Variation in Body Weight and Total Length Among Families of White Bass,Morone chrysops, Fry After Communal Rearing

Rainbow trout (Salmo gairdneri), white sucker (Catostomus commersoni), white bass (Morone chrysops), smallmouth bass (Micropterus dolomieui), and yellow perch (Perca flavescens) were collected from Lakes Ontario and Erie to examine the relationship between contaminant levels in females and their eggs. Factors such as the percent lipid in the fish and percent of total lipid deposited in the eggs significantly influenced (P < 0.01) contaminant transfer. The percentages of the 9–11 organic contaminants transferred generally showed less variation within a species than the percentages for a substance transferred among the five species examined. This relationship was consistent even though there was over a 10-fold range in contaminant concentrations within a given species. Mercury did not demonstrate this response because the percentage in eggs was low for all species. The levels of PCB monitored in eggs of rainbow trout collected from Lake Ontario suggest that egg and fry survival rates could be affected based on the toxicological evidence from other studies. An examination of the possible effects of spawning on the kinetics of contaminants among these species suggests that relative body concentrations of organic contaminants may be decreased by 5% or be increased by 10%, and mercury levels may be increased by 6–22% following the deposition of eggs. The amount of change varies with species and is influenced by the percent egg weight of body weight, and the rate of contaminant transfer from females to eggs.Key words: toxicology, contaminants, reproduction, Lake Ontario, Lake Erie

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On a saddled snake eel Pisodonophis semicinctus (Osteichthyes: Ophichthidae) trawled in the Strait of Sicily (Mediterranean Sea)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400002988 ◽

2000 ◽

Vol 80 (5) ◽

pp. 951-952 ◽

Cited By ~ 1

Author(s):

Sergio Ragonese ◽

Giovan Battista Giusto

Keyword(s):

Body Weight ◽

Mediterranean Sea ◽

Bottom Trawl ◽

Northern Coast ◽

Rare Finding ◽

Strait Of Sicily ◽

Total Length ◽

The Mediterranean

The occurrence in the Strait of Sicily of the saddled snake eel, Pisodonophis semicinctus (Osteichthyes: Ophichthidae), a rare finding for the Mediterranean Sea, is confirmed on the basis of one specimen caught off the northern coast of Tunisia in 1991. The specimen, 800 mm in total length and 457 g in body weight (preserved condition), was captured during a commercial bottom trawl hauled at 30 m next to Cape Bon (north of Tunisia). This represents the second and fourth documented record of this Atlantic intruder within the Strait of Sicily and the Mediterranean Sea, respectively.

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PERTUMBUHAN LARVA DAN PRODUKSI BENIH IKAN KERAPU BEBEK Cromileptes altivelis Valenciennes, 1828 HASIL BUDIDAYA TURUNAN KE-3

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v10i3.20322 ◽

2018 ◽

Vol 10 (3) ◽

pp. 589-600

Author(s):

Regina Melianawati ◽

Ni Wayan Widya Astuti ◽

. Tridjoko

Keyword(s):

Body Weight ◽

Survival Rate ◽

Seed Production ◽

Larval Growth ◽

The Body ◽

Third Generation ◽

Larval Body ◽

Spine Length ◽

The Third ◽

Total Length

ABSTRAKKetersediaan induk dalam suatu usaha pembenihan memiliki peran yang sangat penting. Namun demikian, ketersediaan induk yang berasal dari alam sangat terbatas jumlahnya, sehingga perlu dilakukan penyediaan calon induk yang berasal dari hasil budidaya. Ikan kerapu bebek Cromileptes altivelis Valenciennes, 1828 turunan pertama (F-1) dan turunan kedua (F-2) sudah dapat diproduksi dari hasil budidaya, namun benih turunan ketiga (F-3) belum dapat diperoleh. Penelitian ini bertujuan untuk mendapatkan karakteristik morfologis dan pertumbuhan larva ikan kerapu bebek F-3 sebagai calon induk F-3, serta tingkat keberhasilan produksi benihnya. Pemeliharaan larva dilakukan dalam hatchery hingga larva menjadi benih. Parameter yang diamati meliputi panjang total dan panjang duri sirip larva, berat tubuh larva serta sintasan dan jumlah produksi benih. Hasil penelitian menunjukkan bahwa panjang total larva umur 5, 15, 25 dan 35 hari, masing-masing adalah 3,20±0,07; 4,42±1,11; 8,35±1,12 dan 12,51±3,23 mm. Duri sirip mulai terukur pada larva umur 15 hari. Berat larva umur 30 hari adalah 0,11±0,04 g. Pola pertumbuhan panjang total dan berat tubuh larva adalah eksponensial, sedangkan pola pertumbuhan duri siripnya adalah linier. Masa pemeliharaan larva hingga menjadi benih adalah ± 40 hari. Jumlah benih ikan kerapu bebek F-3 yang diproduksi dalam satu kali siklus pemeliharaan berkisar 440 hingga 2.300 ekor dari 50 ekor induk dan 3 kali siklus pemijahan dengan tingkat kelangsungan hidup 1,30% hingga 8,80%. Hasil penelitian ini mengindikasikan bahwa ikan kerapu bebek F-3 dapat diproduksi dari hasil budidaya seperti halnya pada F-1 dan F-2. ABSTRACTBroodstocks are the most important part of humpback grouper culture, but their availability in nature are limited. Therefore, it is necessary to produce broodstock candidates from culture. The first (F-1) and the second (F-2) generation of humpback grouper have already been produced but the third generation (F-3) production is still on the way. This study was conducted to find out morphological characteristic of the third generation (F-3) of humpback grouper larvae as the candidate of the third generation of broodstock, larval growth and the success rate of seed production. Larvae rearing was done in hatchery until larvae metamorphosed to be seeds. Observed variables including larval total length and spine length, larval body weight, survival rate and the juvenile productions. The study result showed the total length of 5, 15, 25 and 35 days old larvae were 3.20±0.07; 4.42±1.11; 8.35±1.12 and 12.51±3.23 mm, respectively. The spine began measured on 15 days old larvae. The body weight of 30 days old larvae was 0.11±0.04 g. The growth pattern of larval total length and body weight were exponential, while the growth of spine was linear. Rearing period from larvae to juveniles was 40 days. Number of F-3 seed production of humpback grouper produced from once rearing cycle range between 440 and 2,300 fish and the survival rate range from 1.30% up to 8.80%. Therefore, this study could indicate that seed of F-3 humpback grouper can be produced as those of F-1 and F-2.

