Age and growth of the yellowbelly threadfin bream Nemipterus bathybius in Kagoshima Bay, southern Japan Speaker: 尤志華 Vladimir PUENTES GRANADA,1 Yasuji.

Slides:



Advertisements
Similar presentations
A Preliminary assessment and management of European hake Murleccius murleccius in the Egyptian coast of Mediterranean.
Advertisements

DEPARTMENT OF PRIMARY INDUSTRY, FISHERIES AND MINES Reproduction.
Sheng-Ping Wang 1,2, Mark Maunder 2, and Alexandre Aires-Da-Silva 2 1.National Taiwan Ocean University 2.Inter-American Tropical Tuna Commission.
Age and growth of Sebastes vulpes in the coastal waters of western Hokkaido, Japan Takeshi SEKIGAWA,ToyomiTAKAHASHI, *Tetsuya TAKATSU,Syuichi NISHIUCHI,
CHAPTER 52 POPULATION ECOLOGY Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section A: Characteristics of Populations 1.Two.
Population Size, Growth, Mortality and Movement Patterns of Yellowtail Snapper (Ocyurus chrysurus) in the U.S. Virgin Islands CRP Funded Project NMF
An Overview of the Key Issues to be Discussed Relating to South African Sardine MARAM International Stock Assessment Workshop 1 st December 2014 Carryn.
Population Ecology Packet #80 Chapter #52.
Age, Size and Growth ZOO 511 week 3 slides. Metrics of Size and Growth Length –PROS: easy, intuitive, history in angling, length rarely shrinks, nonlethal.
Belize National Conch Report 2012
Investigating the Effect of Birth Date on Yellow Perch Mortality via Otolith Analysis Nate Gelinas, Nick Hirsch, Brian Stampfl, Phil Rynish, and Dr. David.
Black Sea Bass – Northern Stock Coastal-Pelagic/ASMFC Working Group Review June 15, 2010.
FMSP stock assessment tools Training Workshop LFDA Theory.
Assessment of red shrimp (Aristeus antennatus) exploited by the Spanish trawl fishery: in the geographical sub-area Balearic Islands (GSA-5) and Northern.
Case Study - Dover Sole Range from Baja California to the Bering Sea. On mud or muddy-sand, at 35 to 1400 m depths. Feed on polychaete worms, shrimp, brittle.
Estimating the Population Size of Razor Clams Using a Model Assisted Sampling Design and Analysis Babineau, D. and Schwarz, C. Department of Mathematics.
The length structure of bigeye tuna and yellowfin tuna catch at different depth layers and temperature ranges: an application to the longline fisheries.
60º Introduction and Background ù The Barents Sea covers an area of about 1.4 x 10 6 km 2, with an average depth of 230 m. ù Climatic variations depend.
R. Sharma*, A. Langley ** M. Herrera*, J. Geehan*
Background  The soft shell clam, Mya arenaria, currently occupies a large geographical range in the northern hemisphere.  Soft shell clams are found.
An analysis of by-catch in the Icelandic blue whiting fishery O´ lafur K. Pa´lsson Curriculum:981 Seminar Name:Yun-Ching Chang School No.:M Date:2009/12/7.
對馬 / 韓國海峽 - 長體蛇鯔的年齡與成長 邱惠君. Introduction Saurida elongata Inhabits sandy-mud bottoms. Depths less than 100m. Japanese trawl fisheries. High meat yield.
A Multi-Agency Effort to Address Declines in Yellow Perch Abundance in Lake Michigan David Clapp Michigan Department of Natural Resources and Yellow Perch.
Population Dynamics Mortality, Growth, and More. Fish Growth Growth of fish is indeterminate Affected by: –Food abundance –Weather –Competition –Other.
Introduction Oithona similis is the most abundant copepod in the Gulf of Alaska, and is a dominant in many ecosystems from the poles to the sub-tropics.
PROGRESS REPORT 1 st SEMESTER (JANUARY – JULY 2014) THE ASSESSMENT ON BLUE SWIMMING CRABS (Portunus pelagicus (Linnaeus, 1758)) FISHERIES IN NORTH COAST.
RA-228 AND RA-226 FROFILES FROM THE NORTHERN SOUTH CHINA SEA Hsiu-Chuan Lin, Yu-Chia Chung and Chi-Ju Lin Institute of Marine Geology and Chemistry, National.
Spatial issues in WCPO stock assessments (bigeye and yellowfin tuna) Simon Hoyle SPC.
Measuring the effects of a seasonal fishing closure on the abundance of Atlantic Cod (Gadus morhua) off the West Coast of Scotland Joanne Clarke 1*, David.
Temporal and Spatial Distribution of Fish Larval Assemblages of the Tebrau Straits South Western Johore Peninsular Malaysia By A. Arshad, Roushon A., S.
UNIT 8: Fisheries assessments. 2 Fisheries data Why do we need fisheries data? FAO (2005): “Information is critical to EAF. It underpins the formulation.
A retrospective investigation of selectivity for Pacific halibut CAPAM Selectivity workshop 14 March, 2013 Ian Stewart & Steve Martell.
