Fisheries level-2; semester-2 FMG-203 [Fish Population Dynamics] Quesion 2014-2018

 

 

 


 

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 Fisheries level-2; semester-2 FMG-203 [Fish Population Dynamics] Quesion 2014-2018

 

 

 

 

 

 

 

 Hajee Mohammad Danesh Science and Technology University, Dinajpur

B. Sc. Fisheries (Hons.) Level 2 Semester II (July-December) Final Examination 2016

Course Title: Fish Population Dynamics-11

Course Code: FMG 203; Credit Hours: 3.0

Full Marks: 90

Time 3 Hrs

The figures in the right margin indicate the marks for respective questions.

Give diagram (s) where necessary.

Split answering of any question is unacceptable.

Use separate answer script for answering of each section..

Section A Answer any 5

5x9-45

1. a) Define population, stock, unit stock, CPUE and fish population dynamics.

b) Why is fish population dynamics important to study in fisheries science?

4

2

2. a) Explain the equation, Y=a+bX.

b) Why is length data mostly used to measure the growth of fish in sea? c) The carapace length (mm) and total length (mm) for the Penaeid prawn are given in the

following table, Show the relationship by using the data and comment on the growth of

the Penacid prawn population.

2

Carapace length (mm) 21 18 26 32 39 43 52 58 62 Total length (mm) 95 87 105 135 145 175 187 209 223

3.

a) What are absolute abundance and relative abundance of fish? Discuss briefly. b) A depletion experiment using traps on an isolated 25 km stock of crabs was run over 8 weeks. The number of crabs caught and the number of traps used per week are shown in

the following table. Estimate the initial exploitable stock size of crabs.

5

6

8

Week

1 2 3 4 142

Traps

190

197

212

Catch 1335 1935 2125 2532 1870 2212 1432 938

7

195

188

209 235

2 2

4. a) What are meant by length-weight and length-length relationship?

b) Write the assumptions of the Peterson method.

c) An experiment was conducted to estimate stock abundance of Tilapia population at HSTU campus. At first 120 fish were sampled to cut their caudal fin and released in the pond. After a certain period of time sampling was done and a catch of 96 individuals including 12 tagged fish was found. Calculate the stock size of the Tilapia population at 95% confidence interval. Use t 1.96.

5. a) Define cohort and pseudo-cohort.

b) What are the advantages of fast growth rate of fish? c) How will you derive von Bertalanffy growth (single and multiple samples) equation to estimate growth parameters of fish?

2 2 S

2

6. a) What are marking and tagging of fish?

b) Write the objectives of marking and tagging of fish. c) Describe the methods used for group marking of fish.

3

4

7. Write short notes of the following

a) Lea's formula

b) Depletion method

9

(3x3

c) Selectivity of fishing gear