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Biology and Management of Inland Striped Bass and Hybrid Striped Bass

Biology and Management of Inland Striped Bass and Hybrid Striped Bass ◽

10.47886/9781934874363.ch7 ◽

2013 ◽

Keyword(s):

Dissolved Oxygen ◽

Striped Bass ◽

Warm Season ◽

Apparent Temperature ◽

Fish Mortality ◽

Temperature Sensitive ◽

Hybrid Striped Bass ◽

White Bass ◽

Total Length ◽

Length Range

Abstract.—We compared the habitat selection (temperature and dissolved oxygen) of striped bass (STB) Morone saxatilis and hybrid striped bass (HSB; palmetto bass [male white bass M. chrysops × female striped bass]) in Claytor Lake, Virginia. Striped bass (n = 28) and HSB (n = 33) were implanted with temperature-sensitive radio tags and tracked biweekly for a period of 19 months to record position and habitat use. Striped bass averaged 715 mm total length (range 533–940) whereas HSB averaged 547 mm total length (range 460–659). Habitat separation was most apparent in the warm season months of June through August. During this period, when deoxygenation of the metalimnion and hypolimnion was not limiting, STB and HSB segregated according to apparent temperature preferences, with HSB selecting warmer temperatures. As deoxygenation progressed, HSB and especially STB were forced into warmer strata than preferred. Results from this study suggest that if favorable dissolved oxygen levels are maintained, STB and HSB will vertically segregate during summer stratification. Temperature selection and qualitative observations of fish mortality in summer indicated that adult HSB would be less vulnerable than adult STB to a temperature–dissolved oxygen squeeze in summer and its detrimental effects.

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Length-Weight and Length-Length Relationships in Freshwater Garfish Xenentodon cancila (Ham.) from Muriyadhar, Sunsari, Nepal

Journal of Natural History Museum ◽

10.3126/jnhm.v26i0.14127 ◽

2015 ◽

Vol 26 ◽

pp. 10-14

Author(s):

Bharat Raj Subba ◽

Satya Narayan Mehta ◽

Shaligram Adhikaree

Keyword(s):

Body Weight ◽

Fresh Water ◽

Growth Pattern ◽

Standard Length ◽

Allometric Growth ◽

B Values ◽

Total Length ◽

Length Standard ◽

Length Relationship ◽

Xenentodon Cancila

Present paper attempts to describe length-weight (LW) and total length-standard length (TL and SL) relationships of fresh-water garfi sh Xenentodon cancila. Fish of different length and weight were caught using cast nets from Muriyadhar, Sunsari. The fish were kept in ice box in fresh condition and brought to fi sh laboratory, Department of Zoolog post Graduate Campus, Biratnagar. The data obtained from measurement were analysed using the formula W = aLb. The b values estimated for the total length and standard length in relation to body weight were 3.2202 and 3.2559 respectively. The values of b clearly indicate the allometric growth pattern and for total length and standard length relationship, the linear value of b was 0.3223.J. Nat. Hist. Mus. Vol. 26, 2012: 10-14

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Synchronous changes in length at maturity across four species of Lake Erie fish with different harvest histories

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2019-0408 ◽

2021 ◽

Author(s):

Davíð Gíslason ◽

Robert L. McLaughlin ◽

Beren W Robinson

Keyword(s):

Yellow Perch ◽

Lake Erie ◽

Large Scale ◽

White Perch ◽

Water Levels ◽

White Bass ◽

Morone Chrysops ◽

Harvest Intensity ◽

Ecosystem Changes ◽

Post Hoc

Decreases in size at maturation in harvested fish populations can reduce productivity and resilience. Delineating the causes for these changes in maturation is challenging. We assessed harvest and large-scale ecosystem variability as causes for changes in maturation in four Lake Erie fishes. Regulated harvests of Yellow Perch (Perca flavescens) and Walleye (Sander vitreus) are greater than unregulated harvests of White Perch (Morone americana) and White Bass (Morone chrysops). Our assessment considered cohort data from 1991-2012 for each species. We used a conceptual model of harvest-induced plasticity to show that changes in female length at 50% maturity (L50) were unrelated to harvest intensity in all species. We then demonstrated that changes in female L50 among cohorts were synchronous across species. Post-hoc analysis of variables capturing year-to-year variation in climatic and lake conditions suggested L50 was larger when water levels were near the norm for the study period and smaller at low and high levels. We conclude that changes in L50 were most strongly related to ecosystem changes unrelated to harvest intensity.

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