Fisheries in the Seas Fish life cycles: Egg/sperm pelagic larvaejuvenile (first non-feeding – critical period – then feeding) (first non-feeding – critical.
Summary Euphausiids (krill) are important food items of fish, seabirds and whales: consequently, it is important to understand their seasonal cycles. The.
Distribution of hard clams (Mercenaria mercenaria) on a remote island in the Great South Bay, NY Ryan Schab Department of Biological Sciences, York College.
ALADYM (Age-Length Based Dynamic Model): a stochastic simulation tool to predict population dynamics and management scenarios using fishery-independent.
Preliminary Data on Euphausiid Distribution and Growth in the Northern Gulf of Alaska. A.I. Pinchuk, R.R. Hopcroft, K.O. Coyle Institute of Marine Science,
GIANNOULAKI M., SOMARAKIS S., MACHIAS A., SIAPATIS A., PAPACONSTANTINOU C. Hellenic Centre for Marine Research, PO Box 2214, Iraklion 71003, Greece Department.
Fisheries 101: Modeling and assessments to achieve sustainability Training Module July 2013.
PCB 3043L - General Ecology Data Analysis.
GROWTH: theory, estimation, and application in fishery stock assessment models Estimating individual growth variability in albacore (Thunnus alaunga) from.
Is there a ‘cryptic biomass’ of relatively old and large red snapper in southeast US continental shelf-break waters?
SEDAR 42: US Gulf of Mexico Red grouper assessment Review Workshop Introduction SEFSC July , 2015.
1 Federal Research Centre for Fisheries Institute for Sea Fisheries, Hamburg Hans-Joachim Rätz Josep Lloret Institut de Ciències del Mar, Barcelona Long-term.
Determining the Age of the Raja radiata Garmen. Citation [internet]. Thorny Skate. Raja radiata Donovan
Chilean fleet operations on the jack mackerel fishery 2004 Document prepared for the Third Bilateral Consultation on Fisheries Conservation between the.
Yellowfin Tuna Major Changes Catch, effort, and length-frequency data for the surface fisheries have been updated to include new data for 2005.
PARTICIPANTS NCMR (Responsible Institute), IMBC [Greece] IREPA[Italy] U. Barcelona, U. Basque, UPO[Spain] EFIMAS MEETING NICOSIA CRETE 2004 APRIL
MONTE CARLO SIMULATION MODEL. Monte carlo simulation model Computer based technique length frequency samples are used for the model. In addition randomly.
Data requirement of stock assessment. Data used in stock assessments can be classified as fishery-dependent data or fishery-independent data. Fishery-dependent.
SAMPLING TECHNIQUES N. JAYAKUMAR Assistant professor Dept. of Fisheries Biology and Resource Management Fisheries college & Research Institute, Thoothukudi-8.
DETERMINATION OF GROWTH PARAMETERS. Introduction Growth parameters are used as input data in the estimation of mortality parameters and in yield / recruit.
Reproductive adaptations of haarder (Liza haematocheila) to the new environment of the Russian South Seas Svetlana Pianova Federal Research Institute of.
Population Dynamics and Stock Assessment of Red King Crab in Bristol Bay, Alaska Jie Zheng Alaska Department of Fish and Game Juneau, Alaska, USA.
Fishing grounds a) for trawlers: m in depth, but mainly m b) For boat seines: shallow waters up to 50 m in depth In the Gulf also purse.
PRINCIPLES OF STOCK ASSESSMENT. Aims of stock assessment The overall aim of fisheries science is to provide information to managers on the state and life.
BIOLOGI DAN HARVEST STRATEGY PERIKANAN RAJUNGAN DI LAUT JAWA
Life History of the Knobbed Whelk, Busycon carica, in Georgia
Nancy J. Brown-Peterson1, James R
Matthew Donaldson , and J. Read Hendon
New insights on Reproductive strategy of swordfish (Xiphias gladius)
Ryuji Yukami‧Seiji Ohshimo‧Mari Yoda‧Yoshiaki Hiyama
Preliminary Assessment of the Age, Growth, & Reproduction of Sheepshead, Archosargus probatocephalus in the Mississippi Sound and Adjacent Waters J. Read.
Morgan M. Corey1, Nancy J. Brown-Peterson2, Robert T. Leaf1, Samuel D
C5 Population Ecology National geographic celebrates 7 billionth person on October 31, 2011 Need 1.5 Earths to support current growing population 19th.
THEORY OF LIFE TABLES N. JAYAKUMAR Assistant professor
AGE DETERMINATION – INTEGRATED METHOD
Characteristics of mixed stock
Volume 21, Issue 18, Pages (September 2011)
Methods of Age Determination using Length Frequency Method
Presentation transcript:

