digestive enzyme activity, body composition and feeding costs

Effects of different feeding regimes on juvenile black rockfish ( Sebastes schlegilii ) survival, growth, digestive enzyme activity, body composition and feeding costs

Research progress on the cannibalistic behavior of Aquatic Animals and The Screening of Cannibalism-Preventing Shelters (Review)

The use of different 17β-estradiol hormone doses and water temperatures to control cannibalism in catfish Clarias gariepinus seed

Contact Info

Product

Resources

About