Age and growth of the yellowbelly threadfin bream Nemipterus bathybius in Kagoshima Bay, southern Japan Speaker: 尤志華 Vladimir PUENTES GRANADA,1 Yasuji MASUDA,2* AND Tatsuro MATSUOKA 2

INTRODUCTION The threadfin breams of the genus Nemipterus are widespread throughout the tropical and subtropical Indo-West Pacific region and more than 20 species are recognized. They are small to moderate sized fishes and most inhabit shallow sand or mud bottoms, and are taken commercially by hook-and-line and bottom trawl.

Many biological studies have been done for the genus Nemipterus. Eggleston studied the fisheries biology of some nemipterid fishes in Hong Kong. Russell summarized the diagnostic morphology, geographic distribution, habitat and general biology of nemipterid fishes of the world. Young and Martin examined the sex ratios and hermaphroditism in nemipterid fishes from northern Australia. Lau and Sadovy studied the gonad structure and sexual pattern in two threadfin breams and possible function of the dorsal accessory duct.

The age and growth parameters of the following species have been examined: N. peronii from the north-west shelf of Australia using otoliths. N. peronii on the east coast of peninsular Malaysia by length frequency analysis. N. japonicus in the north-west continental shelf of India by length frequency analysis. N. japonicus off Kuwait using otoliths. N. virgatus off Fukuoka, Japan by scale reading. N. virgatus from the East and South China Seas using otoliths. N. furcosus from north-west Australia using otoliths and length frequency analysis. For N. peronii and N. japonicus total or natural mortality were also estimated, and for N. peronii the stock status and management scheme were proposed.

Nemipterus bathybius Nemipterus virgatus Nemipterus peronii Nemipterus furcosus Nemipterus japonicus

In Kagoshima Bay, N. bathybius in the entire bay and N. virgatus in the entrance area of the bay. Of these two species, N. bathybius is captured in large quantities by fishing gear such as Danish seine, longline, gill net, and hook-and-line in Kagoshima Bay, and proper stock management is needed. There are many sources of information on the age and growth of N. virgatus as described above, but very little for N. bathybius.

MATERIALS AND METHODS A total of 1818 specimens (536 males and 1282 females) of N. bathybius were collected at Iwamoto Fishermen’s Cooperative (IFC), Ibusuki city and Kagoshima fish market, Kagoshima city, Japan, from April 1998 to November Samples from the IFC were mostly from Danish seine catches, while those from the Kagoshima fish market were from longline or gill net, all being caught at depths less than 100 m (Fig. 1).

Fork length (FL) and body weight (BW) were measured to the nearest millimeter and to the nearest gram for every fish sampled. Gonads were also measured to the nearest 0.01 g (GW) and then preserved in Bouin’s solution for subsequent histological observations. Sex was checked by the naked eye or by microscope. Gonadosomatic index (GSI) was calculated as follows:

Based on preliminary observations of both scales and otoliths (sagittae), sectioned otoliths revealed clear ring marks as shown in Fig. 2

Otoliths of 1563 fish specimens were embedded in epoxy resin, cut with a microcutter and polished using a grinder in order to make transverse sections crossing the focus, leaving a thin slice of approximately 0.2 mm thick, and mounted on a glass slide and coated with nail enamel.

The number of ring marks (outer edge of opaque zone) on sectioned otoliths was counted by two readers using microscope with transmitted light under a black background at 40 * magnification. Otoliths difficult to read were taken out; then, if there was an agreement between both readers, the resulting counts of the ring marks were adopted.

Distances from the focus to the outer edge of each opaque zone (ring radius, ri) and to the periphery of the otolith (otolith radius, R ) were measured with the built-in micrometer of the microscope along the dorsal tip of sulcus acusticus (Fig. 3)

The marginal growth increment (MGI) is expressed as the following equation and was used to establish the period of ring formation: Where R is the otolith radius, rn is the distance from the focus to the outer edge of outermost opaque zone, and rn –1 is the distance from the focus to the outer edge of the immediately preceding opaquezone.

The following three growth models (von Bertalanffy, Gompertz and Logistic) in terms of length were used for the analysis: In terms of weight, the following von Bertalanffy growth model was used:

The best fitting model was selected on the basis of the AIC values where n is the number of specimens used for the analysis, Ymin is the minimum value of the residual sum of squares, and p is the number of estimated parameters.

RESULTS Length frequency distribution Ring formation period Fork length–otolith radius relationship Growth

Length frequency distribution Males (N = 536) were significantly larger than females (N = 1282) in fork length (FL) (Mann–Whitney U-test, P < 0.01; Fig. 4). Length frequency distributions clearly showed differences in the range of sizes between sexes: most females ranged from 130 to 210 mm FL and males from 140 to 260 mm FL.

Ring formation period In male N. bathybius (Fig. 5), the ring formation period was from May to July in the one-ring group, June to July in the tworing group, August in the three-ring group, June to August in the four-ring group, and August in the five- to seven-ring group. In females, (Fig. 6), ring formation period in each ring group also ranged from May to August, indicating that ring marks were formed once a year during these months.

Figure 7 shows the monthly changes in gonadosomatic index (GSI) by sex. For both sexes GSI started to increase from May, and maintained high values from July to September, then dropped in October. This trend was notable for females and the spawning season of N. bathybius was considered to be from May to October, with a peak occurring during July to September in Kagoshima Bay. The MGI analysis showed that the ring formation season was from May to August, corresponding to the early spawning season.

Fork length–otolith radius relationship The fork length (FL, mm)–otolith radius (R, mm) relationship for each sex was represented by the following equations (Fig. 8):

Growth In all models, growth of males and females significantly differed in the residual sum of squares (P < 0.01), male being bigger than female. The minimum value of AIC was found in the von Bertalanffy model, for both males and females and for both length-at-age and weight-at-age data, showing the best fitting of the curves (Figs 9,10).

DISCUSSION Preliminarily, we examined the suitability of scale and/or otolith of N. bathybius for age determination. Clear age marks were observed in otoliths (Fig. 2), but not in scales.

As shown in Table 1, the lengths of N. bathybius in Kagoshima Bay seem to be bigger than those in Hong Kong3 at each age.

Size differences in females are around 10 mm, except at 3 years of age in which mean lengths are quite similar. These differences in size in both regions may be caused by ecological differences, such as an abundance of N. bathybius itself and/or their prey or predator species, or by artificial differences such as fishing intensity, or by genetic differences between local populations. To clarify this, further studies on these factors may be needed.

The von Bertalanffy growth model showed the best fit among the three models. In terms of length (Fig. 9), males grew gradually from 1 to 8 years of age and fitted well to the curve, as did females of more than about 2 years of age, although growth was very slow. To clarify whether these factors have an effect on size disparity or not: (i) differential mortalities between sexes (ii) differential migration or spatial segregation by sex (iii) size-biased selectivity in fishing methods.

Differences in longevity between sexes may be explained by the following factors, but it is still unclear at present which has a predominant effect: intrinsic factors, such as a high natural mortality in males caused by a more energetic consumption in reproductive strategy, like male–male competition. extrinsic factors, such as a high fishing mortality in large males caused by fishing gear selectivity or a high natural mortality in large males through predation.

THANK YOU